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1900 Series Service Manual

1. 14 Printer 300 200 56 Lamp Replacement 16 Printer Interface PCB 300 200 57 Filter 18 Incubation block PCB 58 Filter bel 52 nte 20 Printer Jams 21 Printer Repairs 22 Print Head Replacement 22 Printer Platen Replacement 24 Printer Interface Replacement 25 Main PCB and or Photometer Replacement 26 Calibration 30 Software or Hardware Calibration 30 Software Calibration 32 Restore Calibration Data 33 Reset Calibration Data 34 Software Calibration Temperature 35 Software Calibration Absorbance 36 Hardware Calibration 37 Hardware Calibration Temperature 37 Hardware Calibration Absorbance 39 9 1994 2000 Awareness Technology Inc Unauthorized duplication is prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair service No part of this manual may be copied or redistributed without the express consent of Awareness Technology Inc There is
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5. XX6L rvice Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted 1900 Series Se for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 52 Rev E Draft Main PCB from rev Z 2 of 4 SHT 2 4 in z lt E oa 2 pz I 2 x 5 EXPRESSLY PROHIBITED vo gt zZz C gt gt gt e I lt ud e 2 zZ oO lt lt gt lt gt lt ILI lt lt l e DESCRIPTION 280 CPU EPROM MK48T08 8254 POWER SUPPLY 5 232 ul U2 e z a amp KEYBOARD DG RN5 1K NOTE DIGITAL GROUND CONNECTS TO ANALOG GND AT THIS POINT BRIDGEBA TO 8255 KEYBOARD INTERFACE INTERFACE 05 10 Pf POWER SUPPLY RS 232 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 53 Rev E Draft Main PCB from rev Z 3 of 4
6. 26 Rev E Draft RIGHT SIDE STS S 66666 0 pr J LEFT SIDE Figure 14 Printer Views for Print Head Replacement 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 27 Printer Platen Replacement 1 Referring to Figure 15 remove the Paper Dress Panel 2 Move the Print Head to the right most position as shown by rotating the Screw Drive with its drive gear on the right side of the mechanism 3 Lift out the left side of the platen 4 Install the new platen so that the end which has the longer pin is oriented toward the right sideofthe mechanism Insert the right end ofthe platen under the print head Use a pen point or similar blunt instrument to push metal spring slightly forward then slip the left side of platen in place Dress Cover Figure 15 Printer Platen Replacement 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 28 Rev E Draft Pri
7. 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 35 Software Calibration Calibration data are entered at the keypad and are stored in nonvolatile memory with a checksum that is recalculated and compared each time the instrument is powered on a new software mode is selected ora stored test is recalled Failure to recover the calibration data properly checksum failure will be indicated on the display and the internal printer DO ABS SET TEST 212 DO TEMP SET TEST 210 If either of these messages are printed or displayed it indicates that the calibration values have been lost These messages will be printed each time the checksum failure occurs and until calibration is performed The instrument also annunciates this condition with multiple beeps The absorbance calibration data is stored as a scaling factor which is the ratio of a known reference absorbance to the instrument s reported absorbance The value entered at the keypad is multiplied by the stored value to obtain a new scaling factor The temperature calibration data is stored as offsets which the instrument adds to the sensed temperatures The value entered at the keypad is added to the stored offset to produce a net adjust
8. is manual d rep h iding routine instrument maintenance an tion given int d Informa ibite ictly proh ication 15 str 1900 Series Service Manual for use by authorized personnel and is to be used for the sole purpose of prov 1994 1997 Awareness Technology Inc Unauthorized dupl 45 Rev E Draft PCB Layouts Main PCB from rev Z 3015 dNOI NON TIVISNI LON LY AONAR AWARFNESS TECHNO nie Mr 300 100 6f 5 5 200466 8424 0061 8v001 00 4 90310NH 31 SCUINIMW M V 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 46 Main PCB from rev L to rev Y w gt ce bun ae 132205 I RE s no ONY ENS ED 5 305 4 02 27 305 9405 81n ozn 132058 ON SW amp ore 1401 133205 37 pe gh Ss NU ee 5 13X905 un uo o E 200666 824 0061 YY A001 00 SSANSYUVMY 1900 Series Service Manual 1994 1997 Awareness Tec
9. 0 m jan 1 f 9d 4 c0 Sn LAYI 1 z len e en i kto yi az zn anv YEOOZNIN 4889150 ee OND he ee 3070H 1132 531835 0061 st O31lgid0dd A15S38dX3 S NO Q32Zils0HinvNn v T 1HS ALI XX6L 820d A9010NHOd31 SSJ3N3SVAMV jAldd OLInOSON SU3AIJQ 5 43MOd id gt 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 57 Rev E Draft Main PCB rev L to rev Y 3 of 4 WU ie Wen lt dd OEE Edl Si gt ZN neY arin 79 CL Si ie COSI VS Sy 913 gt ango 377 AOS Ig S Y eza 512 LOVPNZ 3 9907 oE x32 S et 171 Y RES 5 Du k YEOOZNIN 9 51 2 e E s Oi p i ia 2 4 ra t 35 5 31 y I zin AER 12 14062 CED pe 1132 794 32018 N13 gr 301 D UAE Wi anggo VINY BENY 022 OONY
10. Right front gear Print head shaft Print head moves print head Figure 12 Clearing printer jams 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 25 Printer Repairs A graphics capable printer has been introduced in recent instruments Replacement printers are graphics capable and can be made compatible with earlier non graphics capable printer PCBs One way to identify which type of printer is used is to remove the ribbon cable from the keytail socket on the printer interface PCB Look at the connector on the ribbon cable An earlier non graphics capable printer will have eight conductors The graphics capable printer will have nine Another way to identify which printer is used is to look at the blue inspection label on the printer interface PCB Ifthe number on the label is 20445 or higher a graphics capable printer is used Repairs to printer mechanisms can consist of print head replacement or printer mechanism replacement Print Head Replacement Replacement Print Heads are supplied for the graphics capable printer nine conductor ribbon cable Determine the size of the keytail socket on the Printer Interface PCB into which the ribbon cable from the Print Head being re
11. The spot should be small and centered on the aperture The spot should be sufficiently large to just encircle the aperture If the spot is not centered repeat step 4 Insert a borosilicate tube filled with plain water into the read well Do not use a soda lime glass tube since it does not transmit at 340 nm Select test 186 The instrument prints the detected voltage for each filter position All voltages should be between 2 00 volts and 10 00 volts If all the voltages report low repeat step 5 until optimum lamp position is obtained 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 20 Rev E Draft Lamp Lamp must be parallel bracket Lamp with lamp bracket Lamp filament must be centered Spring plate Lamp terminal vertically and horizontally on lens screws Figure 8 Lamp Replacement Use screw to adjust height of lamp Figure Lamp Alignment with Newer Lamp Bracket Spot should be small and centered aperture Figure 9 Spot Alignment 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and i
12. 1 i 1 gt c ur 2 2 1 123130 1 1 1 1 1 1 1 1 1 1 vog i S031 BI 1 1 1 I Pu DER ee 1 1 Bee i i 2v 8 i 1 i 1 A 60 8 824 Nag 038 mE 197 61 1 11 i i OIA 918 LV3H 1132 E a aes a ee et ce ee at 24 G3ilgldQNd 4155244 3 S NOW VOITENG CIZIYOHLNYNNA LHS A XX8l 89d 49010NH231 SS3N3NYMY vile c ur i ur 395 YOU 82d 01 did Nid 21778 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 59 Printer PCB 300 200E nies 9 19 40K HOME RNI C2 PIC16C57 2MHZ 0 74HC373 G p 300 200 184108 C 1997 AWARENESS TECHNOLOGY 300 200E PRINTER INTERFACE P N 184108E ORG 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and i
13. A typical mercury bulb or other glass thermometer adds a great deal of thermal mass to the system as well as provides a conduction path for heat thereby frustrating the instrument s heating capability Materials and equipment e 2 12 mm borosilicate tube or other cuvette appropriate for the instrument 2 Reference thermistor probe YSI Inc 44108 or equivalent 30K 25 C 0 2 interchangeability Digital ohmmeter DMM 0 5 or better accuracy Procedure 1 Place a tube or cuvette filled with 1 ml of water into the incubation block Suspend the reference thermistor probe in the approximate center of the tube Do not allow the probe tip to touch the tube wall Place a similar arrangement into the cell 2 Press the LAMP key to turn on the lamp Allow 15 minutes for equilibration 3 Set the DMM to read 20K Read the resistance of the thermistors If the resistance is between 17994 and 18435 no adjustments are needed Otherwise continue to the next step 4 Refer to Figures 19 and 20 Adjust the trimpot s by a small amount Turn it clockwise to lower the temperature counterclockwise to raise the temperature TP4 adjusts the cell temperature TP1 adjusts the incubation block temperature 5 Repeat steps 2 through 4 until the resistances of the probes are within range You should attempt to get the resistance to read as close to 18210 y as possible 1900 Series Service Manual 1994 1997 Awareness Technolog
14. The instrument is based on the 8 bit 2 MHz Z80 microprocessor U1 The software is permanently stored in an EPROM U2 In most instruments a battery backed nonvolatile RAM random access memory chip U3 incorporating a real time clock is used to store data such as calibration test setups samples and also maintains the date and time Some instruments use the 6264 static RAM U22 in addition to the nonvolatile RAM for RAM functions that need not be maintained at power off Most digital I O is accomplished with 8255 PPI U5 Time intervals and pulse widths are measured using the counter channels of 8254 timer U4 WARNING Hazardous line voltages are present on the rear panel and beneath the incubation block Always disconnect the external AC power cable before opening the instrument CAUTION Do not make any hardware adjustments until you have read the section Calibration 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 11 Rev E Draft Buom SI SHA peisn pe dwel 51 SHA seDeyoA IM 51 eoejde ON ded S3A SHA SHA ON
15. Un eaae itr ted 183354 POB PE 995003 Battery RAM chip 32 202029 ete bti e icis ds qu ete Ote Vei eue 163061 Belt filter wheel eres tested EHE 132059 Motor filter wheel nii EGns b REDE enu PS 105126 Photonieter assy NEUEN I LU INN IURE raa specify model Reaction block as8V ERO e ERU OU E QUI SI ete REA p eae AQUIS specify model specify model TVS LE 104502 Internal 14 pin cable specify length 2 2251 104xxx Priritet mechamsm ce ed ache adhe 105601 M UE 105651 Print Head includes printer 1 pet 105652 Printer uierface Po Bas 995006 Display 25559 162519 Filter amp Neutral replacement set 53a specify wavelength 111XXX Specify the instrument serial number when ordering so that replacement part compatibility issues can be addressed 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument
16. ation Rotation Home Index hole hole Figure 11 Filter Wheel Positions 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 24 Rev E Draft Printer Jams CAUTION Do not apply force to the print head Do not scratch the platen or pry with sharp objects If the instrument displays Printer is jammed or if the print head does not return to the home position check for obstructions in the print head path Refer to Figure 12 Clearing printer jams Carefully remove any paper or debris with a pair of tweezers Turn off the power switch wait 5 seconds then turn on the power switch The print head should move to the right side and then return to home position at the left An alternate method of removing a particularly stubborn wad of paper is to move the print head manually To do this open the instrument Remove the two nuts holding the printer bracket to the cover View the front of the printer mechanism Locate the small gear on the right side which turns the grooved steel print head shaft Turn the gear so that the print head moves away from paper wad and the paper can be easily removed Home position Print head is jammed against wad of paper p TE
17. jueseid AG 4 10 ueje d pue peeu Jud jaded 1ejuud Y29949 S3A 4 e qeo 1ejuud 5 ON OCGA 10 jaded 2 5 v ON god loud uo 91 49949 GIN 9 vim euo 8f er ye suid yoayD Auy SHA 51 000 pee Jaded Lp 1e fe dsip Y93949 spJepuejs Aja ON lenba seDeyoA 141 2 98 150 109 95 eqni 158 1959 SHA sd g e e qeo sseJd pedfay yoyo ON Figure 5 Troubleshooting 1900 Series Service Manual SHA sindino ON SSA smoys ON 1 NO yous 195 pajjeysul Jaded je3uud AjueA uoiiws 199Jes peioeuuoo ejqeo 19715 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument
18. maintenance and repair services 12 Rev E Draft Troubleshooting The flowchart in Figure 5 describes the logical steps to take if the instrument is malfunctioning It is only a guide to troubleshooting and is intended to assist in determining problems which are routine It is not intended to take the place of an experienced technician nor does it attempt to cover all possible problems Note for example that the temperature control system is not covered In the following section each subassembly or component group and possible problems and solutions are outlined Power Supply The power supply consists of a transformer two diode bridges and three regulators Line voltage supplied to the transformer is converted to 36 VAC center tapped which feeds diode bridge BR2 The center tap is used as a reference for regulators VR4 and VRS which provide 15 VDC and 15 VDC for analog circuitry Another transformer output supplies 11 VAC to diode bridge BR1 which in turn provides 12 VDC raw 11 13 VDC nominal to the system and VR3 regulates this down to 5 VDC for the logic and other low voltage control circuits WARNING Hazardous line voltages are present on the rear panel and beneath the incubation block Always disconnect the AC power cable before opening the instrument A dead instrument may be caused by just a blown fuse However a blown fuse may indicate a problem on the main PCB or transformer Also the voltage select swit
19. no transfer of technology copyright trade name patent trade secret or other proprietary right given or implied Rev E 8 00
20. rps under software control Aseach filter passes in front ofthe photodetector an infrared optical switch generates a pulse FCNT atU13 C14 chargestothe peak voltage produced by the photodetector and amplifiers U16 and The sampled voltage is buffered by U15A and then fed to comparator U15B which compares the sampled voltage to the output of an exponential capacitor decay circuit built around Q3 and C16 The positive voltage at the comparator output enables a counter in 8254 timer U4 The photodetector output is proportional to the intensity of the light whereas the width of the positive phase of the comparator output is proportional to the absorbance An oscilloscope can be used to view the important signals at connector J8 while the instrument is in operation See Figure 5 Oscilloscope Waveforms Display Keypad and Printer A 16 character alphanumeric LED display is mounted to the printer bracket inside the cover The display connects to the Z80 data and address buses on the main PCB via a 14 pin DIP cable which also supplies 5VDC power A 4 x 4 membrane switch keypad is sealed behind the front panel overlay The tail of the keypad switch layer is fed through the cover and installed to connector K1 on the main PCB which then connects to 8255 PPI U5 The printer assembly which consists of a 20 column thermal printer printer PCB and metal support is mounted to the cover and is connected to the main PCB viaa 14 pin DIP cable which provide
21. 0 0 CELL 0 0 2 Ifthe data printed in step 1 did not match the example stop Complete the procedure Reset Calibration Data then repeat this procedure Otherwise locate the calibration data label on the underside of the instrument Copy the data from the label for reference in the following steps 3 Ifthe date and time are incorrect set the date and time as described the Owner s Manual 4 Select test 210 The display shows BLOCK Enter the value from the Block Temp line on the calibration label 5 display shows CELL Enter the data from the Cell Temp line of the calibration label 6 Select test 212 The display shows ABS FACTOR Enter the number from the Abs Factor line of the calibration label 7 Select test 213 to print the calibration data The printed data should now match the values shown on the calibration data label If it does not complete the procedure Reset Calibration Data then repeat this procedure 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 37 Reset Calibration Data This procedure resets the calibration data The absorbance scaling factor is set to 1 000 and the temperature offsets are set to 0 0 Procedure 1 Selec
22. 2 conductor cable and SIP header AC mains components are mounted on the chassis Three 18 AWG wires feed 115 with ground to the incubation block heat PCB Note that the incubation block itself is tied directly to this ground wire The EPROM is located beneath a hatch on the underside of the instrument to facilitate easy software upgrades Early models which do not incorporate the EPROM hatch require the removal of the cover for software upgrade CAUTION The block heat PCB beneath the incubation block is connected to the mains supply Disconnect AC power cable before servicing 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 3 Your particular 1900 series instrument may differ from the configuration described in this manual To describe each instrument model in detail would be impossible due to space limitations Omitted features may be ignored Differences which affect calibration or service procedures are noted where applicable 1900 series variations e 4 position filter wheel e Incubation block omitted e Photometer read well not temperature controlled e Block and photometer accept 13 mm 15 mm or other tubes or cuvettes e Thermal print
23. Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 50 Rev E Draft Incubation Block PCB 1 5Ky 10W 220 Q201E3 or 97A6 1 5K 10W 1 LED MCP3021 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 51 Rev E Draft ICS Schemat Main PCB A7SS3HdX3 SI Q3ZiuOHinvNn 338 39 4130 an Quv08A3 014 184 5 929 8018 21547 01615 901vNv SLIOA S 7 002 006 JO 82d TVNYIHL OL YIOHvZ EV 1353 10 92 n 90 0458 25 8 z 7 tO 3015 4 02 NO 504 11 8 vOv EOY soy y voy 509 3ezn oov 609 rior S0v tov cov 10 00v from rev Z 1 of 4 S018v N en G1 001V XX61 8700 002 2824 SSINSYVMY 4 010 61 001 61 001 V 1HS YOSSJIOUdOYIIN JILVWAHOS 82d
24. OWY u er t 3WOH i i azz IZNY i Af 1 dd YIOHtZ id CH lt 7 T lt 7 i i TET 6r d wun wee tal i 1 WIES CASE AG 1 1 i ZN anezo ESLT i 21 67 3 5 96 i oun ay esgan lt 9 7 lt i TELS i 1 aues 3 1 1 pop a uy i tg wen IYJ i uS ET i me 3 6 i 1 i 5 asin if 1 9 4350 10N AOG jn AOS 1 A YEOOZNIN 1 i go o 19 gr P920 CRT x 2 990 a c e gt x REG 6 7 4 on Sv a 1 VEODZNIN vlOHv FD ERE eig 3 H Neo INOS a z Bozn Aun AS i E i 2 ara Y E a 313 5 1 Ded 3Wnvs j N n zn se n ron vozn siz 1132 f esr way padu 1153130 cam 2 Jan NM 24714 gt N 14 QNZ n ae V9NH 17280 dW3l 8 922 0918 THM 1004 i 1Nn02 lt 2 F 7 1 wads 2 RR cce 43 901 VNY 3 vrin 9 i 29001 i CASE S 1 1 1 1 1 1 1 1 LSr t t LHS XX61 8v00L 00 83 M3138010Hd 011 did 1900 Series Service Manual 1994 1997 Aw
25. Rev E Draft 1 Introduction This manual describes service and troubleshooting procedures for 1900 series instruments This manual is written with the service technician in mind and contains no information for clinical chemistry analysis or other applications For details on instrument operation and specifications please refer to the Owner s Manual specific to the instrument The 1900 series instrument is a general purpose microprocessor controlled bichromatic photometer system In the standard configuration the instrument 15 equipped with six optical filters and 37 incubation accepts standard 12 mm round tubes and includes an incubation block with 12 round tube stations Both the incubation block and the read well are temperature controlled to 37 C An internal thermal printer provides a printed record of all samples and test parameters All calibration data test parameters and other information is stored in battery backed nonvolatile RAM An aspirating flowcell with control module is available as an accessory WARNING Hazardous line voltages are present on the rear panel and beneath the incubation block Always disconnect the external AC power cable before opening the instrument 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose o
26. areness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 55 Rev E Draft OSTR 14 010 0057 4 g 5 338 32 1330 5 9 ra CDD FRYN WHOIS 2 aon gt a aa imm sie amo o 9m 9 Y 1 rw TOY lise s dcm t8 oa y 0057 vel 0057 eee core E 66157 1 990 Av3dSIQ T e 009 apy 5 E ror 5 5 CR 205 gt HEEN at hu 77 oe CIS d D lt 50 1 Hoy a SA oo FA Bye Ove Gee ov Cm EN rol ZA 0 9 00 1 LERNTE capa E DUE si v eiz Tov i 5 T 990 i 5 Es e NES ING 9 e DAR ser iMm w T TO pope agn r ioHtL Du e uv 80 8 XN 0 43 ETY oo c S 087 v 10 C zi 2 cote so ousa gt N 2 gt 30 HS di en 25 roy 0 558 25 gt 50 8 20 vH Opi a 10 0 Gly 60 gov Hf 1 18 E 4 109 z
27. be filled with plain water into the read well Do not use a soda lime glass tube since it does not transmit at 340 nm Select test 186 and confirm that all of the detected filter voltages are between 2 00 and 10 00 volts Determine the absorbance of both the 1 1 reference material and the 1 2 dilution on a reference spectrophotometer The 1 2 dilution should bein the range of 8 to 1 2 absorbance The 1 1 material should be in the range of 1 6 to 2 4 absorbance Select the absorbance mode Press ABS Select the required wavelengths Select 0 for no differential filter Blank on the same diluent material used to prepare the concentrations Read the 1 2 dilution Divide the absorbance as read on the reference spectrophotometer by the reported absorbance value Note the result of this calculation for the next step Exit the absorbance mode and select test 212 The display shows ABS FACTOR Enter the result of the calculation performed in the preceding step When this factor is entered the instrument will multiply by the old factor and display a net factor the new calibration data Select the absorbance mode again Blank as before on the diluent The 1 2 dilution absorbance should now agree with the reference to within 005 absorbance Read the 1 1 concentration It should agree within 2 of the reference If necessary carefully adjust trimpot TP3 to achieve this agreement Read the section Hardware Calibration before making any adj
28. cable in the same way Disconnect the keypad cable from its connector Remove the cover and set it aside To reinstall the cover reverse the procedure Position the cover on its side to the right of the chassis base Connect the printer display and keyboard cables Carefully fit the cover to the chassis base Install the cover screws Do not overtighten the cover screws WARNING Hazardous line voltages are present on the rear panel and beneath the incubation block Always disconnect the AC power cable before opening the instrument 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 18 Rev E Draft gt S 22 2 9 3 S gt ea A S ee a 2 3 A m c Figure 7 Cover Connections 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 19 Lamp Replacement The lamp should be replaced only if it fails to l
29. ch setting must match the line voltage If there is no input voltage present at J6 check the fuse To replace the fuse disconnect the power cable and open the instrument Locate the double clip fuse holder mounted on the inside of the rear panel Locate the blown fuse and remove it with a fuse puller or carefully pry it out with a small screwdriver Install two 2 0 6 A 3AG slow blow fuse Replace only with fuse of the specified type and current ratings If voltage is present at J6 check for input voltage on VR3 VR4 and VRS If no voltage is present the diode bridge BR1 or BR2 may have failed Photometer The photometer assembly can be examined as several component systems Read well assembly and cell heat PCB Lamp and brackets Photometer PCB Filter wheel and motor The read well assembly serves to hold the tube centered on the cell block between a fixed plate and a spring loaded plate A microswitch mounted to the cell heat PCB operates when a tube is inserted 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 13 The lamp is tungsten halogen rated at 6V 10W The lamp bracket holds the lamp and lens in alignment with the rest of the assembly that is
30. concentration The reported absorbance should agree within 2 005 of the reference If not adjust trimpot a small amount clockwise to increase the value counterclockwise to reduce the value Repeat this step as needed until the reported absorbance is within limits Repeat steps 2 through 7 until all three criteria are met filter voltages low absorbance gain and high absorbance offset 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 43 Replacement Parts Consumable Items and Accessories E 112004 FUSES Dv NS estet 102002 Printer paper 5 TOllgy i oido ect a SEU Ursi s sae to 150001 Carrying CASE E A ANE 000390 12x75 mm borosilicate tubes 250 box 1000 2200000000001 157302 D st 001990 Nonconsumable Items bei ua ug ape ts 183103 Keypad domed teens tues ate 183113 Keypad overlay assembly 3 e
31. device which prints ASCII characters using a 5 x 7 dot matrix Graphics printers use 5 x 8 dot matrix with the extra bit used only in graphics mode A printer PCB incorporating a microcontroller manages the print head motor and the head drivers There are no adjustments and service is limited to replacement of the entire printer mechanism A printer jam can occur if the printer paper tears and becomes lodged in the printer mechanism thus preventing the print head from moving freely Refer to the section Printer Jams Display The display should be clearly legible with no missing or dim characters or segments There are no adjustments and service is limited to replacement Keypad The keypad is a sealed membrane switch layer which is serviceable only by replacement You can test the keypad by pressing AUX then pressing all keys except CLEAR and ENTER Note that each key causes the instrument to beep and display a character Press CLEAR and the display clears Press ENTER to end the test Serial Port The serial port is intended for use with either the aspirating flowcell accessory or with an external serial printer Early models only support a serial printer By using a special cable a serial printer or computer with a serial port may be connected The port is a female 9 pin DB style connector using RS 232 signals in a nonstandard pinout The data formatis 2400 baud 8 bits 1 stop bit and no parity There are two different pinouts for t
32. en cover screws only until snug Do not overtighten the photometer cover screws Doing so will bend the photometer cover and create light leakage 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 22 Rev E Draft 13 Install the photometer subassembly to the chassis by replacing the 3 6 self tap screws through the chassis base in their original locations Line up photometer with locating marks made in step 2 Connect the 2 cables removed in step 1 14 Attach the power cord and connect the instrument to the mains supply Set the power switch to ON 1 Insert a borosilicate tube filled with plain water into the read well Do not use a soda lime glass tube since it does not transmit at 340 nm Select test 186 The instrument prints the detected voltage for each filters All voltages should now be between 2 and 10 volts If not check lamp alignment If the lamp alignment is properly set the neutral density filters may need to be changed Add neutrals to lower the voltage Remove neutrals to increase the voltage Filter wheel i Remove screws i Remove screws holding m e holding photometer photometer PCB and remove belt One or two nylon a washer
33. er omitted e Printer assembly mounted to main PCB e Non removable power cord installed Serial port omitted e EPROM hatch omitted and EPROM mounted to component side of main PCB Calibration trimpots accessible from bottom of instrument Calibration not performed in software no keypad calibration e EPROM device may be one of 2764 8K bytes 27128 16K bytes 27256 32K bytes 27512 64K bytes device may be one of 6116 2K bytes volatile 48T02 2K bytes nonvolatile DS1243 8K bytes nonvolatile 48T08 8K bytes nonvolatile an additional volatile static SRAM device 6264 8K bytes volatile may be used in conjunction with a 48T08 RAM device in some instruments e PCB revisions installed components locations and jumpers Refer to the appropriate PCB layout in the PCB Layouts section of this manual 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 4 Rev E Draft Paper roll cover Incubation block gt 2 r Read well Printer Display Keypad Figure 1 Instrument Exterior CAUTION Power switch Serial port AC power inlet Figure 2 Rear Panel 1900 Series Service Manual 1994 1997 Awarenes
34. erfering factors have been ruled out Standards and blanks should be closely checked for accuracy and results should be compared with areference instrument Use of acommercially available photometer check set to verify photometric accuracy and linearity is strongly recommended If field recalibration is needed it should only be performed with the proper reference materials and instruments Software or Hardware Calibration Most instruments manufactured after June 1993 rely on software calibration that is on calibration data stored in nonvolatile RAM The calibration data is used by the instrument to compensate for variations in electronic components During factory calibration any necessary hardware adjustments are made using precision reference standards and specialized electronic equipment The calibration data are stored in the instrument memory and also recorded on a label located on the bottom of the instrument In the unlikely event the instrument must be field recalibrated to meet specifications new calibration data are derived using reference standards and these values are entered via the keypad This requires no hardware adjustments All instruments manufactured before June 1993 utilize hardware calibration This requires making adjustments to the trimpots for absorbance gain and offset and temperature offset To determine whether the instrument incorporates software calibration features select test 213 If calibration data i
35. esistance C is equal to 750 if the measured resistance is greater than 18210 C is equal to 720 if the measured resistance is less than 18210 6 Select test 210 The display shows BLOCK Type the offset calculated above for the block and press ENTER 7 display shows Type the offset calculated for the cell and press ENTER 8 Repeat steps 3 through 6 until the resistance is within the specified range and the displayed temperature is 37 C 0 3 Select test 213 each time to print the current net adjustments 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 39 9 net offset after the temperature is set should be 1 5 C or smaller When you are done select test 213 to print the new calibration data Enter these values on the calibration data label on the bottom of the instrument Software Calibration Absorbance Materials and equipment 10 12 mm borosilicate tube or other cuvette appropriate for the instrument Reference spectrophotometer Reference material which peaks at one of the filter wavelengths Precise 1 2 serial dilution of the reference material Complete the procedure Reset Calibration Data Place a borosilicate tu
36. f providing routine instrument maintenance and repair services 2 Rev E Draft Layout Figure 1 shows the exterior of the instrument Figure 2 shows the rear panel Figure 3 shows the internal chassis layout and Figure 4 shows the bottom of the instrument The instrument housing is comprised of a chassis base and rear panel combined and a formed plastic cover The cover is secured to the base by five 4 self tapping screws A 16 character alphanumeric LED display is mounted to the printer bracket inside of the cover A 20 column thermal printer and the printer PCB mount to a metal printer bracket which in turn mounts to the inside of the cover The display and the printer assembly both connect to the main PCB via 14 conductor ribbon cable terminated with DIP dual in line pin plugs The keypad is a membrane switch type sealed beneath a graphic overlay and connects to the main PCB by the 8 conductor extension of the switch layer referred to as the keytail The serial port connector DB 9 is mounted to the rear panel and connects to the main PCB with a 4 conductor cable and SIP single in line pin header The photometer assembly connects to the main PCB via a 14 conductor ribbon cable and DIP plug as well as a 10 conductor rainbow ribbon cable and double row header The incubation block connects to the main PCB via a 4 conductor cable and SIP header The 12VDC cooling fan is mounted to the chassis base and connects to the main PCB via a
37. he serial port Early models Current models 1 GND 1 GND 2 TX 2 TRANSMIT MOSQUITO 3 RX DTR 3 NC 4 9 4 TX 5 8 NC 9 12VDC 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 15 Rev E Draft HSH OE gt SOM qv 33 S44 052 123 33113 30 38 Sant 35 301 S008 Zi ONTO 33 SP 19 dg33r8v3l Shao Figure 6 Oscilloscope Waveforms 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 16 Error Messages Rev E Draft Error messages are displayed to inform the user of a possible problem They are intended to help the operator locate the problem If error messages appear frequently the most likely cause will be a hardware problem The following error messages indicate possible interface or component problems LAMP FAILURE PRINTER PAPER JAM FILTER WHEEL ERR The lamp does not appea
38. his procedure is to establish agreement between the actual temperature and the displayed temperature by measuring the actual temperature then entering the difference between the actual and the reported temperatures Note that precision thermistor probes are used Do not use a thermometer A typical mercury bulb or other glass thermometer adds a great deal of thermal mass to the system as well as provides a conduction path for heat thereby frustrating the instrument s heating capability Materials and equipment e 2 12 mm borosilicate tube or other cuvette appropriate for the instrument 2 Reference thermistor probe YSI Inc 44108 or equivalent 30K 25 0 2 interchangeability Digital ohmmeter DMM 0 5 or better accuracy Procedure 1 Complete the procedure Reset Calibration Data 2 Place a tube or cuvette filled with 1 ml of water into the incubation block Immerse the thermistor probe in the approximate center of the tube Place a similar arrangement in the read well Select test 188 to extend the lamp time 3 Allow 15 minutes for equilibration 4 Ifthe DMM being used is not autoscaling set it so that 20K y is in range Zero the meter and then read the resistance of the thermistors If the resistance is between 17994 y and 18435 no adjustments are needed Otherwise continue to the next step 5 Calculate the temperature offsets using the following formula T R 18210 C Where R is the measured r
39. hnology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 47 Main PCB through rev K TO LAMP MOTOR TO PHOTOMETER 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 48 Printer PCB 300 200E RNI c2 PIC16C57 42 2MHZ J3 ON RESI nes GFX Ox 5 eim 2 C EE 300 200 184108E RB 1997 AWARENESS TECHNOLOGY ORG Rev E Draft 9 300 200E PRINTER INTERFACE P N 184108E Note cut jumper J5 for use with non graphics printers 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 49 Printer PCB 300 200 300 200 PRINTER INTERFACE PCB C7 b gt u2 181256 181256 vz erase UD 1 91 050 49 RC 690p iR b J1 1900 Series Service Manual 1994 1997
40. ight or several filter voltages are reported as low Materials and equipment Replacement lamp Phillips screw driver Flat blade screw driver Procedure 1 2 Ifusing the flowcell accessory remove the flowcell and place the instrument in tube mode Set the power switch to OFF O Open the instrument Locate the photometer and the lamp at the left side of the photometer Refer to Figure 8 Lamp Replacement CAUTION Lamp is HOT Allow the lamp to cool before handling Loosen but do not remove the lamp terminal screws Do not loosen or remove any other screws Remove the lamp by lifting it upward out of the connector Use a pair of pliers or tweezers to handle the new lamp Do not handle with bare skin Insert the lamp leads into the connector until they bottom out The lamp filament must be centered on the lens and the lamp body must be parallel with the lamp bracket While holding the lamp in alignment tighten the lamp terminal screws You should be able to visually confirm the lamp alignment by sighting through the lamp and lens to view the aperture on the spring plate behind the lens All three elements should be aligned With the newer lamp bracket Figure 8a you can adjust the height of the lamp using the indicated screw to raise or lower the plate height Set the power switch to ON Shield your eyes from the lamp beam and observe the projection of the beam onto the aperture Refer to Figure 9 Spot Alignment
41. ion Materials and equipment 12 mm borosilicate tube or other cuvette appropriate for the instrument Reference spectrophotometer Reference material whose absorbance peaks at a filter wavelength e g 405 nm Precise 1 1 and 1 2 serial dilutions of the reference material Procedure 1 Place a borosilicate tube filled with plain water into the read well Do not use a soda lime glass tube since it does not transmit at 340 nm Select test 186 and confirm that all of the detected filter voltages are between 2 0 and 10 0 volts If the voltages are out of range refer to the section Troubleshooting Determine the absorbance of both the 1 1 material and the 1 2 dilution monochromatically on a reference spectrophotometer The 1 2 dilution should be in the range of 8 to 1 2 absorbance The 1 1 material should be in the range of 1 6 to 2 4 absorbance Note the absorbance values reported by the reference instrument Press ABS to place the instrument into the absorbance mode Select the required primary wavelength Select 0 for the differential wavelength monochromatic Blank on the same diluent material used to prepare the concentrations Read the 1 2 dilution The reported absorbance should agree within 1 005 of the reference If not adjust trimpot TP2 a small amount clockwise to raise the value counterclockwise to lower the value Repeat this step as needed until the reported absorbance is within limits Read the 1 1
42. ion given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 8 Rev E Draft Enviromental Conditions for Safe Operation Indoor Use Altitude up to 2000 m Temperature 5 C to 40 Humidity 80 for temperatures up to 31 C decreasing linearly to 50 humidity at 40 C Mains supply voltage fluctuations not to exceed 10 of the nominal voltage Recommended Enviromental Conditions Recommended Operating Temperature 18 35 C Recommended Operating Humidity less than 85 Although it may be safe to operate in these conditions it may not be suitable for the performance of your tests Check with your supplier 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 9 Principles of Operation Photometer The light from a tungsten halogen lamp is passed horizontally though the tube or flowcell and the sample it contains The sealed box on the opposite side of the read well contains a rotating filter wheel and photodiode The filter wheel contains optical bandpass filters at various wavelengths and is speed controlled via drivers U9A and U9B in parallel to approximately 4
43. iv Su cov tiv Ziy sa v UY uv 36 80 we ow co av 6v g 62 gt 10 20 zv 5 amp t 90 ev vv Te cow ABE zy ea Q2LIGIHONd 15 3 4 3 iov HE ov ef SI 0 1 2 1200 032180 1 00 jan LHS AL XX61 82d 51 001 1520017 in 174 40553 CX gt 9010 231 SS3N3HVMY To o UM ALE OILVN3HOS 824 NIV 61 dm Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted 1 1900 Series Se for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 56 Main PCB rev L to rev Y 2 of 4 128 19 09 39 GNYDV 91 2 aq snu 05890 9308 9320 38 00zz Ac 9 H SUA 164 2018 24 VOOOEN IN i lt I lt m YEOOZNIN VAN NI AGZ 37022 AGE CRE AOS lu t AOG e 1 6118 PUA ant AOS V 00cN I WHO 2 I 1 133HM 940 YOLYOIONI 431113 iviH 7722 i I o eo len 5 HEN Per ee OND sir FOU TIS See NA 80 a lan i 56n
44. l tooth lock washer must make electrical contact ground with the chassis base for low noise operation 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 30 Rev E Draft blues i Main PCB one multicolor ribbon cable j BROWN conductor Use the 2 adaptor ribbon cables supplied with gray adapter De met use the adaptar ribbon cable cable with this installation RED stripe adhesive backed io meunt PHOTOMETER ADAPTOR BOARD Ei meant blue gt adhesive backed EE Clip to mount PLE YELLOW gray multicolor wires riban cable ribbon cable RED stripe BAOWH conductor 3 CABLES from Photometer Figure 17A 3 Cable Photometer to Main PCB without J17 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 31 Rev E Draft Main PCB 7 multicolor ribban cable BFIOWH conductor WELLOW wires ba RED s
45. ld perform service procedures To Avoid Fire or Personal Injury Use Proper Power Cord Use only the power cord specified for this product and certified for the country of use e Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground e Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult this manual for further ratings information before making connec tions to the product Do Not Operate Without Covers Do not operate this product with covers or panels removed Use Proper Fuse Use only the fuse type and rating specified for this product Avoid Exposed Circuitry Do not touch exposed connections and components when power is present e Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Provide Proper Ventilation Refer to the installation instructions for details on installing the product so it has proper ventilation Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere e Keep Product Surfaces Clean and Dry Safety Terms and Symbols Terms in This Manual These terms may appear in this manual Warning Warning statements identify conditions or practices that could result in injury or loss of life Caution Cautio
46. maintenance and repair services 194355 9 5 T3NYd 1 043 46 1 35147924 Tad 143 33438 19210 1 SY Rev E Draft 1 1 1 B NER agoa 519 LAS ASH 4 VISINSH23I 51104 S LINIYII Adi Id SVS SIG SBN ALEBA oo zi 1 N NIE 24 d SNOISIA3H 1 ius 24 2 SLIOAS Wvusvia Satie dd 3000 00613 ui 19030NH331 553 34 9 1 5 MYY 0534 Ad AL 11145 390 002 AndinO SLIOA 51 1 1 9d SLIOAS 2 vidas 12 720 SLTDAS OL SAXIS ONILNNOW SWH 53104 2 6 ma ANNOYS P 5314 4 0235 30 SLIOA SL OL Nao 3441 MA MOd SNIYW OLNI LINN 91938 SHOLIMS 135 i SWH 51104 02 ISN 39N9H2 343 40d 4083 LINN 9nTdNn 724 51104651 154315 353 1 401104 4311449 HLIM I FT 30 S110 61 01 9 111365 LON 04 NOILNYI S110A 02 Nao NOLLYH3d0 ya 052 511 0110 3 A18H31SSV ZON 1HM NH8 N OHS 2340 2v SLL 1102312 asina Alddns H3MOd ma Wear oll Miva
47. ment Separate offsets are maintained for the incubation block and the read well The calibration data may be printed at any time by selecting test 213 This prints the serial number of the instrument the date of last calibration the stored calibration data the absorbance scaling factor the net block temperature offset and the net cell temperature offset In the event of calibration data loss the temperature offsets for both the incubation block and the read well are set to 0 0 and the absorbance scaling factor is set to 1 000 In this condition the maximum temperature error is 1 5 and the maximum absorbance error is 10 provided the trimpots have not been disturbed The calibration data can be restored as described below To recalibrate the instrument refer to the sections Software Calibration Temperature and Software Calibration Absorbance 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 36 Rev E Draft Restore Calibration Data This procedure restores the calibration data to the original factory settings recorded on the calibration data label Procedure 1 Select test 213 to print the calibration data Verify that the data is as follows ABS FACTOR 1 000 BLOCK TEMP
48. n statements identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product These symbols may appear on the product WARNING Protective Ground CAUTION Risk of Shock Earth Terminal Refer to Manual 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft Instrument Specifications Linear measurement range Photometric accuracy Stability Light source Wavelengths Typical half bandpass Type of filter Tube size Minimum fill volume Maximum fill volume Temperature Warm up times lamp in rate mode lamp in Mosquito Mode lamp in other modes cell incubation block Lamp saver time Speed Display Printer Keyboard Calculation modes Fuse requirements Power requirements Enclosure Dimensions Weight Recommended operating temperature Recommended operating humidity Optional Access
49. nter Interface PCB Replacement Replacement PCBs are supplied in a configuration which will accommodate both graphics capable and non graphics capable printers If the printer to which the PCB will be connected has an eight position ribbon cable either from the factory or as modified cut jumper J5 on the PCB and install the ribbon cable from the printer into the eight position keytail socket see Figure 16 Otherwise install the ribbon cable in the nine position keytail socket and leave the jumper intact Socket for non graphics capable printer Socket for graph ics capable printer Cut jumper for non graphics capable printer Figure 16 Printer Interface PCB 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 29 Main PCB and or Photometer Replacement Before installing a replacement Main PCB and or Photometer determine if a photometer adapter board will be required to insure compatibility between the photometer and the Main PCB The key feature to look for on the Main PCB is the J17 connector Figure 17B The replacement Main PCB will have J17 Photometers are connected with either 2 or 3 cables depending on the configuration The key feature to look for on the Ph
50. ontained in the wheel are of metal deposition type construction and are intended to be maintenance free for the life of the instrument Some older instruments incorporated emulsion type filters whose transmittance can be reduced dramatically if subjected to high humidity over very long periods Refer to the section Filter Replacement 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 14 Rev E Draft Temperature Control The temperature control system is very stable and ordinarily does not require adjustment or recalibration In the event calibration must be verified or reestablished refer to the section Calibration Be sure to read the entire section on calibration before attempting any adjustments Main PCB Under normal circumstances there are no adjustments to be made to the main PCB Circuit failures are highly unlikely but if they occur it is recommended that the repairs be performed by factory authorized technicians There are ten test points on J8 which provide access to a number of vital signals The instrument can be observed in operation with an oscilloscope Typical test point waveforms are shown in Figure 6 Internal Printer The internal printer is a 20 column thermal type
51. ories 0 00 to 2 50 Absorbance Units A 1 of the reading 0 005 A at 1 5A 2 of the reading 0 005 A at 1 5 2A drift of no more than 0 005A in 8 hours bichromatic tungsten Halogen Lamp 340 405 450 505 545 600nm 10nm Multiple cavity sealed interference 12mm round standard 1 mL 2 mL for temperature control to 3712C only 372C 0 32 Block stays on Cell has on off switch 120 seconds built in 240 seconds built in 45 seconds built in 20 30 minutes dependent on ambient temperature 20 30 minutes dependent on ambient temperature after 15 minutes idle 30 minutes in MosquitoTM Mode reads calculates and prints results in 3 seconds alphanumeric LCD thermal dot matrix 20 characters per line 16 key membrane switch 4X4 audible response single point calibration by standard or factor multipoint calibra tion with point to point curve fit multipoint percent absorbance rate by standard or factor batch or singly fixed time kinetic 120VAC 0 6 A 3AG slo blo 120 V or 240V AC 50 60 Hz switch selectable painted flame retardant ABS Plastic cover with metal base 9 5 X 13 25 X 3 75 inches 24 X 34 X 10 approx 10 lbs 4 5 Kg 18 352C less than 85 Redi Check Photometer QA for instrument QC Mosquito Aspiration Flow Cell Accessory Stat Tracks 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Informat
52. otometer is whether or not the lamp socket is wired with yellow wires referred to as a 3 Photometer The replacement photometer will be a 3 Cable photometer with the yellow wires Refer to Table I and Figures 17A and 17B below to determine if an adaptor will be needed to insure compatibility CONFIGURATION ADAPTOR Main PCB Photometer 2 Cable 3 Cable Figure 18 2 Cable Figure 188 3 Cable Table I Main PCB Photometer Compatibility Photometer Replacement 1 Open the instrument as described in Opening the instrument Refer to Figure 3 Locate the photometer Note positioning of the cables leading from the photometer to the main PCB and unplug the cables from the main PCB Mark the perimeter of the photometer on the chassis with a pencil so the replacement photometer can be properly positioned Locate the 3 6 screws holding the photometer assembly to the chassis From the bottom of the instrument remove these screws washers and the speed nuts from inside the instrument while noting the screw lengths and the locations from which they were removed Install the replacement photometer subassembly to the chassis by replacing the 3 6 self tap screws in their original locations Insure that internal tooth lock washers are installed between the screw heads and the chassis base Line up photometer with locating marks made in step 2 Connect the cables removed in step 1 NOTE Theinterna
53. placed is inserted eight or nine slots If there are eight slots modify the replacement Print Head as shown in Figure 13 Refer to Figure 14 and replace the Print Head as follows 5 If ribbon is too wide for socket orient as shown and trim through center of pad as shown enini wide trace Figure 13 Replacement Print Head Modification for Non Graphics Capable Printers Pry out the pin 1 which holds the gear 2 in place Remove the pin 3 from the side of the print head with tweezers and pry the pin 4 from thetop ofthe Print Head The Print Head should now be free to move along the Drive Screw 6 Remove the snap ring 5 from the end of the drive screw 6 and withdraw the drive screw and gear assembly from the printer mechanism in the direction shown Press the end of the slider rod 7 out of the hole in the printer mechanism in the direction shown from the left side of the mechanism It is not necessary to remove the slider rod completely from the mechanism Slide the Print Head off the slider rod and replace with the new Print Head Reassemble the mechanism in reverse order of the above disassembly steps 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services
54. r to illuminated at all Low voltages were detected for all filter positions See the section Photom eter under Troubleshooting The internal printer paper path is obstructed Clear the paper path If the paper path is clear Check the 14 pin DIP cable connecting the printer PCB to the main PCB The instrument cannot detect pulses from the filter wheel Check for rotation of the filter wheel as a dislodged or broken drive belt will prevent the filter wheel from turning Check for signal at J8 2 Check the photometer LED board and the phototransistors Q7 and Q8 on the photometer PCB See the section Photometer under Troubleshooting The following error messages indicate possible failure of the NV RAM U3 U3 can be checked by substitution MEMORY ERROR WATER VALUES RESET DO TEMP SET TEST 210 DO ABS SET TEST 212 The checksum failed when a stored test was recalled The test was deleted The stored water absorbances were corrupted or not found The stored temperature calibration values were corrupted or not found See the section Restore Calibration Data The stored absorbance calibration values were corrupted or not found See the section Restore Calibration Data Note that these messages may occur when doing software upgrades due to different memory space locations for stored data 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Info
55. re currently two means of filter retention in field use silicone glue or a Retaining Ring Refer to Figure 10 and determine if a Retaining Ring is used If a Retaining Ring is used carefully pry two to three of the retaining ring teeth away from the filter until the ring is dislodged and remove the ring and filter If silicone glue is present remove the silicone and push the filter out of the wheel using the eraser end of a pencil or other soft blunt object and the glue should release Remove any remaining filter components from that position in the wheel 8 Locate the neutral density filters dot screen and transmittance filters that were included with the replacement filter and drop them first into the cavity Install the interference filter with the mirror side down Place the replacement retainer over the filter so that the tabs are angled away from the filter and press in place with a 7 16 diameter wooden dowel or similar object 9 Install the filter wheel taking care not to pinch washers under the shaft Reassemble the shaft and washers as disassembled Tighten the shaft securely The filter wheel should spin freely 10 Install the filter wheel belt Be sure that the belt is centered on the filter wheel and is not twisted 11 Install the photometer PCB taking care to center the board around the shaft 12 Replace the photometer cover taking care to position the cable in the slot of the cover Do not pinch the cable under the cover Tight
56. rmation given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 17 Service Procedures Opening the Instrument The cover must be removed to allow access to the inside of the instrument Disconnect the power cable and the serial cable if connected from the rear panel Invert the instrument on a soft nonabrasive padded surface such as a terrycloth towel to prevent scratching Refer to Figure 4 Chassis Bottom Locate and remove the 5 cover screws from the bottom of the instrument Do not remove or loosen any other screws While holding the instrument cover in place with both hands return the instrument to the upright position On some models the printer mechanism is mounted to the main PCB and the printer paper roll must be removed to allow cover removal Press inward on the sides of the paper roll cover and lift it off Lift out the paper roll and tear off the paper where it enters the printer mechanism Grasp the cover at the left side Gently lift the cover upward and to the right until the cabling is visible You can rest the cover on its side while you disconnect the cables Refer to Figure 7 Cover Connections Disconnect the display cable at the left front of the main PCB assembly Place a screwdriver between the 14 pin DIP plug and its socket and pry gently upwards Do not bend the pins Disconnect the printer
57. s 5 VDC power and the control lines from 8255 PPI Programmable Peripheral Interface U5 On early models the printer assembly is mounted to the main PCB with standoffs Temperature control The incubation block and read well are maintained at 37 2C Thermistors 10k 925 2C mounted in the incubation block and in the read well measure the temperature These thermistors are multiplexed at a 0 5 second rate into the feedback path of oscillator U14A The waveform at pin 1 is a sawtooth of approximately 1 2 Vpp amplitude centered at 2 5 V Schmitt triggers U11 convert this to a square wave for current reversal and to drive the CLK2 input of U4 The microprocessor heats the system to maintain the frequency of this signal at 2 08 kHz the 37 2 set point Power resistors located on the bottom of the incubation block are switched to 115VAC via an optotriac which is driven by U9C A red LED located on the block heat PCB illuminates when block heatison and ared LED located on the main PCB illuminates when cell heat is on For the read well driver U10 applies 12VDC raw across heater resistors located on the cell heat PCB 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 10 Rev E Draft System Control
58. s Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 5 Fan Power transformer Fuse block Main PCB lebe 9 18 A test points SSF Incubation block Filter wheel motor ce underneath main PCB 1 E TEE Be Photometer Figure 3 Chassis Layout Voltage select switch 2 ecc a Fan outlet 8 Cover ae dii screw Calibration trim pot hatch Cover Cover screw screw Photometer screws r SU Cover screw Incubation block screws MEM P Cover Front of instrument screw EPROM hatch Figure 4 Chassis Bottom 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 6 Rev E Draft General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Warning Only qualified personnel shou
59. s as assembled F 0 Remove glue or push Shoulder 4 out filter with blunt Screw Remove filter wheel e object gt Install neutral density filters dot screens interference filters and retainers Figure 10 Filter Replacement 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 23 Filter Label The filter label located on the photometer cover describes the specific filter wheel configuration for your particular instrument Filter wheel position is the physical placement of the filter on the wheel The filter wheel position numbers are shown in Figure 11 Note the position of the Index hole and the Home hole Each filter position can have several filter elements installed The four digit filter wheel number identifies the filter wheel batch including filter lot codes dot screens neutral density filters and assembly date for that particular manufacturing lot of filter wheels Some earlier filter label styles may include this individual information If you require specific information for a filter wheel number contact the manufacturer 4 Position 6 6 Position 1
60. s printed the instrument supports software calibration Refer to the section Software Calibration If no calibration data is printed refer to the section Hardware Calibration In either case if the trimpots have been disturbed or components C16 R12 R16 R11 R13 RN8 R24 U16 or the photodiode have been replaced the instrument will require hardware calibration 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 34 Rev E Draft CAUTION Recalibration of the instrument should not be considered until all possible interfering factors have been ruled out INCLUDING CHEMISTRY ERROR OPERATOR ERROR LAMP FAILURE AND DEGRADED FILTERS Standards and blanks should be closely checked for accuracy and results should be compared with a reference instrument Use of a commercially available photometer check set to verify photometric accuracy and linearity is strongly recommended Software calibration should always be attempted before resorting to hardware calibration In the event the software calibration data is lost or corrupted the absorbance factor is set to 1 000 and the temperature offset adjustments for the block and cell are set to 0 0 1900 Series Service Manual
61. s to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 21 Filter Replacement Materials and equipment Replacement filter set Phillips screw driver Flat blade screw driver Procedure 1 Open the instrument Refer to Figure 3 Locate the photometer Unplug both photometer cables from the main PCB 2 Use a pencil to mark the front and side edges of the photometer on the chassis so that the photometer can be installed in its original position Locate the 3 6 screws holding the photometer assembly to chassis From the bottom of the instrument remove these screws and washers while noting the screw lengths and locations from which they were removed 4 Refer to Figure 10 Filter Replacement Remove the four 6 32 screws retaining the photometer cover Set the photometer cover aside 5 Remove the two 4 40 screws securing the photometer PCB Gently move the PCB aside without disconnecting any wires 6 Remove the belt from the filter wheel and pulley Loosen the shaft shoulder screw Remove the shaft and filter wheel Note the number of nylon washers and the order of installation WARNING Retaining Rings used on later production filter wheels will pop out from filter wheel when its spring tension is released during removal Shield the opening with hand and wear safety glasses 7 Refer to Figure 11 Locate the filter to be removed There a
62. s to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 60 Printer Interface PCB 300 200 YOON 01 NONNOD 51i 745 3WOH t tr 2 100 30108 1 91 a f m 2 O D a 5 a2 1 AS 3NOH G i 1 Wolom 2 07 Q3118lHO8d A1SS33SdX3 51 OZZINOHINYNA VV HS v007 00 824 A9010NH231 SS3N3SVMV dd 29 39 v2 2 303 21 O OHOSGdN ONISM 0 41 4 31242 JO 104100 5 100 35104 03143ANL NY MOHS TIM 60 Nid 03583A3U SI ZO di S310N A06 82 5 rt 15634 zum 39027 19 AOS 93 B g gt 0 TS 2 0i 6 AOS Jr 19 JANN XOL INY JOVANSINI 0061 006 824 nOY4 8 0 Nid 1 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 61 Rev E Draft Incubation block PCB MOL XSI LNANOdNOD S00S66 32018 1V3H NOLLOV3H X908 NOLLOVAY ZMS H LIMS 1997195 SSS3NUVH ONISHIM OV OL HOLO3NNOO 1900 Series Ser
63. t test 213 to print the calibration data Verify that the printed data is as follows ABS FACTOR 1 000 BLOCK TEMP 0 0 CELL 0 0 2 Ifthedataprintedinstep 1 matches the example shown stop The calibration data is already reset If the data printed in step 1 matches the data shown on the calibration data label on the bottom of the instrument and you do not wish to alter the calibration stop Otherwise make a note of the values printed in step 1 3 Select test 210 The display shows BLOCK Enter the negative of the value printed for BLOCK TEMP This will reset the block temperature offset to 0 0 4 display shows CELL Enter the negative of the value that was printed for CELL TEMP This will reset the cell temperature offset to 0 0 5 Select test 212 The display shows ABS FACTOR Enter the inverse of the value printed for ABS FACTOR in step 1 That is calculate 1 ABS FACTOR and enter the value 6 Select test 213 to print the calibration data The printed data should now match the example in step 1 If not repeat this procedure 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 38 Rev E Draft Software Calibration Temperature The object of t
64. the filament is centered on the optical path The filter wheel turns on a shoulder screw shaft and is driven by the filter wheel motor via a neoprene belt The filter wheel itself requires no adjustments The rotation of the photometer filter wheel is under micro processor control The processor turns the wheel on and off and maintains it rotating at a constant average speed If the processor fails to detect motion of the wheel within 7 seconds of the command to start the Filter Wheel Err message occurs Possible causes The belt has come off the wheel The motor does not respond to drive circuit The drive circuit and or connections are missing or defective The wheel detection circuit connections are missing or faulty Analysis process Note In general the wheel only rotates while the instrument is in a reading mode and the lamp is on Remove the instrument cover per the cover removal procedure Check that the photometer cable J9 blue and the rainbow cable J5 are seated Turn the unit on Measure 5 6 volts at the yellow wire of the filter wheel motor Ground the brown wire the motor should rotate at a rapid rate Confirm that the filter count pulses appear at test points J8 2 In a reading mode check that pin 1 of U9 ULN2003 is high motor on or pulsing Check that U9 pin 16 is low or pulsing The photometer PCB contains a photodiode a very sensitive opamp circuit U16 and phototransistors Q7 and Q8 Because the pho
65. thermal compound 6 INTERNAL TOOTH LOCK WASHER 4 40 X 3 4 SCREW 6 32 X 1 4 SCREW NOTE Theinternal tooth lock washer must make electrical contact ground with the chassis base for low noise operation Figure 18 Main PCB Installation View 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 33 Calibration Each instrument is calibrated during manufacturing using standards that are traceable to the National Institute for Standards and Testing NIST and is tested to verify its linearity to 2A This preset calibration is very stable Absolute calibration can be verified with the use of NIST filters or by comparison to a reference instrument that is known to be calibrated to NIST filters Calibration may be confirmed using a commercially available calibration check set which can be obtained from your distributor A periodic verification of instrument accuracy and linearity is advised Since most lab test results are based upon standards rather than upon absolute absorbances the linearity of the instrument rather than the accuracy is the more critical indicator of instrument performance Recalibration of the instrument should not be considered until all possible int
66. todetector and related circuitry is solid state it should require no service Avoid unnecessary handling of the photometer PCB or removal of the optical cover The lamp is intended to be maintenance free for the life of the instrument since the lamp is turned off automatically after 30 minutes of instrument inactivity Under heavy usage the lamp remains on for longer periods and so may require replacement Also a physical shock to the instrument could cause filament breakage The lamp must be replaced if output becomes low or the lamp fails completely To check for low or no lamp output insert a borosilicate tube filled with plain water into the read well Do not use a soda lime glass tube since it does not transmit at 340 nm Select test 186 The instrument prints the wavelength position and the detected voltage for each filter The voltages should be between 2 and 10 volts If all of the voltages are below 2 0 volts the lamp is the likely suspect As a final check measure the voltage at the lamp terminals If the lamp voltage is much lower than 4 5 VDC the regulator circuitry on the main PCB Q6 and VR1 may be the problem Otherwise replace the lamp Refer to the section Lamp Replacement If only one or two filters report low detected voltages degraded filters or a misadjusted lamp may be the cause To check for misadjusted lamp refer to Figures 7 and 8 as well as the procedure Lamp Replacement The optical interference filters c
67. tripe fon esene PHOTOMETER _ ADAPTOR BOARD BROWN conductor adhesie backed F Use the adaptor cables supplied with adaptor Twist the ribbon cables as shown clip to mount PCB adhesive backed clip mount gray ribbon cable CRED stripe mul 7 ribbon cable conductor 2 CABLES from Photometer Figure 17 2 Cable Photometer to Main PCB with J17 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 32 Rev E Draft Main PCB Replacement 1 Open the instrument as described in Opening the instrument Refer to Figure 3 Locate the Main PCB Unplug cables from the main PCB and disconnect the wires from the trans former 2 Refer to Figure 18 Remove the two screws securing the Main PCB Apply Thermal Compound supplied with the replacement PCB to area between the heat sink on the PCB and the chassis as shown in Figure 18 Secure the replacement PCB in the same fashion as the removed PCB 3 Reconnect transformer wires See Block Diagram section of this manual for proper wire connections Plug in all remaining cables 4 NUT MAIN PCB 4 INTERNAL TOOTH LOCK WASHER NYLON SPACER CHASSIS BASE Apply
68. ustments Re blank and reconfirm the values Refer to Figures 19 and 20 for trimpot locations When you are done select test 213 to print the new calibration data Enter these values on the calibration data label on the bottom of the instrument 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 40 Rev E Draft Hardware Calibration CAUTION Read and understand the section Calibration before making ANY adjustments Hardware Calibration Temperature The object of this procedure is to adjust the trimpots in series with the temperature feedback circuits to obtain an equilibrated temperature of 37 C Refer to Figures 19 and 20 for the location of the trimpots Depending on the particular instrument model the trimpots may be mounted either on the solder side of the main PCB accessible through the hatch shown in Figure 19 or on the component side accessible only by opening the instrument or a combination of both The positions and designations of the trimpots shown in the two illustrations are the same for all models The only difference is the side of the main PCB to which the trimpots are mounted Note that precision thermistor probes are used Do not use a thermometer
69. vice Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 62 Rev E Draft Contact Information If you continue to have problems after consulting your dealer contact the factory Phone USA 561 283 6540 Fax USA 561 283 8020 e mail chemwell support awaretech com Mailing Address Awareness Technology Inc P O Drawer 1679 Palm City FL 34991 USA When contacting us please have serial number of the ChemWell in question Have a description of the problem with as much detail as possible Save any relevant jobs or logs to disk See File Man agement Using ChemWell Pack and send or e mail us the information 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 1900 Series Service Manual Table of Contents Introduction interrete tto 1 Replacement Parts 40 Lay Out co aberat uicit 2 Block Diagram 41 Principles of Operation 6 PCB La
70. y Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services Rev E Draft 41 Front of Hatch instrument Block Temp TP2 Abs Gain TP4 Cell Temp TP3 Abs Offset TP3 TP4 Abs Offset Cell Temp TP2 Abs Gain Block Temp Front of instrument Figure 20 Trimpot Locations top view 1900 Series Service Manual 1994 1997 Awareness Technology Inc Unauthorized duplication is strictly prohibited Information given in this manual is restricted for use by authorized personnel and is to be used for the sole purpose of providing routine instrument maintenance and repair services 42 Rev E Draft Hardware Calibration Absorbance The objective of this procedure is to adjust the instrument so that the reported absorbance agrees with that of areference instrument Three criteria must be simultaneously met the detected filter voltages must remain between 2 00 and 10 00 volts the gain must be adjusted so that a relatively low absorbance is correctly reported and the offset must be adjusted so that a relatively high absorbance is correctly reported Certain models may require a different calibration procedure or may be calibrated to specifications other than shown here Consult the Owner s Manual or contact the distributor for further informat
71. youts e sesssesoesseccoesccsseesossocsseesoesoe 42 PhotomMeter 3 dete 6 Main PCB from rev 7 42 Display Keypad and Printer 6 Main PCB from rev L to rev Y 43 Temperature control eessss 6 Main PCB through K 44 System Control sse 7 Printer PCB 300 200 45 Troubleshooting eere eere 9 Printer PCB 300 200 46 Power Supply eene 9 Incubation Block PCB 47 9 Schematics eee tti etri re 48 Temperature Control 11 Main PCB from Z 1 of 4 48 Mam ers 11 Main PCB from rev Z 49 Internal Printer 11 Main PCB from rev Z 3 of 4 50 Display dei ra nete 11 Main PCB from rev Z 4 of 4 5 Keypad eese ete ees 11 Main PCB rev L to rev Y 1 of A 52 Serial Pori ceteris 11 Main PCB rev L to rev Y 2 of A 53 Error Messages 13 Main L to rev Y 3 of A 54 Service Procedures 14 Photometer PCB from rev L 55 Opening the Instrument

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