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SERVICE MANUAL UNICO 2100 SERIES
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1. No A Yes Warm up at least 20 minutes Y Groung OK No Yes Solving ground of power Y supply Check power supply normal No Yes Improve power RESSE 4 supply Max 10 10 PC power supply normal No Yes Replace PC power Y Check voltage regulator for N 0 halogen lamp normal Y Yes Yes v Check photo detector normal Check voltage regulator circuit repair or replace Yes Y No Replace photo detector Check amplifier normal v Is wavelength within 200 399nm range Yes y Check current regulator for No d Replace amplifier D2 lamp working normal me Pepair or replace the Se current regulator Is Delamp working fine No A Replace D 2 lamp 47 TROUBLESHOOTING 8 LED display not complete Yes Y LED OK No Yes Replace LED Replace CPU board 48 TROUBLESHOOTING 9 Halogen lamp or D2 lamp button does not work UV2100 Yes Vv Is mode set at A or T No Select A or T Yes Y Blanking display BLA Yes Waiting sti
2. Check if the light arrive the surface of the detector after it through the 2 Amplifier output voltage stactic 20 30mV Adjust way put black body into sample comparment to blocking the light adjust W1 on amplifier board to change the voltage between pin3 and pin4 of J4 to 20 30mV
3. 1 LAYOUT OF 2100 10 11 12 13 14 15 16 17 18 19 Lamp Compartment Tungsten Halogen Lamp Mirror Monochromator Wavelength Position Switch Motor Wavelength Drive Condenser Lens Sample Compartment Detector Amplifier Power Supply Section Power Switch Fuse Power Supply Board Electric Fan Transformer Interface Board Second Order Filters Motor Second order filter Layout of UNICO 2100 1 4 2 LAYOUT OF UV2100 E I LOI e E MRS N LA FA FA A NN DN N e Re RR pd n et nm 2 I ZEGD GZ dia WE a S Lamp Compartment Tungsten Halogen Lamp Mirror Monochromator Wavelength Positioning Switch Motor Wavelength Drive Condenser Lens Sample Compartment Detector Amplifier Power Supply Power Switch Fuse Power Supply Board Electric Fan Transformer Interface Board Second Order Filters Deuterium Lamp D2 Motor Lamp changeover Halogen Deuterium changeover lever Plane mirror Switch Light blocking shelf Power Supply Board D2 lamp Transformer Motor Second order filters Power Transistor and heat sink Layout of UV 2100 Layout of UV 2100 1 5 THE SYSTEM All of the electronic components except the power transistor are installed on four circuit boards 1 Main power supply board 2 CPU Board 3 Deuterium power supply and current regulator board 4 Amplifier Board 1 5 1 The flow block diagrams are show
4. 9 I E 0 YR i KH e II 2 0 90400 00000 wn CG erae oon coo unn Cor gu HW ano NNNHN a UHE L ee sn 5 an ke fannt en nn S Loa Lac 1 ail m 31 2 MAINTENANCE Working Environment The optimum environment for the instrument is as follows Temperature 5 to 35 C Humidity lt 85 Install the instrument in a clean non vibrational area Avoid direct strong light and air flow The instrument will give better performance if the power supply stability is greater than 10 and the line frequency is greater than 1Hz Always allow the instrument to warm up for 20 minutes prior to taking any readings Replacing Tungsten Halogen lamp and Adjustment Replacing Lamp Refer to the Operators Manual Adjustment Turn the instrument on and make sure the wavelength is in the visible range for the UV2100 The light image rectangular shape should be focused on the entrance slit of the monochrometer as shown in Figure If not loosen the locking screws and move the lamp in the desired direction until the image is centered on the entrance slit Then tighten the locking screws firmly Replacing the Deuterium lamp Replacing the D2 Lamp refer to the Operators Manual Adjustment adjustment is not necessary the lamp is prealigned The light spot of the Deuterium lamp should be focused on the entrance slit of the monochrometer as shown in Figure Ifthe spot is not on the slit loosen and adjust the screws of
5. UNICO 2100 SERIES SPECTROPHOTOMETER Model 2100 Spectrophotometer Model UV 2100 Spectrophotometer UNICO SERVICE MANUAL UNITED PRODUCTS amp INSTRUMENTS INC MANUFACTURER OF QUALITY OPTICAL SYSTEMS 1 732 274 1155 Phone 1 732 274 1151 Fax www unicol com info unicol com 1 GENEARL 1 1 INTRODUCTION The UNICO 2100 series spectrophotometers are single beam instruments The instruments is available in two models the model 2100 which covers the Visible wavelength region from 325nm to 1000nm and the model UV2100 which covers the Ultra Violet and Visible wavelength regions from 200nm to 1000nm The analytical grating system has 1200grooves mm for high spectral dispersion The nominal spectral slitwidth of 5nm is constant over the entire wavelength range The instruments have a large sample compartment which will accept cuvettes up to 100mm in length The instruments have as standard configuration a four cell manual positioner which will accept 4 standard 10mm cuvettes The instruments are microprocessed featuring Automatic zeroing Automatic blanking Motor driven wavelength selection Microprocessed T A conversion Microprocessed Halogen and Deuterium lamp selection Digital wavelength display The large LED display reads out in either Transmittance Absorbance or Direct Concentration The built in RS232C serial interface allows you to connect the instrument to you computer or printer UNICO 2100 Spectrophotome
6. UV 2100 Fig 1 5 3 2 1 LU 64 84 SU 94 25 Amplifier Circuit Fig 1 5 3 3 nz Amor A8 140 AGT ZEZAACTE ODE AMES a AB AnlAST ed DN OHEWEEIS 15 4 Tal hB An AcT4 QN IC ADNE T Dia OFTEWO EE 26 Fig 1 5 3 3 1 Layout of Amplifier Board IC1 w SST8 413 006 27 Motor Drive and Limit Switch Diagram Fig 1 5 3 4 0012 AM 04 HER eb eb tu nu sa g lz An 93 Dar rien te rite Hn Mr EN neo pas CE9 TLIE AAA 28 Fig 1 5 3 4 1 Layout of Motor Drive and Limit Switch Board ri c lt f t oo E N N 29 CPU Circuit Fig 1 5 3 5 D ei EI ZTd B d 4 3T Hd H EXE il ESTE penne llis E Tide BUL yen 3i ada SUD am mu E Ei Ee el s i tle e SC Dum bal Li ET er RO n HOH HOH E BAH A a x mein bb a PROS dil Tx femi R WIT a n 30 Layout of CPU Board Fig 1 5 3 5 1 I B WO 10g IAB dO a DE c m 3455 eh eu Pd o EL zm o TATE TE
7. baseline control y V CPU F C Display T A C F RS232 Wavelength Power Source Halogen D2 lamp change control Keyboard gt Sample Detector Monochromator m Compartment Amplifier Filter selection control and baseline control GOTO Wavelength control V CPU F C Display T A C F Wavelength RS232 Fig 1 5 1 2 System Block Diagram UV2100 1 5 2 OPTICAL SYSTEM The optical system schematic diagram for the UNICO 2100 and UV2100 instruments are shown in Figure and Figure The neutral light coming from the Halogen lamp or the Deuterium lamp is focused by the concave mirror passed through the entrance slit of the monochrometer reflected by the collomating mirror 2 to the analytical grating The light is spectrally dispersed by the grating and reflected by the collomating mirror 2 to the exit slit through a condenser lens continue on through the sample compartment and finally to the photodetector 1 5 2 Optical System Schematic Diagram UV2100 Concave mirror 1 Halogen Detector Condenser Sample Condenser lens compartment lens Concave mirror 2 Grating 1 5 2 Optical System Schematic Diagram 2100 Concave mirror 1 H d Entrance slit Halogen lamp Detector Condenser Condenser lens compart
8. ll blanking is complete No v Check wiring OK No 1 Solving wiring J1 on CPU board 2 Solving wiring J8 on power supply board Yes Yes 3 Solving wiring wiring J5on power supply board 4 Solving wiring J5 on D2 power supply board Y Y Unable to open and Unable to open and close halogen lamp close D2 lamp 1 Replace D2 power 1 Replace D2 power supply board supply board 2 Replace CPU board 2 Replace CPU board 49 TROUBLESHOOTING 10 Measuring recelts incorrect not stable repeatability etc Yes Y Is sample preparation adjust right Yes Is sample preparation installed correctly Yes 1 1 Use right procedures to prepare samples 2 Make sure no bubble in sample 3 Test only after sample stability 4 Select right wavelength 5 get rid of possible interference factors Y Are cuvettes used matched No i Install the compartment correctly Yes No v Is wavelength accurate Use matched cuvetter difference should be within 0 5 T Yes v Are T and 100 T correct E No Use right procedue to set Calibrate wavelength Is photometric accuracy maintained A p sample can t arrive adjust it on power supply board 3 Replace detector 4 Use NBS930D filter check it 1
9. lving wiring J4 on drive board 2 Replace 1413 1C1 1C2 on drive board 3 replace motor Yes Y Is light switch motor working normal v Is filter motor working normal 42 TROUBLESHOOTING 3 Unable to find wavelength limit switch u Yes Is wavelength motor limit i No switch working normal 1 Solving wiring J3 on drive board 2 Replace 1413 IC2 on drive board 3 Replace motor Y Is wavelength limit N switch working normal 2 1 Solving wiring between wavelength limit switch K2 and J8 on drive board 2 replace limit switch 43 TROUBLESHOOTING 4 Unable to find 0 order light Yes Y Is light from halogen lamp No 1 Replace halogen lamp 6V10W Yes 2 If lamp OK Check the voltage regulator circuit on power supply board Y Is light out of the road No Se Adjust the light to the right position Is photoelectricity coupling N o working normal 1 Solving wiring J4 on drive board Yes 2 replace photoelectricity coupling Y Is amplifier working normal No 1 Check amplifier circuit Yes 2 solving wiring J4 on power supply board Y Check wiring 26pin o
10. ment lens Concave mirror 2 Grating 19 1 5 3Electronic system Fig 1 5 3 1 Fig Fig Fig Fig Fig Fig Fig Fig Fig 1 5 3 1 1 1 5 3 2 1 5 3 2 1 1 5 3 3 1 5 3 3 1 1 5 3 4 1 5 3 4 1 1 5 3 5 1 5 3 5 1 Power Supply and Control Circuit for Halogen Lamp Layout of Power Supply and Control Board for Halogen Lamp Board Power Supply Circuit for D2 Lamp UV 2100 Layout of Power Supply for D2 Board UV 2100 Amplifier Circuit Layout of Amplifier Board Motor Drive and Limit Switch Diagram Layout of Motor Drive and Limit Switch Board CPU Circuit Layout of CPU Board Power Supply and Control Circuit for Halogen Lamp Fig 1 5 3 1 past L n p EZ T Frl 22 Fig 1 5 3 1 1 Layout of Power Supply and Control Board for Halogen Lamp Board EZZ TASI a x T 2 E Fal 7 A6IY T ACISV ACIBN WO b isv 1sv VO lLri5v isv 23 Power Supply Circuit for D2 Lamp UV 2100 Fig 1 5 3 2 ASTI 0 0FHT rT rent 3 aevo Di Fl al HI E fa KJ Tee TAI AOE TO TE cod DOHI DUE eI a ADT TA SL VE OO A0 DRHT Td AOS EMIT 0 En Cesar AE as tds SAI ATA We D r He A02 T TO O A002 Ass YR 0 456 24 Layout of Power Supply for D2 Board
11. mittance Absorbance Concentration and Factor indicate the currently active mode MODE KEY selects the Transmittance Absorbance Concentration or Factor mode CONCENTRATION FACTOR KEYS are used in the Concentration mode to set the concentration and or Factor value of a known standard on the digital display PRINT BUTTON to send displayed data to a printer or computer connected to the RS232C serial port 100 T 0A KEY is used to set digital display to 100 T or OAbs It must be reset whenever the analytical wavelength has been changed NOTE When operating at a fixed wavelength for an extended period of time check the 0 T and 100 T readout and readjust if necessary WAVELENGTH SELECTOR BUTTON used to select the desired analytical wavelength of the instrument The wavelength readout digital display is graduated in 1nm increments RS 232C PORT located on the back of the instrument The pin functions for the connector are listed below 1 Chassis ground 2 UNICO transmits data 3 UNICO receive data 7 Signal ground THE RS 232C parameters are Baud Rate 4800 Date Bit 8 Stop Bit 1 Parity None ANALOG OUTPUT Connector is a double banana socket located on the back of the instrument RS 232C POWER Socket POWER Switch PORT Operating Components of Back Side of UNICO 2100 VIS Model Only 1 4 LAYOUT OF 2100 AND UV2100 1 4
12. n drive board OK No Solving wiring between J1 26pin on Yes drive board and J1 on CPU board y Check wiring of single on CPU No board OK Solving wiring between J5 on CPU board and J3 on Yes power supply board v Is CPU board working normal No Replace CPU board 44 TROUBLESHOOTING 5 Unable to adjust to 0 and full range Yes v Is filter motor working normal NO 1 Solving wiring J4 on drive board 2 Replace 1413 1C1 1C2 on drive board 3 Replace board 45 TROUBLESHOOTING 6 At T mode blank 100 display lt lt 100 0 Yes v Is wavelenght within visual range No Yes v v m s D2 lamp on Is halogen lamp on u No No i Yes i 1 Replace D 2 lamp 1 Replace halogen lamp 2 If lamp OK circuit on power 2 If lamp OK circuit on supply board of D 2 lamp power supply board of halogen lamp Anything in sample comparment blocking the light Yes y Remove it No v Is the light out of the road No TT Yes Adjust it to the right position Is filter at the right position No Get rid of the matter of the filter motor and adjust the position 46 TROUBLESHOOTING 7 Turn on display not stable Yes Y Warm up enough
13. n in Figure and Figure When the instrument is turned on the instrument will automatically go through a shelf test and self calibrating procedure as follows A Locate instrument baseline wavelength baseline filter positioning baseline B Memorize dark current the instrument is shut down and automatically after the instrument baseline is located and the dark current will be measured c The instrument is again automatically turned on the wavelength of 546nm will pass through the sample compartment air is used as a reference and impinge on the detector The photodetector will generate photo current The photo current signal is then amplified and converted from an analog signal to a digital signal The digital signal is sent to the CPU The CPU compares the signal received to the memorized dark current It then determines the proper lamp voltage and system gains so Transmittance zeroing and 100 T Blanking are achieved The instrument will display 100 T Whenever you change or select another wavelength to measure you need to blank first with a reference solution otherwise the instrument will not accept any commands 11 Power Source Keyboard Fig 1 5 1 1 System Block Diagram 2100 Sample Detector Monochromator nm Compartment Amplifier SN selection control and baseline control GOTO Wavelength control and
14. ront of the instrument taking care not to unplug any of the connections inside the instrument 5 Remove the metal plate covering the Deuterium Lamp by removing the two screws from the rear of the plate 6 Remove the lamp from the instrument and replace with a new lamp 7 Reverse the order from lines 5 through line 2 CAUTION THE LAMP MAY BE HOT TAKE PRECAUTIONS TO PREVENT BURNS FROM THE LAMP PIES 34 The Correct Position of Light Spot on Entrance Slit Halogen Light Spot N N zz SY COI N GIS N Kee SS Entrance Halogen Lamp D Light Spot ER Deuterium Lamp Vacant Filter Wavelength 1 BLACK 335 370nm 2 VIOLET 380 450nm 3 NAUTRAL 450 550nm 4 ORANG 550 750nm 5 DEEP RED 750 1000nm 6 Vacant 7 MAINTENANCE WAVELENGTH CALIBRATION Wavelength calibration check Refer to the Operatos Manual Wavelength Calibration The Wavelength accuracy is 2nm If the wavelength is off it can be adjusted A JMP calibration terminal can be found on the bottom right corner of the CPU board There are 8 pins in four rows 2 pins in each row The following definitions are made in the system For Row B C D If 2 pins in a row are connected the result is defined as 1 If 2 pins in a row are not connected the result is defined as 0 For How A Very right row If the 2 pins are connec
15. ted the result is defined as If the 2 pins are not connected the result is defined as tr rr CPU Board UNO 2400 Series pectrophotometer WAVELENGTH CALIBRATION CHECK As usual the UNICO 2100 series spectrophotometer retains its wavelength calibration indefinitely However if the instrument receives a sever shock or is abused use the following methods to check wavelength calibration In the Didymium filter method the filter has two special absorbance peaks at 529nm and 808nm When the instrument is calibrated properly you will find minimum Transmittance maximum absorbance at the range of 529nm or 808nm 2nm Note that the specific transmittance values are not important as you are only looking for the wavelength where minimum transmittance maximum absorbance occurs NIEDER Turn instrument on and allow it to warm up for 15 minutes Select the Transmittance operating mode Set the wavelength to 519nm Insert the cuvette filled with distilled water in position 1 in the cuvette holder Insert the didymium filter in position 2 in the cuvette holder Place the cuvette holder into the sample compartment put the distilled water cuvette into the light path and set 100 T Place the didymium filter in the light path and record the T reading on the digital display Hepeat steps 3 through 7 to measure separately the wavelength of the points between 519nm and 539nm Looking for the minim
16. ter 1 2 SPECIFICATIONS MODE Spectral Slitwidth Optical System Wavelength Range Wavelength Accuracy Hepeatability Readability Stability Stray Light Photometric Range Accuracy Standard Cell Holder UNICO UV 2100 Spectrophotometer Table 1 UV 2100 nm 2100 Single Beam Grating System 1200 lines mm 325 1000nm VIS 200 1000nm UV VIS 0 002A hr 500nm s 0 3 T at 340 and 400nm lt 0 3 T at 220 and 340nm 0 125 T 0 1 2 5A 0 1999C 0 1999F 0 004A 0 5A 4 position Light Source Data Output Dimensions Tungsten Halogen Lamp Tungsten Halogen Deuterium Lamp Two line 9 LED display Trans Abs Conc and wavelength RS232C Analog Output 470mm 18 5 Wx400mm 15 7 Dx140mm 5 5 H Weight Power Requirement 10Kg 12Kg 115 230 volt 10 60 50Hz Adjustable 1 3 NOMENCLATURE TRANSM TTANCE ABSORBANCE CONCENTRAT ION FACTOR WAVELENGTH AN NI 6 CONCENTRAT ON FACTOR 2100 S PHOTOMETE TRANSMI TTANCE ABSORBANCE 2 MODE CONCENTRAT ION 3 E FACTOR 7 OABS INT 4 5 1008T 8 o O WAVELENGTH ENT Sees Inc pec 6 GONCENTRAT ON FAGTOR UV 2100 SPECTROPHOTOMETER Key Components of UNICO 2100 Series Spectrophotometer DIGITAL READOUT displays the data of Transmittance Absorbance Concentration Factor and Wavelength The red LED status indicators next to the labels Trans
17. the D2 lamp bracket to bring the spot to the center of the entrance slit Tighten the screws firmly UNICO 2100 Series Spectrophotometer MAINTENANCE Follow these instructions carefully to avoid injury to yourself or damage to the UNICO 2100 series spectrophotometer IT IS RECOMMENDED YOU CONTACT AN AUTHORIZED SERVICE REPRESENTATIVE TO PERFORM ANY MAINTENANCE OR REPAIRS ON THE UNICO SPECTROPHOTOMETERS TO REPLACE HALOGEN LAMP TURN OFF AND UNPLUG THE INSTRUMENT Hemove the four screws on the sides of the spectrophotometer Hemove the cuvette holder rod by unscrewing the rod counterclockwise Very carefully remove the cover of the instrument and place in front of the instrument taking care not to unplug any of the connections inside the instrument Loosen but do not remove the two top screws on the lamp base Remove the lamp from the ceramic base Carefully replace the new lamp Retighten the two screws on the lamp base CAUTION Do not handle Halogen lamp with bare fingers Use a piece of tissue or cloth when handling the lamp The oil from your fingers can cause the lamp to burn out prematuratcly 9 Carefully replace instrument cover and replace screws E Aa a Su TO REPLACE DEUTERIUM LAMP TURN OFF AND UNPLUG THE INSTRUMENT Remove the four screws on the sides of the spectrophotometer Remove the cuvette holder rod by unscrewing the rod counterclockwise Very carefully remove the cover of the instrument and place in f
18. um Transmittance along this record the minimum Transmittance should be obtained between 526nm and 532nm The wavelength accuracy of the 2100 spectrophotometer is 2nm Check The Wavelength Calibration with Didymium Filter 40 TROUBLESHOOTING TROUBLESHOOTING 1 Unable to find filter limit switch 2100 Yes Y Is 12V of J6 on drive board normal No Yes Y Solving wiring between J6 and PC power board OK Check wiring 10pin on drive Yes v Solving wiring 10pin between drive board and power supply board Is filter motor working normal No 1 Solving wiring J4 on drive board 2 Replace 1413 1C1 1C2 on drive board 3 Replace filter motor 41 TROUBLESHOOTING 2 Unable to find light limit switch or filter limit switch UV2100 Yes v Is 4 12V of J6 on drive board No Yes Solving wiring between J6 and PC power Check wiring 10pin No on drive board OK Solving wiring 10pin between Yes drive board and power supply board Is light limit switch working normal No 1 Solving wiring between limit switch K1 and J7 on drive board 2 Replace limit switch SI 1 Solving wiring J5 on drive board Yes 2 Replace 1413 1C1 on drive board 3 replace motor 1 So
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