MicroLab Service Manual
Contents
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4. pulse period Microcomputer Unit Refer to drawings 069 01 to 069 06 and 069 14 to 069 12 The microprocessor control circuit carries out the spirometry routines monitors the transducer pulses and keypad and drives the display under the control of the program module The drawing 069 01 is a hierarchical block diagram showing the connections of the sub sections The rest of the drawings are sub sections and are described in detail below Micro controller 069 02 U2 is a Hitachi HD64F2318 16 bit microprocessor with 256K of flash memory and 8K of Ram The system clock is supplied by 20MHz crystal X1 There is also 512 Kbyte U4 of external Ram used for running a module and storing variable data The internal flash is used for the boot software kernel and the base module The kernel handles the low level interface to display keyboard etc and the base module runs on start up and gives a choice of which module needs to be executed The modules are stored in the external 8 Mbyte Flash PROM U5 The kernel also has a flash filing system which keeps track of all the files in the external Flash PROM The files can be an executable module or spirometry or other module data The filing system is similar to the old PC Dos filing system U6 is just used to control the access to the flash device The speaker J2 is directly connected to the Port pins and the pins are toggled at 1 KHz to generate the buzzing sound U2 is used for enablin
5. 0805 package 10K resistor 196 0805 package 10K resistor 196 0805 package 100K resistor 1 0805 package 100K resistor 1 0805 package 10 ohm resistor 196 0805 package 1K resistor 196 0805 package 10K resistor 196 0805 package 10K resistor 196 0805 package 10K resistor 196 0805 package 10K resistor 196 0805 package 10K resistor 196 0805 package ee No 069 00 19 09 02 Designation Par No R25 ok resistor 196 0805 package R26 10K resistor 1 0805 package R27 10K resistor 1 0805 package R28 13K resistor 1 0805 package R29 82K resistor 1 0805 package R30 337 717 F 68 ohm 1 watt axial resistor R31 39K resistor 1 0805 package R32 68K resistor 1 0805 package R33 100 ohm resistor 1 0805 package R34 10K resistor 1 0805 package R35 1K resistor 1 0805 package R36 OOK resistor 1 0805 package R37 4 7K resistor 1 0805 package R38 4 7K resistor 1 0805 package R39 10 Meg resistor 1 0805 package R40 20K resistor 1 0805 package R41 100K resistor 1 0805 package R42 1K resistor 1 0805 package R43 1K resistor 1 0805 package R44 1K resistor 1 0805 package R45 10 Meg resistor 1 0805 package R46 2K resistor 1 0805 package R47 2K resistor 1 0805 package R48 150K resistor 1 0805 package R49 150K resistor 1 0805 package R50 2K resistor 1 0805 package R51 120 ohm resistor 1 0805 package R52 390 ohm resistor 1 0805 package R53 91K resistor 1 0805 package RN1 107 048 F 6 pin 5 commoned
6. 100K resistor SIL network RN2 19 186 F 5 pin 4 commoned 10K resistor SIL network RN3 776 701 1k 4 individual resistor network 1206 package RN4 776 701 1k 4 individual resistor network 1206 package 5 776 701 1k 4 individual resistor network 1206 package 6 76 701 1k 4 individual resistor network 1206 package R1 499 663 F OK single turn surface mount preset R2 T18 S I S B S T 20 20K linear potentiometer C1 100nF Philips or AVX ceramic 0805 package C2 100nF Philips or AVX ceramic 0805 package 100nF Philips or AVX ceramic 0805 package 4 100nF Philips AVX ceramic 0805 package C5 100nF Philips or AVX ceramic 0805 package C6 100nF Philips or AVX ceramic 0805 package C7 100nF Philips or AVX ceramic 0805 package 100nF Philips or AVX ceramic 0805 package C9 100nF Philips or AVX ceramic 0805 package C10 100nF Philips or AVX ceramic 0805 package C11 33pF Philips or AVX ceramic 0805 package C12 33pF Philips or AVX ceramic 0805 package C13 33pF Philips or AVX ceramic 0805 package 14 33pF Philips or ceramic 0805 package ns No 069 00 19 09 02 Designation Part No C15 197 324 F 4 TER Surface mount Tantalum C16 197 324 i 47uF 16v Surface mount Tantalum C17 100nF Philips or AVX ceramic 0805 package C18 100nF Philips or AVX ceramic 0805 package C19 100nF Philips or AVX ceramic 0805 package C20 100nF Philips or AVX ceramic 0805 package C21 100nF Philip
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10. MicroLab Service Manual 069 17 Revision 1 0 November 2002 OMicro Medical Limited P O Box 6 Rochester Kent ME1 2AZ MicroLab System Overview Fig 1 The Micro Medical MicroLab is a data recording spirometer consisting of a microcomputer unit 1 incorporating an LCD graphic display data entry keypad RS232 serial interface and all associated circuitry This is supplied with a digital volume transducer 2 disposable mouthpieces transducer holder 3 and mains adapter 4 The MicroLab is powered by internal rechargeable Nickel Cadmium cells or by the mains adapter supplied 4 When testing a subject the transducer is inserted into the holder which is plugged into the microcomputer unit The digital volume transducer is used to measure the subjects expired flow and volume in accordance with the operating manual Medical Transducer Fig 2 The Micro Medical digital volume transducer consists of an acrylic tube with a vane positioned between two swirl plates The low inertia vane is attached to a stainless steel pivot which is free to rotate on two jewelled bearings mounted at the centre of the swirl plates As air is passed through the transducer a vortex is created by the swirl plates which causes the vane to rotate in a direction d
11. R6 is switched on switching on TR5 The on state can be held by MC_ON line from the uC whilst it is saving data in the Flash PROM The uC can also switch the power off by means of the MC_OFF line which resets U11 U8 is a DC DC converter with an input range of 0 9V to 10V and an output of 3 3 volts to power the unit Since the range is up to 10V only care should be taken not to use any other external power supply as most of them are unregulated and could output 12V for a 9V unregulated supply U7 is another DC DC converter with an output of 9V This higher supply is used for powering the sensor LEDs R36 and R7 divide the unregulated voltage to a third and are applied to the A D converter of the uC The uC continuously examines the reading and gives a battery low or battery dead warning message From the reading the uC can also deduce that the external supply is connected so it can turn itself off if the unit is left on for a long time Inductors L1 and L2 are placed for EMC filtering and D5 protects the unit from reverse polarity power supply Printer Driver Drawing 069 04 069 05 069 06 The printer driver uses a single chip micro controller U12 with on board program memory and RAM to receive serial data from the microprocessor U2 and control the printer mechanism The printer mechanism uses stepper motors to drive the print head and paper feed Each stepper motor uses four lines driven sequentially The order in which the lines
12. S 2318 microcontroller TOFP100 package Rohm individual CMOS gate SOT23 5 package Samsung 512k X 8 bit CMOS static RAM SOL32 525 Samsung 8M X 8 bit FLASH memory TSOP44 40 Quad 2 input OR gate Linear Technology DC DC convertor SOT23 5 package Linear Technology DC DC convertor SOT23 5 package Linear Technology DC DC convertor SOT23 5 package CMOS Quad NAND Schmitt input gate SO 14 package CMOS Dual D Type flip flop SO 14 package Motorola OTP microprocessor Rohm individual CMOS Schmitt invertor SOT23 5 Rohm individual CMOS Schmitt invertor SOT23 5 Maxim SPDT analogue switch SOT23 6 package Maxim SPDT analogue switch SOT23 6 package Maxim RS232 transceiver SSOP16 package icor clock calander with 256 X 8 bit RAM SO 8 package Dallas semiconductor digital thermometer TO 92B CMOS Dual D Type flip flop SO 14 package Surface mount unbuffered hex invertor LDO adj 5 amp regulator or National LM1084IT ADJ Gold Star 32K X 8 bit CMOS static RAM 28 pin SOP Display driver Quad surface mount op amp Linear Technology DC DC convertor SOT23 5 package 100K resistor 196 0805 package 10K resistor 196 0805 package 10K resistor 196 0805 package 100K resistor 196 0805 package 100K resistor 196 0805 package 100K resistor 196 0805 package 100K resistor 196 0805 package 100K resistor 196 0805 package 100K resistor 196 0805 package 100K resistor 1 0805 package 100K resistor 1 0805 package 100K resistor 1 0805 package 4 7K resistor 1
13. age R16 FMMT491A etex NPN Transistor SOT 23 package R17 FMMT491A etex NPN Transistor SOT 23 package R18 FMMT491A etex NPN Transistor SOT 23 package R19 FMMT491A etex NPN Transistor SOT 23 package R20 FMMT491A etex NPN Transistor SOT 23 package R21 FMMT491A etex NPN Transistor SOT 23 package R22 FMMT491A etex NPN Transistor SOT 23 package R23 FMMT491A etex NPN Transistor SOT 23 package R24 FMMT491A etex NPN Transistor SOT 23 package R25 FMMT491A etex NPN Transistor SOT 23 package D1 HCS1000 etex Schottky diode SOT 23 package D2 HCS1000 etex Schottky diode SOT 23 package D3 HCS1000 etex Schottky diode SOT 23 package D4 HCS1000 etex Schottky diode SOT 23 package D5 HCS1000 etex Schottky diode SOT 23 package D6 BAS19 General purpose diode SOT 23 package D7 UMNINTR Quad commoned diode IMN10 package D8 UMN1NTR Quad commoned diode IMN10 package D9 UMNINTR Quad commoned diode IMN10 package D10 UMNINTR Quad commoned diode IMN10 package D11 HCS1000 etex Schottky diode SOT 23 package D12 BAS21 General purpose diode SOT 23 package D13 BAS21 General purpose diode SOT 23 package D14 DE5SC4M Dual commoned diode D15 U1JC44 1A Toshiba diode D16 HCS1000 etex Schottky diode SOT 23 package F1 MICROSMD035 2 yco 700mA Polyswitch L1 NLFC453232 3R3M 3 3uH inductor 1210 package L2 NLFC453232 3R3M 3 3uH inductor 1210 package L3 353 1340 F 2uH inductor 1210 package L4 353 1340 F 2uH inductor 1210 package L5 353 1340 F 2uH i
14. are driven determines the direction of rotation The thermal print head uses eight heater elements The stepper motors and print head signals are generated on port A and B active high of the micro controller U12 The signals pass through sixteen current transistors TR10 to TR25 Timing for Port A and B is derived from an adjustable oscillator comprising of U21 and associated components Adjusting VR1 varies the oscillator frequency and consequently the period for which the thermal elements are energised This in turn adjusts the print density After the micro controller is first reset the print head is driven to the left until the end switch is activated The end switch consists of a normally closed pair of contacts accessed at pins 1 and 2 of the printer connector J7 The end switch is detected by PD5 on the micro controller Drawing No 069 00 Date 19 09 02 U1 U2 U3 04 US U6 07 U8 09 010 011 012 013 014 015 U16 U17 U18 U19 U20 U21 U22 U23 U24 U25 U26 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 AXB2ATEXK T HD64F2318VTE25 04511 K6T4008V1C BB70 K9F6408U0A TCBO ALCX32 LT1613CS5 LT1613CS5 LT1613CS5 4093 4013 MC68HC705C9ACFN BU4S584 BU4S584 MAX4544EUT T MAX4544EUT T MAX3221CAE 124388 DS18520 4013 4069UB LT1084CT GM76C256CLLFW 55 T R SED1335FOB LM324 LT1613CS5 1 OF 5 Mesi power monitor SOT23 5 package Hitachi H8
15. ed to determine the volume passed through the transducer since the start of the test and the pulse period is used to determine the flow at each volume increment Display 069 03 The display is a high resolution custom graphic 240 by 120 dot LCD It is controlled by an Epson SED1335 display controller U24 which directly interface to the uC The display controller timing is generated by a 10 MHz crystal X4 U23 is a 32K byte RAM to hold the display data The LCD display is based on four planes each requiring different plane voltage It is biased by 22 V generated by DC DC controller U9 VR2 varies this voltage which in turn changes the contrast At dark level the bias voltage is typically 22 6V and the plane voltages are 20 9V 19 2V 3 5V and 1 7V Of course they would be slightly different for different contrast level The plane voltages are generated by resistor ratio dividers R23 R24 R53 R26 R27 and buffered by quad Op amp U25 J8 is a connector to the display Power Supply 069 14 The power to the system is either supplied by the 7 2V ni cad battery or from an external 9V DC regulated power supply If the external supply is connected then TR4 is switched off and the battery is not used R30 ensures that the battery is trickle charged at all times The on off key is conditioned via U10 and applied to set reset D type flip flop 011 On every key press the flip flop toggles between the on and off state In the On state T
16. ependant upon the direction of air flow The number of rotations is proportional to the volume of air passed through the transducer and the frequency of rotation is proportional to the flow rate The transducer housing consists of a main body which contains a pair of light emitting diodes LED s and phototransistors The transducer is fixed to the mouthpiece holder which pushes into the main body and is captured by an O ring seal The LED s produce infra red beams which are interrupted by the vane twice per revolution This interruption is sensed by the phototransistors The output from the collector of each phototransistor will be a square wave with a phase difference between the two of or 90 degrees depending upon the direction of flow There is no routine maintenance required for the transducer other than cleaning according to the instructions in the operating manual Micro Medical Digital Volume Transducer Rotating Infrared Swirl Jewelled vane emitter plate bearing Si H i rd N O D A 1 Tp p d yA bd S P ve ll RM n 5 i o HB wu i ot edo gt E E OA ral Va L S Vn S H Infra red detector X No of pulses Volume proportional to the number of pulses Flow proportional to the puse frequency UL UJ Lj m m Flow k
17. g the internal flash to be overwritten If a new kernel is downloaded the flash is enabled and data transferred U1 is the reset controller which holds the reset line low for 350 ms on power up This ensures that the supply has stabilised before the micro starts TR1 is used by the micro to hold the power supply ON whilst it is writing to the filing system This is to ensure that data is not corrupted when it is writing and the power is turned off TR2 allows the micro to turn off the power and switch off the unit This is normally done when the unit is left on for a long period of time To preserve the battery it turns it off Memory Map 0x000000 0x040000 256K Internal Flash 0x400000 0 480000 512K External Ram for modules 0x800000 Flash Prom Single address used 0xC00000 Display Controller OxFFDCOO OxFFFBFF 8K Internal Ram stack Keypad interface 069 15 The 26 keypad switches are arranged in a 5 X 5 matrix and a separate On Off key When the keypad is being read by the processor the 5 columns are sequentially driven low by the port lines PEO PE4 The state of the 5 rows is read by the port P40 P44 The diodes in the keypad PCB isolate the outputs from the Port to ensure that a high current will not flow from an output set high to one set low if two keys are pressed simultaneously The ON OFF key is connected to the power control circuitry described in the Power Supply section Resistor RN1 ensures that the
18. ge C52 390pF Philips or AVX ceramic 0805 package C53 556 180 F 47uF 16v Surface mount Electrolytic C54 556 180 F 47uF 16v Surface mount Electrolytic C55 10pF Philips or AVX ceramic 0805 package C56 10pF Philips or AVX ceramic 0805 package C57 301 8593 F 47uF 25v Surface mount Tantalum C58 1uF Philips or AVX ceramic X7R dielectric 0805 package C59 1uF Philips or AVX ceramic X7R dielectric 0805 package C60 1uF Philips or AVX ceramic X7R dielectric 0805 package C61 1uF Philips or AVX ceramic X7R dielectric 0805 package C62 1uF Philips or AVX ceramic X7R dielectric 0805 package C63 100nF Philips or AVX ceramic 0805 package R1 DTC114EK Rohm NPN digital transistor SOT 23 package R2 DTC114EK Rohm NPN digital transistor SOT 23 package ns No 069 00 Date 19 09 02 Page 40 5 Designation Part No R3 DTC114EK NPN digital transistor SOT 23 package R4 62 02 6 P channel MOSFET SOT23 6 package R5 62 02 6 P channel MOSFET SOT23 6 package R6 FMMT491A etex NPN Transistor SOT 23 package R7 FMMT491A etex NPN Transistor SOT 23 package R8 FMMT491A etex NPN Transistor SOT 23 package R9 DTB113EK Rohm PNP digital transistor SOT 23 package R10 FMMT491A etex NPN Transistor SOT 23 package R11 FMMT491A etex NPN Transistor SOT 23 package R12 FMMT491A etex NPN Transistor SOT 23 package R13 FMMT491A etex NPN Transistor SOT 23 package R14 FMMT491A etex NPN Transistor SOT 23 package R15 FMMT491A etex NPN Transistor SOT 23 pack
19. keys that are not pressed are read as high Serial interface 069 15 The uC communicates with the PC or the printer via an RS232 serial interface at 38 4 Kbits per sec baud rate with 8 bits data 1 stop bit and no parity U17 converts the RS232 signal to a logic signal of 3 3V The uC has two inbuilt serial controllers SCIO and SCI1 SCIO is used for synchronous data transfer whilst SCI1 is used in asynchronous mode for RS232 Real Time Clock 069 15 U18 is a Xicor X1243 real time clock with 2Kbyte of EEPROM It operates at 32 768 Khz and is powered by the lithium battery The device requires a very small amount of power during standby mode and as the unit will never drain the battery out this should be sufficient to keep the clock going for a long period of time before recharging The clock is set by the processor during the factory set up and should not require any further adjustment The date and time can be changed from the system menu The interface to the clock is via a I2C bus The uC does not have a dedicated 2 bus so two port lines P20 P21 are used under software to emulate the bus The EEPROM is used for storing the calibration value and other system data If the device is ever replaced the unit will have to be reconfigured and recalibrated Temperature Sensor U19 is a Dallas 0518520 temperature sensor operating on their one wire bus protocol It has an accuracy of 0 5 degree centigrade A port line P23 is used u
20. nder software to emulate the one wire bus The ambient temperature reading is used for adjusting inspiratory flow at ambient temperature to respective flow at body temperature Transducer interface 069 16 The supply to the two series LED s inside the transducer housing is provided through TR9 which is switched on or off by TR3 This is controlled by port pin P26 of the processor and is only turned on during a spirometry manoeuvre to conserve power However power is supplied to the transducer through D2 continuously when the mains adapter is connected Inside the transducer housing the two phototransistors used to detect the interrupted infra red beam are in open collector configuration The collectors are connected to pins 2 and 3 of SK2 The pull up resistor for the two phototransistors is provided by R37 and R38 The signal from the phototransistor is applied to the pulse timing input of the processor P16 after being squared up by the action of the Schmitt inverter U13 The signal from the second phototransistor after conditioning U14 is applied to a D type latch clocked by the first phototransistor to determine the direction of the turbine The direction signal is fed to uC via port P17 The rising edge of the signal applied to P16 causes an interrupt to be generated in the processor This interrupt is processed by incrementing a pulse count timing the period since the last pulse and by reading the state of P17 The pulse count is us
21. nductor 1210 package L6 353 1340 F 2uH inductor 1210 package L7 353 1340 F 2uH inductor 1210 package DISPLAY LTA75R227J Nan Ya 240 X 160 graphic display PRINTER STP411B 320 Seiko thermal printer mechanism 1 3 way 0 1 pitch pin header 2 way 0 1 pitch pin header 3 5mm DC power socket from G English 4 95001 2661 Molex 6 way data socket 11 Drawing No 069 00 Date 19 09 02 Page 5 OF 5 Designation Part No 5 14FMN BMTTN TF 14 way 1mm pitch cable connector from JST 6 MDS4 4 way mini DIN socket 7 5 way connection to printer mechanism 8 18FMN BMTTN TF 18 way 1mm pitch cable connector from JST BAT1 3 way PCB socket from JST SPKR PKM35 4A0 Murata piezo ceramic sounder 1 OMHz crystal HC49 4H package 2 571 672 F 32 768 KHz crystal WATCH package 3 95 267 F 4 0MHz 4 485 081 F 10MHz crystal SW 1 773 209 F pole momentary push switch DRIVER2 DRIVER2 SCH EB 2000800 DRIVERI DRIVERI SCH PRINTER PRINTER sch KEYINIO 4 Sensors sensorsch 10 DECOCKS Revision Drawn By Sheet MicroLab Circuit diagram overview 069 01 6 Nov 2002 HATEMP 069 01 sch Number Title Date File Size 13 VI
22. s or AVX ceramic 0805 package C22 100nF Philips or AVX ceramic 0805 package C23 100nF Philips or AVX ceramic 0805 package C24 100nF Philips or AVX ceramic 0805 package C25 100nF Philips or AVX ceramic 0805 package C26 100nF Philips or AVX ceramic 0805 package C27 100nF Philips or AVX ceramic 0805 package C28 100nF Philips or AVX ceramic 0805 package C29 100nF Philips or AVX ceramic 0805 package 100nF Philips or AVX ceramic 0805 package C31 100nF Philips or AVX ceramic 0805 package C32 100nF Philips or AVX ceramic 0805 package 100nF Philips or AVX ceramic 0805 package C34 100nF Philips or AVX ceramic 0805 package C35 100nF Philips or AVX ceramic 0805 package C36 100nF Philips or AVX ceramic 0805 package 100nF Philips AVX ceramic 0805 package C38 100nF Philips or AVX ceramic 0805 package C39 301 8544 F 33uF 16v Surface mount Tantalum CAO 301 8544 F 33uF 16v Surface mount Tantalum C41 197 312 F 33uF 16v Surface mount Tantalum C42 197 312 F 33uF 16v Surface mount Tantalum C43 301 7000 F 100uF 16v C44 1uF Philips or AVX ceramic X7R dielectric 0805 package C45 1nF Philips or AVX ceramic 0805 package C46 1nF Philips or AVX ceramic 0805 package C47 33pF Philips or AVX ceramic 0805 package C48 33pF Philips or AVX ceramic 0805 package C49 197 312 F 33uF 16v Surface mount Tantalum C50 197 312 F 33uF 16v Surface mount Tantalum C51 1uF Philips or AVX ceramic X7R dielectric 0805 packa
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