MicroLoop - ServiceManual - Frank`s Hospital Workshop
Contents
1. gt RES ou N N 1 9 8 C14 SIN HoH 3 en Be KEYPRO STN DS CS2 RES PIN 1 RES XTAL EXTAL Ze ig R23 815 au N A joey gt Ala 35 21 N c 42 3 Ais 36 Okt 108 qn cs 4 5 37 6 c R RN1 oe s b 1 2 4 7 5 6 18 5 8720 5 Tae i 2 i 04 44 BY 12x 3 1323 5 46 See 2122 a 48 B gt CAD a 21 A 42 so PET 16 17 19 18 S 20 11 BS 4 da su 02 j eu Jd e 1 24126 SK2 8 su 5 18 20 12 9 PETI ig PINI au 5 6 8 AE Bo 8 PCE 9 MISO ANZ 7 SU BE 3 515 22 47 cis R18 IC13 FE 147 524 114 3 1 27 34 90 2 3 16 5 POS gt SK2 PIN 6 51113 12 1 AZ vn ec2 013 a 18 3 Pel lip 3y 2 05115 10 92 Er au s G 59 17 9 19 2 9 Ice 5K2 PIN2 R20 a Dat ig R19 c a 7 DS AS 32 lt s e pe ct AnA mi oe E s 43 BNO pu 07 5 H gt SK2 PIN 4 21 5 IC2 6 916 2 2788 x 23 33 lt cie 5 26894 PAS Mos gt ae anea 23 45 SL2. 5 5K2 PIN 3 Be OE 23 24 Se ALI og LPO pu ahs iz Bu 52 000 3 4 20 1 514 au 28 i R16 LSS 4 81 RES 2 b 22 AIS au BU SU eh 3 28 so ERS 5 is 1 pre 10 20 KF ma s g IN 03 BU BU gt SKI SCREEN 3 12 ski PIN 4 nl 111 13 8 e l EE 5 SKI PIN 2 5 1 lt 18 15 RO 3 4 OV 2 3 R10 ev MAI 1S SINC 2 Pes x 31 ze 15 lt 6 Te 1831652 U BACKUP 8812 ANS I lt 4 17 Proz ER IC8 12 at RES lt 1 16 2 5 13 1a iaL ojeNnec s 14 gt CS5 NC re es 29 2 L pu 1 2 SU gu R24 D6 gt FE F as a R12 i 1 DISPLAY L1 1 7 I 1 3D1 1 SKS Ko J eke Ne R14 R15 ER R4 Av su E SA Sii 4 5 NER BE SR IL ee Berto use pa Z LED I Uu BACKUP B 4 au 1 R NC 1 11 1 301 2 1612 Inc elle 38 N 4 5 5 4 a PIN3 253 a a _ N B x 3 ae 07 g 8 S L2 BE NI CAD N 2120 SK3 PIN 8 B gt SK3 PIN 9 A gt NO ge 13 14
3. 06 10K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 100K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 100K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 100K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 100K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 100K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 1K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 33K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 330K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 10K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 10K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 4 7K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 4 7K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 3 3K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 3 3K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 3 9K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 1K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 100 OHMS SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 1M SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 4 WAY COMMONED 10K SIL NETWORK T18 S I S B S T 20 PHIER 20K LINEAR POTENTIOMETER RUBYCON 22uF 35 VOLT ELECTROLYTIC CAPACITOR TYPE 35MH522M0563 RUBYCON 47uF 16 VOLT ELECTROLYTIC CAPACITOR TYPE 16MH547M6357 RUBYCON 47uF 16 VOLT ELECTROLYTIC CAPACITOR TYPE 16MH547M6357 RUBYCON 47uF 16 VOLT ELECTROLYTIC CAPACITOR TYPE 16MH547M6357 RUBYCON 47uF 16 VOLT ELECTROLYTIC CAPACITOR TYPE 16MH547M6357 RUBYCON 47uF 16 VOLT ELECTROLYTIC CAPACITOR TYPE 16MH547M6357 RUBYCON 47uF 16 VOLT ELECTRO
4. 9uUH SURFACE MOUNT INDUCTOR DMF 50424N OPTREX 128 X 64 GRAPHIC DISPLAY MDS4 4 WAY MINI DIN SOCKET 95001 2611 MOLEX 6 WAY DATA SOCKET 10 WAY PIN HEADER MJ 179P DC POWER SOCKET B 3B PH SM3 TB 3 WAY PCB SOCKET FROM JST PKM35 4A0 MURATA PIEZO CERAMIC SOUNDER 4 9152MHz CRYSTAL CAN STYLE HC49 4H 32 768KHz CRYSTAL NI CAD BATTERY PACK 6 X AAA CELLS CR2040 280mA Hr 3V LITHIUM PCB MOUNTED BATTERY Technical Support Great Britain and World Headquarters Micro Medical Ltd PO Box 6 Rochester Kent MEI 2AZ Telephone 44 0 1634 360044 Fax 44 0 1634 360055 Web Site http www micromedical com uk Email support micromedical com uk Contact Micro Medical Ltd for the local agent in your region or country for local service Fault Analysis The following analysis is only a guideline and should be carried out in a logical sequence If the fault is still apparent after the following suggestions then the unit should be fault found using the circuit descriptions and circuit diagrams provided When the unit is turned on there is no display present Rotate contrast thumb wheel anti clockwise to see if screen darkens Connect charger to see if screen darkens and charging light illuminates When the unit is turned on the display is dark purple Rotate contrast thumb wheel clockwise to see if screen colour becomes lighter and characters are displayed Connect charger to see if screen characters appear FVC rea
5. LYTIC CAPACITOR TYPE 16MH547M6357 RUBYCON 47uF 16 VOLT ELECTROLYTIC CAPACITOR TYPE 16MH547M6357 10nF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 15pF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 10nF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 12 DISPLAY SK1 SK2 SK3 SK4 SK5 SPKR X1 X2 BAT1 BAT2 10nF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 33pF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 33pF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 1nF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 1nF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 100nF PHILIPS SURFACE MOUNT CERAMIC CAPACITOR SIZE 1206 DTC114EK RHOM NPN DIGITAL TRANSISTOR DTC114EK RHOM NPN DIGITAL TRANSISTOR DTB113EK RHOM PNP DIGITAL TRANSISTOR DTA114EK RHOM PNP DIGITAL TRANSISTOR FMMT591 ZETEX PNP TRANSISTOR SOT23 2SB1189 RHOM PNP TRANSISTOR MPT SOT89 DTC114EK RHOM NPN DIGITAL TRANSISTOR T1 3mm ORANGE LED IMN10 RHOM 3 DIODE ARRAY IMD PACKAGE IMN10 RHOM 3 DIODE ARRAY IMD PACKAGE IMN10 RHOM 3 DIODE ARRAY IMD PACKAGE S1NB20 SHINDENGEN 1A BRIDGE RECTIFIER 1SR154 400 RHOM 1A DIODE PSM PACKAGE ALTERNATIVE SHINDENGEN D1F20 S1ZAS4 SHINDENGN 1 2A DUAL SHOTTKY DIODE S1ZAS4 SHINDENGN 1 2A DUAL SHOTTKY DIODE BAS19 SMALL SIGNAL DIODE SOT23 PACKAGE ZHCS750 ZETEX SMALL SIGNAL SHOTTKY DIODE SOT23 PACKAGE NLC565050T 3R9K 3 9uUH SURFACE MOUNT INDUCTOR NLC565050T 3R9K 3
6. MicroLoop ServiceManual 047 11 Iss 1 0 March 1998 Contents Sy St em OVER VIG W osha ee euere 3 FIT Gr dire onl ee E N een 3 Transducer u alen nennen 4 Fig res2 asum le rer ee ee a damn ante ve 4 Disassembling the Microloop for Circuit Investigation 5 Circuit Description OVERVIEW weiss ea aa sss des nabs vdwase dud udedwana Saha qaa ai uu shes weand aa 6 Processor GOntrol Secli n n sahacine teen n Q 6 nett kasa A E ETE 6 Address en E O EER 6 m eile S yoni u aa A E kaa ode ne eS I A 6 KIYDI p sau o repre errr eer re a au a arte Er ee T a a a n errr 6 Glocke au mau s e a usu CA lee eld M my 7 Diospa 7 mula ee a i a sin am ran 7 patery Monillefigga Su ns yaa amu St Sua 7 maa sumata a ut s amk Nas usu sua A N 7 ar cs u n um m Quan ku miu mi st 8 Parts Listu a u aaa Enge peaavesdvewsgeusseamdegesnnsmnsd Yau q u a suwaq 9 TECHNICA SUP PON E T 11 Fault AnalySiS davnanunalwacewiaduaashauseuusecdususavactudacudndvani
7. an adjustable switching regulator IC 12 and a lithium backup battery together with the NI CAD charging circuit and low battery detector The 9 volt regulator IC7 is only operational when the mains adapter is connected and effectively replaces the 7 2 volt battery pack BAT1 as the two supplies are connected through the dual diode D6 During this time the battery pack is trickle charged from the external supply by the 25mA constant current source formed by TR6 D1 R4 and R7 The bridge diode network D4 provides protection against reverse polarity on the external supply The inductors L1 and L2 provide attenuation of conducted noise to the external supply The terminal voltage of the battery pack is monitored by an analogue input of the processor AN3 through the potential divider network formed by R8 and R9 R8 is connected to the 9 volt supply which is only active when the external supply is in use The processor can detect when the external supply is in use as the analogue input will rise to above full scale 5 volts when this occurs The input to the 5 volt regulator IC11 and the voltage inverter IC 12 is controlled by TR5 which is turned on when the output of IC10 Ais high 1 10 gates A and form a bi stable latch controlled by the ON and OFF switches the keypad or by the microprocessor via TR1 and TR7 The processor turns on TR7 by taking port pin PA5 high when the unit turns off automatically either after a time out p
8. dings are low Remove Turbine from Transducer housing Taking the Turbine move it uniformly through the air and check that the vane is not sticking The unit does not record any blows Inspect Transducer housing connector for damage Check that Transducer housing lead is properly connected to SK2 Remove Turbine from Transducer housing Taking the Turbine move it uniformly through the air and check that the vane is not sticking Blow into Transducer housing and move Transducer head cable around to check for breaks in the cable
9. e the rear adhesive label and disregard We recommend that you use a Philip Number Zero screwdriver for the following instruction 3 Place the Microloop face down to remove the two screws in the lower moulding and put the screws to one side 4 Turn unit face up and ease the upper and lower mouldings apart by lifting the top moulding at an angle as illustrated in the diagram below until it becomes loose 5 Easethe LCD display printed circuit board out of its plastic supports and rest inside of upper moulding 6 mains power supply 7 The Microloop is now ready for Circuit Investigation If you are not familiar with the operation of the Microloop please read the following section in this manual Circuit Description and use the Circuit diagrams at the back of this manual Top moulding Locating lugs Battery pack Display 2 off screws Bottom moulding Circuit Description Overview 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 stored in the battery backed RAM The power supply uses the mains adapter internal Nickel Cadmium Ni Cad cells and an internal lithium backup as its sources of energy The supply provides 5 volts to the control circuit 12 volts supply for the display and RS232 driver circuit 3 volts RAM backup co
10. eriod or when the battery is low to conserve power Transducer interface The supply to the two series LED s inside the transducer housing is provided through TR3 This is controlled by port pin PA3 of the processor and is only turned on during a spirometry manoeuvre to conserve power However power is supplied to the transducer through D5 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 phototransistor connected to pin 2 is provided by R18 and R21 in parallel with a digital potentiometer IC13 The pull up resistor for the other phototransistor is provided by R19 and R20 in parallel with digital potentiometer IC14 Both digital potentiometers are factory set by the processor to give the largest possible signals on the collectors during a spirometry test and require no further adjustment The processor writes to the control lines of the potentiometers pins 1 2 and 7 during this set up via the output latch IC5 The signals from the phototransistors are applied to the pulse timing input of the processor pin 32 and a general purpose port pin 33 after being squared up by the action of the schmitt inverters IC8 and The rising edge of the signal applied to pin 32 causes an interrupt to be generated in the processor This interru
11. ncaausacduasatanstde 12 Circuit ee 13 MicroLoop System Overview Fig 1 The Micro Medical MicroLoop 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 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 x 2 1 3 Fig 1 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 depe
12. ndant upon the direction of airflow 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 amain 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 in eg nie ie er mal I e S a soe Se Mes ee ee ES z Infra red detector Volume k X No of pulses Volume proportional to the number of pulses Flow proportional to the puse frequency Flow k pulse period Disassembling the Microloop for Circuit Investigation 1 Disconnect all mains power supplies 2 Remov
13. nter and the external RS232 port using its serial communications interface Serial information from the microprocessor is switched to either the printer driver or the external RS232 port under the control of the signal appearing on pin 9 of the latch IC5 This signal controls the switching logic of IC10 and IC8 The serial output from the microprocessor is applied to the input of IC10 Depending upon the state of the control signal the serial information will either pass through 1 10 to the printer controller IC17 or through the level converter TR4 and R22 to the external RS232 port Battery monitoring The microprocessor contains eight 8 bit analogue to digital converters One of these AN3 is used to monitor the condition of the main supply BAT1 The main supply is monitored at the input to the logic 5 volt regulator IC11 and the user will be alerted to a low battery condition when the voltage falls below 6 volts The voltage is divided by two with R8 and R9 to bring the voltage within the range of the A D converter 5 volts AN3 also detects when the external power supply has been applied One end of R10 is pulled to 0 volts when the external supply is not applied and the voltage read on the A D converter will be up to 4 volts for a fully charged battery With the external supply applied the voltage will rise above 5 volts Power Supply The power supply consists of linear 9 volt and 5 volt regulated supplies IC7 and IC11
14. ntrols the charging current to the Ni Cad battery pack and provides for battery management The microprocessor IC1 communicates with the real time clock IC6 the output latch IC5 and the display under the control of the program stored in the RAM IC2 using a multiplexed address and data bus decoded by a data latch IC3 The RAM which is used both for program storage and for temporary data storage has a memory map which is partitioned by the action of the PAL IC4 into writable and non writable areas Refer to Drawing 047 01 Address bus The microprocessor IC1 uses a multiplexed address bus The lower order address lines are latched into IC3 with the address strobe AS The program for the microprocessor is stored in a 128k Byte battery backed static ram IC2 As the address space of the processor is limited to 64kBytes the ram address space is paged using a programmable array logic device IC4 This device decodes address lines Al 13 14 15 port lines 5 ontrol line R W clock signal E mode control lines MODA MODB and the external reset line to provide the following outputs RAM address lines A15 and A16 Chip select lines CS for the display and latch IC5 Write enable WR for display latch and RAM Read enable RD for the display Output enable OE for the RAM Reset The reset circuit consists of a single chip reset IC9 which holds the reset line RES low for 350ms after
15. pt is processed by incrementing a pulse count timing the period since the last pulse and by reading the state of pin 33 The pulse count is used 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 The state of pin 33 at the time of the interrupt determines the direction of flow Parts List Designation IC1 IC2 IC3 IC4 IC5 IC6 IC7 IC8 IC9 IC10 IC11 IC12 IC15 R1 R2 R3 R4 R5 R6 R7 Description MC68HC11E1FN MICROCONTROLLER KM681000BLG BLG L SAMSUNG 1 MEG SURFACE MOUNT STATIC RAM 55 TO 150nS ACCESS TIME 74HC573 SURFACE MOUNT OCTAL LATCH PALCE16V8Z25PC AMD ZERO POWER CMOS PLD DIP PACKAGE 74 273 SURFACE MOUNT OCTAL D FLIP FLOP PCF8583T PHILIPS SURFACE MOUNT CLOCK CALENDER WITH 256 BYTE RAM LM2940T 9 0 LOW DROP OUT 9 VOLT 1 AMP REGULATOR 74 14 SURFACE MOUNT SCHMITT INVERTOR DS1233D 10 DALLAS ECONO RESET 4093 SURFACE MOUNT QUAD NAND GATE LM2931M 5 0 LOW DROP OUT 5 VOLT 100mA SURFACE MOUNT REGULATOR LT1054CS8 SURFACE MOUNT VOLTAGE CONVERTOR BU4S11 OR BU4S01 RHOM INDIVIDUAL CMOS GATE 100K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 1M SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 1K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 27 OHMS SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 330 OHMS SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 1206 1K SURFACE MOUNT RESISTOR 0 125 WATT 5 SIZE 12
16. the 5 volt supply has reached the threshold voltage of 4 5 volts The reset signal is applied to the microprocessor IC1 display programmable array logic device IC4 and the printer driver processor IC17 Keypad The 12 keypad switches 0 to 9 ENTER and DELETE are arranged in a 3 column by 4 row matrix When the keypad is being read by the processor the 3 columns are sequentially driven high by the output latch IC5 pins 19 16 and 15 The state of the 4 rows is read by the general purpose port PE4 to PE7 of the processor The diodes in the package D2 isolate the outputs from IC5 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 and OFF keys are connected to the power control circuitry described in the Power Supply section Real Time Clock The real time clock IC6 is set by the processor during the factory set up and should not require any further adjustment The processor communicates with the real time clock RTC with a serial interface line to pin 5 ofthe RTC The RTC is selected by the signal from pin 12 of the output latch IC5 Display The display is a custom graphic 128 by 64 dot LCD with in built control circuitry The contrast is adjusted by varying the voltage on pin 3 between 4 and 12 volts with VR1 This potentiometer varies the output of the voltage inverter IC 12 Serial interface The microprocessor communicates with the integral pri
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