MicroLoop MK8 Service Manual
Contents
1. 8 Service 105 45 Issue 1 0 August 2007 Micro Medical Contents MicroLoop System overview MicroLoop Mk8 System Bidirectional Transducer MicroLoop mk8 Repair Disassembling the MicroLoop Mk8 for repairs Re assembling the MicroLoop Mk8 after repairs Circuit description Micro Computer Unit Overview Microcontroller Powers Supply Microloop8 Sensor Interface Keypad EEPROM RTC Display Driver Sounder USB Driver Memory MicroLoop Mk8 Parts List Technical support Fault analysis Specifications Circuit diagrams Overview Microcontroller Powers Supply Microlab8 Sensor Interface Keypad EEPROM RTC Display Driver Sounder USB Driver Memory 105 01 105 02 105 03 105 04 105 05 105 07 105 08 105 09 105 10 105 00 105 08 105 09 105 10 Page 3 Page 3 Page 4 Page 5 Page 5 Page 5 Page 6 Page 6 Page 6 Page 6 Page 6 Page 6 Page 7 Page 7 Page 7 Page 7 Page 7 Page 8 Page 11 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 System Overview 8 System The Micro Medical MicroLoop is data recording spirometer consisting of a hand held microcomputer unit incorporating a high resolution colour touch screen USB interface and transducer ports Supplied with the microcomputer is a Cradle base unit Bi directional transducer disposable mouthpieces mains adapter2. i 4 i lt _ 81 1 T AOI 01 w sT chi 10 2 20 mBo X01 40 EA 21 lt mo x01 T lt 1 en L or sa 9 7 O 3 z mn oo 80 80 NBA Areva T 700 18518 lt gt F 8 4 TERT TA Swys 0 0 901 3 uona YOSNAS 31313134 51414 4 ARDS MDS AEROS 8 5 99 qisonpsuely EA 18518 ASIN 7 s aol AS WW V _ na Siw lt gt FPA NOD 4 WA x x 2 185178 23 oe 19 a rC BAL 9
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6. nose clip and USB cables The MicroLoop is powered by internal Nickel Metal Hydride cells or by the mains adapter supplied either connected to the cradle or directly to the MicroLoop unit When testing a subject the Bi directional transducer is plugged into the microcomputer unit The Bi directional transducer is used to measure the subjects expired flow and volume in accordance with the operating manual MICROLOOP PSU Figure 1 MicroLoop System Components BIDIRECTIONAL TRANSDUCER Bidirectional Transducer 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 that 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 that causes the vane to rotate in a direction dependant 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 a main body that contains a pair of light emitting diodes LED s and phototransistors The transducer is fixed to the mouthpiece holder that pushes into the main body and is captured by an O ring seal The LED s produce infrared beams which are interrupted by the vane twice p
7. 1 AS ANNOS AS a 8 1 9 8 L 9 s z 07 12945 00 81 8 60 501 wosa S WANA 880 80000 XOLA 1 T TAL A 2 3 Age anro 980 A en S QASO2DIN sosanna u 4 NTAS 12 _ JoloouuoO SAL 3 ISHLISTS 6 gt 5 x seu SW Sn Or z sa G If za 1 lt T s KEN 6 aS 8 14 9845 su 1 2 Ace anro 10 562 LD 962 rO Ace AcE 8 1 mag 10 41548
8. for 27410 36 1283 2 off Maplin PDA stylus 36 TDX1048 TURBINE ASSEMBLY 101 00 36 551206 Bi DIRECTIONAL TURBINE HOUSING 10 Technical Support Great Britain and World Headquarters Micro Medical Ltd PO Box 6 Rochester Kent 1 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 Ensure charger is turned on at the mains FVC readings are low Remove turbine from transducer housing Taking the turbine move it slowly through the air and check that the vane is not sticking The unit does not recognise that the transducer is connected Ensure that the Bi directional transducer is correctly plugged into the MicroLoop Inspect the Bi directional transducer cable and connector for damage The unit does not record any blows Inspect Bi directional transducer cable and connector for damage Ensure that the Bi directional transducer is correctly plugged into the MicroLoop Remove
9. turbine from the Bi directional transducer housing Taking the turbine move it slowly through the air and check that the vane is not sticking Specifications Spirometry Measurements Forced VC FEV 75 FEV1 FEV3 FEV6 FVC PEF FEV 75 VC FEV 75 FVC FEV1 VC FEV1 FVC FER FEV3 VC FEV3 FVC FEV 75 FEV6 FEV1 FEV6 FEF25 MEF75 FEF50 MEF50 FEF75 MEF25 FEF25 75 MMEF FEF50 FVC MMEF FVC FEF25 75 FVC FIV1 PIF FIV1 FIVC FIR FIF25 MIF75 FIF50 FIF75 MIF25 R50 FEF50 FIF50 25 75 FET MVV ind Measurements relaxed EVC IVC IC VT TV Ti Te Ti Ttot VT Ti TV Ti IRV ERV FR Test Per Subject Predicted Values Transducer Resolution Accuracy General Storage graphs Printer Output External Printers Power Supply Battery Pack Dimensions Weight Operating Temperature direct sunlight Operating Humidity Storage Temperature Storage humidity Connectivity 5 relaxed VC manoeuvres and 8 forced manoeuvres for each baseline and two post examinations Various depends upon national preference including NHANESIII Micro Medical Gold Standard Bi Directional Digital Volume 10ml volume 0 031 6 flow 3 to ATS recommendations Standardisation of Spirometry 1994 update for flows and volumes 2000 patients with tests including Flow Volume loops and Volume Time For the latest listing of compatible Hewlett Packard printers visit M
10. 063 watt 1 size 0603 RES 3K3 1 0603 0 06W 1K Surface mount resistor 0 125 watt 1 size 0805 0 1uF 25V ceramic capacitor size 0603 19 BLM18TG102TN1 36 IND1032 36 11022 7 14 7456MHz MINI CRYSTALS Farnell 7941481________________ 36 111023 CSX750FJ48MHEz Oscillators crystal citizen Farnell 1019173 _________ 36101204 1 1 surface mount Polyswitch Farnell 1175842_________________ ee 36 1170 JST 2 way side entry PCB socket ee EERE Sia 36 1039 Panasonic 90mA hr Lithium PCB mounted coin cell battery 00000000 36 1179 JAE 1 25mm 10 way Header 3887224______________________ 36 1172 Hirose 2 way connector 36 1143 Hirose 4 way connector 02200002 1160 __ CON SKT SOW OSOM PITGH BIANG Mose 22222222 22222220 36 CON1173 Hirose 10 way cradle connector eee eee eee eee 1 6 1 36 MEC1356 Kniterswtch 36 RES1243 Electronics 20K surface mount pot Farnell 4631889______________ CS 36 1390 Murata SMD Buzzer Farnell 119
11. 25800 TXO9D70VMICEA _______ 360151025 Hitachi 1 4 VGA colour display ee 1 367181023 Hitachi 1 4 VGA colour TET 222222222222 105 11 36 PCB1042 issue 0 4 105 25 36 BAT1040 Microloop Battery Pack Issue 1 0 CASE COMPONENTS e xx xx Xs TET UATE LT TS TUATUAATAA TAT AN S6 MED1533 UL MOULDING Gase beza T amsa 02121207 a 2 22 222 2222 222222222222222 24111 1 4 off MicroLo0p _____________________ NNN NNN EE 05 03 Number label W 3 0 8 PRST30 ZC1D 36 1088 polymate 30 panhead screw posidrive 3x8mm zinc amp see 117 503 TBA 36 PSU1013 Ault universal 5 volt mains adapter supplied by ____________ 36 CAB1098 USB lead n denen cee S Sayay p h 36 1099 USBlead Unitto Printer 1 36 1057 MORVAN Three pole mains
12. 5 C6 C7 C8 C9 C10 C14 C20 C22 C24 C33 C37 C42 C47 C51 C52 C53 C54 C59 C60 C65 C72 C74 C77 C78 C79 C87 C88 C89 C90 C91 C92 C93 C94 0 1UF0603 36 CAP1009 C95 C96 97 98 C99 C100 101 106 C107 C110 C111 C112 C13 C15 C18 C19 C40 C41 C117 C11 C12 C25 C29 10 0603 36 1113 36 1122 21 038 069 70 71 81__ 11170609 G26 C28 030 C32 34 038 081 INEM weed 2 27 C73 4 70 1206 36 1047 36 1130 U TADIO7KOIGR 36 1067 p 36 CAP1109 ONO 36 CAP1109 C43 C44 C45 C46 C48 C58 C68 C103 2 2uF10V 0603 36 CAP1126 C114 C115 C113 C85 C66 C76 C86 2 2UF0805 36 CAP1031 ___ 36 1128 ______________ ros _____ 36 1006 Te C83 C104 C108 C109 1UF 10V 0603 36 CAP1125 36 0101008 2 03 04 05 D13 14 018 8398 22 D6 011 ZHCS1000 36 0101020 36 0101051 1 36 0101008 SA 36 0101052 4128 22222 36 IND1030 36 IND1020 36 IND1013 ais 36 IND1024 Wo T Laena 36 IND1014 1R Surface mount resistor 0 125 watt 1 size 0805 RES OR 1 0805 0 125W 3 32K Surface mount resistor 0 063 watt 1 size 0603 33R Surface mount resistor 0
13. PCB and display out of the bottom moulding and place on an antistatic work surface Note that the battery is secured to the bottom moulding by an adhesive pad 5 Reconnect the power supply to the MicroLoop Mk8 charging socket 6 The MicroLoop is now ready for fault finding Reassembling the MicroLoop after repairs 1 Disconnect all mains power supplies 2 Place the MicroLoop PCB and display assembly into the MicroLoop bottom moulding 3 Insert the top and bottom end panels into the bottom moulding It may be necessary to lift the PCB slightly in order to fit the connectors through both end panels 4 Ensuring that the keys do not fall out position the top moulding over the bottom moulding and ensure that they both mate correctly We recommend that you use a Pozidriv No 1 screwdriver for the following instruction 5 Place the MicroLoop face down on a soft surface and replace the four screws in the lower moulding 6 MicroLoop Mk8 is now ready for operation Circuit Descriptions Microcomputer Unit Overview 105 01 and Micro controller 105 02 The drawing 105 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 U1 is a Sharp LH79520 32 bit microprocessor with 32K of Cache Ram and no internal flash memory The system clock is supplied by 14 7456 2 crystal 1 J1 is the JTAG interface for pro
14. er 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 The square waves are detected by a microprocessor that measures the period of each pulse and transmits that information to the main unit via a high speed asynchronous serial link 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 Oo Gace dass _____ Infra red detector Volume k X No of pulses Volume proportional to the number of pulses Flow proportional to the frequency Flow k pulse period MicroLoop Mk8 Repair Disassembling the MicroLoop 8 for Repairs 1 Disconnect the mains power supply We recommend that you use a Pozidriv No 1 screwdriver for the following instruction 2 Place the MicroLoop Mk8 face down a soft surface Remove the four screws in the lower moulding Put the screws to one side 3 Turn the unit face up before easing the upper and lower mouldings apart 4 Taking all precautions against static damage lift the MicroLoop
15. gram code and the files filing system U29 is a 2Mbyte SRAM CY62167DV30 used to store all volatile memory such as video memory and program memory MicroLoop Mk8 Parts List R2 R3 R4 R5 R6 R7 R8 R10 R11 R14 R17 R31 R38 R40 R41 R57 R58 R60 R80 10 0603 36 RES1051 R81 R82 R99 R108 eee dene MC ceil fe teeter terete tere 4 K0603 36 RES1086 R16 R21 R32 R33 R37 R51 R61 R62 R63 R66 R67 R68 R69 R70 R85 R86 R93 00 0603 36 51044 R95 96 R102 R103 R105 R106 R110 ara 2 49K0603 36 RES1257 R 9 820 825 827 35 847 848 55 865 810 170150805 THAS A 22 1 R23 249K0603 36 RES1259 9 5 a Dwg Manufacturers Part F Farnell JDE part no Description 105 17 36 ASS1235 PCB ASSEMBLY 180805 36 51093 R28 080805 36 1041 R29 3 32K0603 36 RES1260 36 RES1261 ___ 36 8 1262 36 8 1267 36 RES1263 224000 36 RES1251 36 RES1271 36 8 1250 36 8 1242 _ 36 8 1212 R75 51K0603 36 RES1218 fee ee 36 RES1216 36 8 1219 36 8 1071 ____ __ 36 RES1237 R92 3 3K0603 36 RES1235 c C1 C2 C3 C4 C
16. gramming the unit 4 1 is the jumper that must be place for programming and removed for normal use Power Supply 105 03 Battery Charger and Voltage Regulators 06 serves as the battery charger and voltage regulators The capacity of the battery is 1600mAh and the voltage can vary between 3 and 4 2V When powered from mains the charging current is set at 500 When powered by USB the unit can initially draw 100mA When switched on the unit can request up to 500mA from the USB host The 3 3V is used for the microcontroller the reset circuit jtag interface buttons eeprom Icd display touch screen Icd backlight sound driver usb flash sram The 1 8V rail is used for the microcontroller flash and the Icd backlight U8 is used to generate the 5V rail This rail is used for Micro Medical Transducers sound driver and USB hosting Fuel Gauge U7 is a fuel gauge which is powered by the battery pack The fuel gauge estimates the remaining battery capacity Microloop8 Sensor Interface 105 04 2 Sensor ports are available on the unit U10 is used to translate the levels from 3 3 to 5V is used to switch the power on for MM Sensor 1 TR8 is used to switch the power on for MM Sensor 2 Keypad EEPROM RTC 105 05 Two buttons are available on the unit is the ON OFF button is the HELP button U13 is used to generate an interrupt to the microcontroller if either the o
17. icro Medical Website at www micromedical co uk Input 100 240 50 60Hz Output 5V 2 0A Rechargeable Lithium Polymer 3 7V 1600mAh 123mm x 82mm x 23mm Transducer 50 x 60 x 90mm Excluding Transducer 191g Docking Station 124g The instrument will operate in a uniform environment of 0 C 40 C out of 30 90 non condensing 20 C to 70 C 10 to 90 RH USB 1 1 8 9 t PRC RSTO SUN 01 PI S 10038 10 91 45 SAPAQ gdp v C mno a 40501 NIRDSIDNOL Y AVIBIC 1850501 Ped 3 19804 L 9 s t z 1 5 1 10 0 1 OIGAGIT VSSA 56 16 Sr OTI BST 10 16 017 Detect Mcrobop BAS21 Microloop8 MicroController Tite Revisi
18. n off or help button is pushed BAT2 is a lithium coin cell to give the RTC power for up to 10 years U10 is the RTC and is clocked by 32 768kHz xtal D2 enables power to be drawn from the 3 3V regulator when the unit is on U25 is a 32Kbyte EEPROM This is used to store general settings and calibrations Display Driver 105 07 The 3 5 TFT LCD Display is driven directly by the main microcontroller The display has a built in touch screen and LED backlight all on the same connector J8 U16 and U17 are used to invert 2 lines from the processor U18 is the touch screen controller U21 controls a constant current through the LED backlight of the display U20 can adjust the current to which U16 has to control U19 is a step up switching regulator used to create the appropriate voltages for the display AVDD approx 8V VGH approx 15V VGL approx 8 Sounder 105 08 The sound driver includes a digital potentiometer and an amplifier The digital potentiometer U22 is used to adjust the volume and the amplifier U23 is used to drive the 160hm speaker with the final signal USB Driver 105 09 The cypress SL811HST U24 is a host slave USB controller which can be used for communicating with a PC or an external printer In host mode 5V power is supplied through TR13 and switched on with TR14 The chip has is clocked by a 12MHz crystal Memory 105 10 U28 is a 32Mbyte FLASH 28F256P30 used to store all pro
19. on 0 3 105 02 Number 10 Sheet 206 82 Aig 707 Date Stttings robert pentley Desithp fies 25 55 SL Ss Or T 1 88 gs rH HH al 191 HH 8 8 8 5 s lt 528 Huy 52 3 83 9 HH 8 8 45 53 1 2 5 8 1 HIH Y 25 E 85 z ze 8 gis od 88 Og 4 1 4 OWL oll S A 14 9 5 z 1 19 NE E I 30LIOGASININ any OMISOHZ F lt 5 2 Hee I ave 5 _ ga amo AOL POL 3908 LD ral 80 01 Z 5 mii 7 an kai m 8 5 gt
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