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Micro Medical Micro, Service Manual

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Micro/Micro Plus 
Service Manual 

 051-07  Iss. 1.0    September 1998

 

 

 

Contents  

    page 

 

Safety Precaution   

3

 

Important safeguards 

3 

Looking after your  
Micro/Micro Plus   

3

 

Introduction  

 

3 

Before you begin   

3

 

Micro/Micro Plus  
system Overview   

4 

Micro Medical 
Digital Volume  
Transducer    

 

5

 

Cleaning the Micro 
Medical Digital  
Volume Transducer 

6

 

Micro/Micro Plus 
exploded view 

 

7

 

Disassembling the  
Micro/Micro Plus for  
Circuit Investigation 

8

 

Reassembling the  
Micro/Micro Plus   

9

 

Circuit description  

10 

Technical Data 

 

12

 

Technical support   

13

 

Parts List 

 

 

14

 

Circuit Diagram 

 

15 

 

Summary of Contents for Micro

Page 1: ...fore you begin 3 Micro Micro Plus system Overview 4 Micro Medical Digital Volume Transducer 5 Cleaning the Micro Medical Digital Volume Transducer 6 Micro Micro Plus exploded view 7 Disassembling the Micro Micro Plus for Circuit Investigation 8 Reassembling the Micro Micro Plus 9 Circuit description 10 Technical Data 12 Technical support 13 Parts List 14 Circuit Diagram 15 ...

Page 2: ...described in this manual If in any way you feel unsure about the successful completion of the service operation you should contact Micro Medical Limited or its appointed agent in your country or region and arrange the despatch of the product to a Micro Medical Limited Service Centre Copyright 1998 by Micro Medical Limited All rights reserved Drawing no 051 Version 1 0 September 1998 All other prod...

Page 3: ...e operated only from the type of power source indicated on the label Looking after your Micro Micro Plus Spirometer o Avoid exposing the Micro Micro Plus Spirometer to direct sunlight o Avoid operating the spirometer in dusty conditions or near to heating appliances or radiators o Do not keep the spirometer in a damp place or expose it to extreme temperatures o Do not direct the transducer holder ...

Page 4: ...icro Plus Spirometer consists of a hand held microcomputer unit 2 incorporating a Micro Medical digital volume transducer 1 1 Micro Medical Digital Volume Transducer 2 Micro microcomputer unit 3 Lung Function Calculator 4 PP3 Alkaline battery BAT2 Micro Medical ...

Page 5: ...ns is proportional to the volume of air passed through the transducer and the frequency of rotation is proportional to the flow rate The transducer passes through the PCB which contains a light emitting diode LED and phototransistor The LED produces an infrared beam which is interrupted by the vane twice per revolution This interruption is sensed by the phototransistor giving a square wave output ...

Page 6: ...g action 2 The transducer may now be immersed in warm soapy water for routine cleaning or immersed in a cold sterilising solution e g Alkacide for a period not exceeding 15 minutes Alcohol and chloride solutions should be avoided 3 After cleaning or sterilising the transducer should be rinsed in distilled water and dried 4 Reassemble the transducer into the Micro Micro Plus Spirometer Alkacide is ...

Page 7: ...eter exploded view fig 1 1 Bottom Moulding 2 Top Moulding 3 PCB Assembly 4 Turbine sleeve 5 Coated O ring 6 O ring capture ring 7 Polycarbonate window 8 2 x Screws Item 8 Item 1 Item 8 Item 2 Item 6 Item 3 Item 7 Item 4 Item 5 ...

Page 8: ...r from the microcomputer unit with a twisting action 2 Turn the unit face down and slide back the battery cover 3 Remove the battery and place to one side 4 Remove the 2 screws on the bottom moulding 5 Turn the Micro Micro Plus face up and ease the top moulding from the bottom and turn the top moulding over so as the unit is in two halves 6 Remove the PCB from the bottom moulding and put the botto...

Page 9: ... moulding 3 Position top moulding on top of bottom moulding and push together ensure that the battery leads are not trapped 4 Turn unit face down and replace the 2 screws 5 Replace the PP3 battery ensuring correct polarity 6 Replace the battery cover 7 Turn the unit face up and refit transducer into the microcomputer unit 8 The unit is now ready for operation Fig 2 ...

Page 10: ...the unit is turned on via the slide switch a momentary pulse appears on pin 1 of IC3 by the action of R8 R9 and C10 This pulse toggles the bi stable circuit so that pin 11 of IC3 will go low turning transistor TR4 on and supplying 9 volts to the low drop out regulator IC4 When the unit is turned off pin 13 of IC3 is pulled low reversing the bi stable action and turning TR4 off If the unit is left ...

Page 11: ... test when the BLOW legend on the display is showing The light beam is detected by the phototransistor which is in common emitter configuration The load resistor is factory adjusted using VR1 to give the largest collector swing when the turbine is subjected to a flow or air at 37 degrees Celsius saturated with water vapour VR1 is factory set and should not be adjusted by the user The signal at the...

Page 12: ...for flows and volumes Volume Range 0 1 9 99 litres B T P S Flow Range 30L min 1000L min Display Custom 3 digit Liquid crystal Power Supply 9V PP3 dry cell Dimensions 170 x 60 x 70mm including transducer Weight Unit only 150g Unit and accessories 550g Operating temperature 0 to 40 C Operating Humidity 30 to 90 RH Storage Temperature 20 to 70 C Storage Humidity 10 to 90 RH ...

Page 13: ...Micro Medical Ltd PO Box 6 Rochester Kent ME1 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 ...

Page 14: ...T 5 SIZE 0805 R8 1M SURFACE MOUNT RESISTOR 0 1 WATT 5 SIZE 0805 R9 1M SURFACE MOUNT RESISTOR 0 1 WATT 5 SIZE 0805 R10 100K SURFACE MOUNT RESISTOR 0 1 WATT 5 SIZE 0805 R11 10K SURFACE MOUNT RESISTOR 0 1 WATT 5 SIZE 0805 R12 100K SURFACE MOUNT RESISTOR 0 1 WATT 5 SIZE 0805 R13 10K SURFACE MOUNT RESISTOR 0 1 WATT 5 SIZE 0805 VR1 20K SINGLE TURN POTENTIOMETER C1 16MH547M6357 RUBYCON 47µF 16 VOLT ELECT...

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