Super Spiro - Service Manual
056-09 Issue. 1.0 November 1999
Contents
Exploded isometric view Page 3
Parts list Page 4
System overview Page 5
Transducer Page 6
Disassembly instructions Page 7
Re-assembly instructions Page 8
Circuit description Page 9
Microprocessor circuit Page 9
Flash disk Page 10
Serial interface Page 10
Transducer interface Page 10
Frame store Page 10
FPGA Page 11
Keypad circuit Page 11
Real time clock circuit Page 12
Sound generator circuit Page 12
Printer control circuit Page 12
Expansion Page 12
Printer driver circuit Page 12
Technical support Page 13
Fault analysis Page 14
Circuit diagrams
Micro processor circuit Page 15
FPGA circuit Page 16
Keypad circuit Page 17
Real time clock circuit Page 18
Printer circuit Page 19
Printer driver 1 Page 20
Printer driver 2 Page 21
2
Exploded Isometric View
Item 15
Item 1
Item 10
Item 16
Item 8
Item 20
Item 21
Item 22
Item 12
Item 14
Item 23
Item 13
Item 9
Item 2
Item 11
Item 18
Item 9
Item 7
Item 4
Item 6
Item 17
Item 5
Item 3
Item 19
3
Parts List
ITEM No.
1 TOP MOULDING MLD5611A
2 BACK PANEL MLD5615C
3 SIDE PANEL MLD5615B
4 DISPLAY CABLE ASSEMBLY ASS5624
5 BOTTOM MOULDING MLD5612A
6 HINGE BLOCK MLD5618
7 DISPLAY FRONT MLD5613
8 DISPLAY BACK MLD5614
9 DISPLAY HINGE ASSEMBLY ASS5601
10 PAPER COVER MLD5617
11 CSK SELF TAPPING SCREW 9mm LONG SCR5604
12 SPEAKER SPKR100
13 SPEAKER COVER MLD5620
14 CONTRAST WHEEL MLD5621
15 SCREW COVER MLD5616
16 CSK SELF TAPPING SCREW 8mm LONG SCR5602
17 CSK SELF TAPPING SCREW 13mm LONG SCR5601
18 M3 MACHINE SCREW 6mm LONG SCR0306
19 CSK SELF TAPPING SCREW 18mm LONG SCR4700
20 DISPLAY LATCH MLD5619
21 DISPLAY LATCH BUTTON MLD5622
22 PRINTER MECHANISM PTR4200
23 THERMAL PRINT HEAD TPH3000
DESCRIPTION MICRO MEDICAL PT No.
4
Super Spiro - System Overview (Fig. 1)
The Micro Medical Super Spiro is a data recording spirometer consisting of a microcomputer
unit (1) incorporating a 1/4VGA colour LCD display, data entry keypad, RS232 serial interface and all
associated circuitry. It is supplied with a digital volume transducer (2), disposable mouthpieces,
transducer holder (3) and mains adapter (4). The Super Spiro is powered by a universal mains
adapter (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.
1
super
spiro
4
Micro
Medical
3
2
5
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 the swirl plates create a vortex, which 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 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
Volume proportional to the number of pulses
Flow proportional to the puse frequency
Rotating
vane
Volume = k X No. of pulses
Infra red
emitter
Infra red
detector
Swirl
plate
Flow = k / pulse period
Jewelled
bearing
6
Disassembling the Super Spiro for Repairs
Main Unit
1. Disconnect all mains power supplies
2. Remove paper roll and paper roll housing cover, and put to one side
We recommend that you use a Philip Number Zero screwdriver for the following
instruction.
3. Place the Super Spiro face down to remove the six screws (Item 19) in the lower moulding, and
put the screws to one side.
4. Turn the unit face up before easing the upper and lower mouldings apart.
5. Reconnect mains power supply
6. The Super Spiro is now ready for fault finding.
Display Console
1. Remove the 4 screw covers (item 15) and dispose of.
We recommend that you use a Philip Number Zero screwdriver for the following
instruction.
2. Remove the 4 screws (item 16) and put to one side.
3. Carefully remove the display front panel (item 7) and put to one side.
4. Carefully pull the display away from the display back moulding (item 8).
5. Unplug the 2 connectors from the main display.
6. The display backlight is now ready for replacement.
Display backlight replacement
DISPLAY (REAR VIEW)
CFL CONNECTOR INVERTOR BOARD
CFL UNIT
1. Place the display face down on a clean work surface
7
FIXING SCREW
I
T
KCS3224A CFL UN
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