Page 36 13900-103 Rev. A
Repair 4
Power I/O Circuit Board Replacement
This section details the steps necessary to remove/
replace the power I/O board.
CAUTION: THE INTERNAL CIRCUITS OF THIS INSTRUMENT
HAVE ELECTROSTATIC DISCHARGE SENSITIVE
DEVICES (ESDS) AND ARE SENSITIVE TO STATIC
HIGH VOLTAGES STORED IN AND TRANSFERRED
BY THE HUMAN BODY. OBSERVE CORRECT ESDS
PRECAUTIONS OR PREMATURE MALFUNCTION
OF THIS INSTRUMENT WILL OCCUR.
Special Tools and Equipment
Dow Corning* RTV 732 Multi Purpose Sealant
Power I/O Board Removal
Refer to Figure R4-1 for the layout of the circuit board.
1. Disconnect the earth ground connection from under
the Tonometer Head.
2. Disconnect the power connector (J13) at the Power
I/O Board (referred to as PIOB) which connects to the
Tonometer Head.
3. Disconnect the data harnesses (J11) and the power
harness (J6) on the PIOB which connects to the Motor
Board.
CAUTION: DO NOT TO CUT INTO THE WIRES WHICH SECURE
THE WIRES TO THE XYZ POSITIONING SYSTEM.
4. Cut the plastic wire tie which secures the transformer
and ground wires to the XYZ Positioning Assembly.
5. Remove the four screws, washers, and nuts which
secure the XYZ Positioning Assembly to the Mounting
Base. Seperate the XYZ Positioning Assembly (and
Tonometer Head assembly) from the Base Casting.
Set the XYZ Positioning Assembly on its side next to
the Base Casting.
6. Disconnect the power connector (J3) and the data
harness (J8) at the PIOB which connects to the LCD
screen.
6. Disconect the power connector (J10) and the data
harness (J12) at the PIOB which connects to the
Printer Assembly.
7. Disconnect the power connector (J5) at the PIOB
which connects to the Transformer.
8. Disconnect the data harness (J7) at the PIOB which
connects tothe Keypad Assembly.
9. Remove the two stand-offs, and lock washers which
secure the 9-pin computer interface connector to the
Power Identification Panel.
10. Remove the three screws which secure the PIOB to
the Base Casting.
11. Remove the Power I/O Board from the Base Casting.
- Continued -
Figure R4-1, Connector Locations
* Dow Corning is a registered trademark of Dow Corning
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