Service manual

PT300, Service Manual
Rev B, October, 2000
29
Remove and replace main circuit board
Tools required
Twenty thousand pound calibration press.
8" x 8" x 2 ± .25” aluminum loading block.
8" x 8" x 0.5" rubber loading pad.
Static dissipation station.
#2 Phillips screwdriver for bezel and board mounts.
Small slotted blade screwdriver.
Torque-seal potentiometer shaft sealer.
Caution:
The following procedure must only be performed at a static controlled workstation. The
main printed circuit board is subject to damage by electrostatic discharge.
Disassembly
1) Remove all 10 bezel screws.
2) Detach keyboard assembly, unplug keyboard connector and set aside.
3) Remove 2 screws holding circuit board.
4) Remove main circuit from housing.
5) Unplug harness connector.
Assembly
1) Plug printed circuit into harness connector.
2) Place circuit board into housing. Be careful not to pinch the wires between
the battery tube and the printed circuit board.
3) Install two board mounting screws.
4) Plug in keyboard.
5) Check and adjust calibration as needed.
6) Align keyboard on housing.
7) Install 10 bezel screws.