Appendix C - Replacing Software Eprom - ABB 8242 Instruction Manual

APPENDIX C – REPLACING SOFTWARE EPROM
Warning. Switch off the monitor and electrically
isolate it before carrying out the following steps.
Caution. Employ normal antistatic precautions
while handling chips and PCBs.
1) Remove the screws from the electronics section front
panel and swing it open to reveal the printed circuit
boards (PCBs).
2) Remove the four screws that secure the two PCB
restrains to stand-off pillars and remove the restrains.
3) Disconnect the ribbon cable – see Fig. C1. Note that the
cable feeds in from the front of the board.
4) Carefully ease the processor board (see Fig. C1) from the
mother board.
5) Remove the software EPROM chip, preferably using an
extractor. This chip is the third from the top (the only
labelled chip – see Fig. C1).
Ribbon Cable
to Display and
Keypad
Microprocessor
Board – Ease out (step 4)
Unplug Ribbon Cable
(Step 3)
Fig.C1 8240 Electronics Section
6) Fit the replacement chip ensuring correct orientation in its
socket.
7) Complete the procedure as follows:
• Plug the PCB onto the mother board;
• connect the ribbon cable to the processor board;
• fit the PCB restraints and secure them using the
previously removed screws;
• close the electronics section front panel and secure it
using the previously removed screws.
8) The monitor may now be put into service.
9) Check program parameters – see instruction manual.
10) Carry out a routine 2-point calibration.
Software EPROM Chip.
Replace – steps 5 & 6
Motherboard
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