Appendix A - Replacing Software Eprom; Access The Transmitter Unit; Access The Pcb - ABB 8235 Chloride Instruction Manual

APPENDIX A – REPLACING SOFTWARE EPROM
Warning. Switch off the monitor and electrically
isolate it before carrying out the following steps.
A.1 Access the Transmitter Unit – Fig. A.1
Caution. Employ normal antistatic precautions
while handling chips and PCBs.
Caution. To avoid damaging EPROM, base or
PCB, it is essential that you use an approved IC extractor in
this procedure.
For example, a PLCC Extractor, RS Stock Number:
404-727
Hinged Case
Microprocessor Unit
Open microprocessor unit –
2
see Fig. A.2.
Fig. A.1 Procedure to Open the Enclosure
38
Undo locks and
swing open the case
1
to reveal the
microprocessor unit.
A.2 Access the PCB – Fig. A.2
Unlock and open cover plate and
hinge out to expose captive
screws.
Remove processor PCB.
3
See Fig. A.3
Fig. A.2 Procedure to Access the Processor PCB
1
2
Unscrew captive screws and
swing front cover upwards. Lock
into position using the hinged
stay on the right hand side.