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World of Ham Radio 1997
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r7000_17.doc
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1997-02-01
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R7000.17
Time:
2 to 4 hours
II Preparation
Read this document completely. Select a smooth surface
to work on such as an antistatic mat or a towel spread
on a table. Put the R7000 in front of you with all the
equipment you will need at reach. The receiver must be
unplugged. For safety reasons and protection of your
equipment it is advisable that you leave the ICOM
unplugged for a couple of hours to allow components to
cool and capacitors to discharge. Take off the front
panel and the bottom panel as described in the exploded
views of the service manual. Disconnect and take off
the logic board (remember the connector positions).
Disconnect and take off the SW3 board it may require
disconnecting other boards.
III The memory module
Locate IC8 on the logic board. It is the chip with the
battery on top of it. Locate pin 19. Use the reference
in the service manual to find the correct pin labeled
A10 (page 7-9).
Top view of IC8
1 24
o U o
o o
o o
o o
o o
o o <- 19
o o
o o
o o
o o
o o
o o
Now think on how difficult it will be to unsolder pin
19. If you think it is beyond your skills, get help.
Unsolder pin 19 and use a pair of small pliers to pull
it out of it hole. Make sure it does not touch the
transistor nearby. solder a wire to pin 19. this wire
must be long enough to reach the front panel later on.
When this is done, verify that pin 19 is not in contact
with anything (you may want to isolate it). You have
done the most difficult part of the modification.
CONTINUED IN R7000.18