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187
TRANSISTOR (Q1)
Service Check
1.
2.
3.
4.
5.
6.
Power off.
Separate the printer from power supply board A 1
(115).
Remove the gray safety cover.
Disconnect the 3 transistor leads from the pins on
board A 1 (189).
Set up a CE meter to the R x 1000 scale.
Measure the resistance in both directions on each
pair of leads (collector and base, collector and
emitter, and emitter and base).
7.
A good transistor has at least 10 times the
resistance in one direction as in the other direction
for all 3 pairs of leads. (Change the resistance
scale if needed to verify the readings.)
8.
Reconnect the transistor leads to the pins on
board A 1 (189).
9.
Complete the procedure by replacing the transistor
(see below) or by reversing this procedure.
186,187
Remove, Replace,
Adjust
•
Removal and Replacement
1.
2.
3.
4.
5.
Separate the printer from power supply board A 1
(115).
Remove the gray safety cover.
Remove the 2 screws" from the transistor.
Pull the transistor from the socket. An insulating
washer will fall out also.
Replace the transistor by reversing this procedure.
Always install a new insulating washer with the
new transistor.
Maintenance
5256 MIM
1-65
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