Epson Stylus 1500 - Unit Repair - C172 Psb;Pse Board

UNIT REPAIR — C172 PSB/PSE BOARD
This section is necessary only for servicers who repair to the component level. Servicers who
perform only board replacement (including all U.S. servicers) can ignore this section. The table
below lets you troubleshoot problems with the power supply board (C172 PSB/PSE). The table
provides various symptoms, likely causes, and checkpoints. Checkpoints include waveforms,
resistances, and other values to be checked to evaluate the operation of each component.
Table 5-5. Repair of the C172 PSB/PSE
The printer
does not
operate at all
+42 V line
is dead
F1 is open.
Check whether F1 is normal
or not.
Replace F1.
Transformer
(T1) is open.
Check the coils for transformer
using a multimeter.
Replace T1.
Switching
FET(Q1)
is dead.
Check the waveform at drain of Q1
Replace Q1.
Q2 or Q3
is dead.
Check the waveform at corrector
of Q2 or Q3.
Replace Q2 or
Q3.
PC1 is
dead.
Check the pin 5 or 7 waveform of PC1.
Replace PC1.
+5 V line is
dead.
Check the pin 5 waveform of L4962.
Regulator
IC L4962
is dead.
Check the pin 7 waveform of L4962.
Replace L4962.
Replace L4962.
Symptom
Condition
Cause
Checkpoint
Solution
Troubleshooting
EPSON Stylus 1500 Service Manual 5-11