Epson Stylus Color 1520 Service Manual page 126

5.3 Repairing the C172 PSB/PSE Board at the Component
Level
This section contains information that enables you to repair and replace components on the electrical board
(C172 PSB/PSE). Table 5-5 lists the potential causes for each symptom in order of most likely cause, with
which you are able to find and repair the defective part.
Table 5-5. Component Repair of the C172 PSB/PSE Board
Symptom Condition
The printer +42 VDC is
does not not output.
operate at all.
+5 VDC is
not output.
Cause Checkpoint
Fuse F1 is Check to see if the fuse looks normal.
blown.
Transformer Check the transformer using a multimeter. Replace
(T1) is open.
Q1 is dead. Check the waveform at the drain.
Q2 or Q3 is Check the waveform at the corrector.
dead.
PC1 is dead. Check the voltage at pin 5 or 7.
L4962 is Check the reference waveform at pin 5.
dead.
Troubleshooting
Solution
Replace fuse
F1.
transformer T1.
Replace Q1.
Replace Q2 or
Q3.
Replace PC1.
Replace L4962.
5-9