Epson Stylus Color 670 Service Manual

EPSON Stylus COLOR 670 Revision A
Troubleshooting Unit Repair (Power Supply Board) 57
3.2.5 Control panel operation is abnormal
Flowchart 3-5.
3.3 Unit Repair (Power Supply Board)
This section provides in-depth information for repairing the power supply
board so that you can repair the board to the small parts level. The table
below lists the probable causes for each symptom: you can select appropriate
symptom from the table and check each parts and its function as described in
the checkpoint.
Control
panel connected
correctly?
START
Connect the
control panel
correctly.
NO
NO
NO
YES
YES
YES
END
END
Is the
problem
solved?
Replace the
control panel.
Replace the
MAIN Board.
Control
panel connected
correctly?
Table 3-5. PSB Troubleshooting
Symptom Condition Cause Check point Solution
The printer
does not
operate at
all.
+42VDC
line does
not work.
F1 is open.
Check F1 is normal or not by
using a multimeter.
Replace
F1.
Trans T1 is
open.
Check T1 is normal or not by
using a multimeter.
Replace
T1.
FET(Q1) is
broken.
Check the drain waveform.
Replace
Q1.
Q2 or Q3 is
broken.
Check the collector wave.
Replace
Q2 or Q3.
PC1 is
broken.
Replace
PC1.

Epson Stylus Color 670 Specifications

General

Brand	Epson
Model	Stylus Color 670
Category	Printer
Language	English