Epson Stylus Color 670 Service Manual

EPSON Stylus COLOR 670 Revision A
Troubleshooting Unit Repair (Control Board) 58
3.4 Unit Repair (Control Board)
This section provides in-depth information for repairing C301MAIN 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.
The printer
does not
operate at
all.
+5VDC
line does
not work.
IC51(FA36
35P) is
broken.
Check the output waveform
(pin 8).
Replace
IC51.
Table 3-5. PSB Troubleshooting (continued)
Symptom Condition Cause Check point Solution
Table 3-6. Control Board Troubleshooting
Symptom Condition Cause Check point Solution
The
printer
does not
operate at
all.
CPU does not
work.
Reset
circuit is
broken.
Check +5VDC line (Pin 7
of IC5) and reset signal
(Pin 2 of IC5).
Replace
IC8.
ROM is not
selected
correctly.
Check that the waveform
of Pin 11 of IC3 reverses
High/Low.
Replace
IC3.
CPU is
broken.
Check the signal
waveform Pin 86 of IC1.
Replace
IC2.
5VײÝ
/RESET

Epson Stylus Color 670 Specifications

General

Brand	Epson
Model	Stylus Color 670
Category	Printer
Language	English