Epson Stylus COLOR 440 Service Manual page 85

EPSON Stylus COLOR 440, 640, and 740
Symptom Condition
(Continued) +5V line is dead.
The printer does
not operate at all.
Table 3-5. Repair of the C206/C257 PSB/PSE Board (continued)
Cause
IC51 (L4962E/FA3635P) is
defective.
Note:
• L4962 is used for Stylus
COLOR 440/640.
• FA3635P is used for
Stylus COLOR 740.
IC51 (L4962E/FA3635P) is
defective.
Note:
• L4962 is used for Stylus
COLOR 440/640.
• FA3635P is used for
Stylus COLOR 740.
Checkpoint
Stylus COLOR 440/640 only:
• Check the sawtooth
waveform at Pin 5 of
IC51.
Stylus COLOR 740
• Sawtooth waveform
not measurable.
Stylus COLOR 740:
• Check the switching
waveform at pin 7 of
IC51.
Stylus COLOR 740:
• Check the switching
waveform at Pin 8 of
IC51.
Chapter 3 Troubleshooting
Solution
Replace IC51.
Replace IC51.
76