Epson Stylus Color 1520 Service Manual page 127

EPSON Stylus COLOR 1520
5.4 Repairing Components on the C211 Main Board
This section provides information for repairing and replacing defective components on the C211-B main
board. Table 5-6 and 5-7 list the causes for each symptom in order of most likely possibility.
Table 5-6. Component Repair of the C211 Main Board (1)
Symptom Condition
The printer The CPU
does not doesn't
operate at all. operate.
The driver
mechanism
doesn't operate
properly at
power on/off.
5-10
Check the output waveform at pin 7.
Cause Checkpoint
Reset circuit is Check /RESET signal at pin 1
defective. and 5 V line at pin 3 of IC1.
Selection of ROM Check /CS1 (pin 1) and /CS2
and sub gate array (pin 2) on the CPU (IC7) for
is abnormal. changes in HIGH and LOW.
CG-ROM or PROM is defective.
CPU is defective. Check the signal form of the
XTAL (pin 85) and EXTAL (pin
86) of the CPU (IC7).
Solution
Replace the main
board or the reset IC.
Replace the main board.
Replace the main
board or PROM.
Replace the main
board or CRU1.