Epson DFX 8500 Service Manual page 185

TROUBLESHOOTlNG
Table 56. C204 MANDRVIDRV-B boards Component Repair 2/1
Symptom Cause Checkpoint Solution
The printer does
The control ROM is
Confirm that the PROM is inserted the
Replace lC5.
not operate at all. defective. socket correctly.
The gate array (El) Check pin 86 (DO)of ICl for a change Replace
ICl
is defective.
in the signal (HIGH or LOW).
The CPU (IC2) is
defective
Look at the oscillator at either pin 27 Reolace CRUl or
(xl) or pin 28 of the CPU.
1 ici
The DRAM (IC14) is Observe pin 2 (DO) of IC14 for a Replace IC14.
defective
change in the signal (HIGH or LOW).
Rev. A
5-17