Epson DFX-8000 Service Manual page 241

Problem
Symptom
Host computer
A data
cannot make it communication
operate
error is detected
properly.
or data is
garbled.
Mode settings The memory
are not saved. backup is not
performed.
Checkpoint
The interface Observe the interface signal
elements are bad. causing the error while
communicating with the host
computer.
Parallel I/F
l
DATA 1 - 8,
STROBE, ACK, BUSY
Serial I/F
l
The CPU is bad.
good, the CPU may be bad.
The memory The lithium battery or the
transistor (Cl3 and Q4) in the corresponding
backup circuit is
bad. memory backup circuit is
bad.
Troubleshooting
Solution
Replace the
parallel port IC
(6A or 2E).
Replace the
serial port ICs
and 2E).
Replace IC (5E)
Replace the
element(s) or
the surrounding
element(s).
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