Epson DFX-8000 Service Manual page 240

Table 5-5. Main Board Unit Component Repair (continued)
Problem Symptom
An error is Short-circuited
detected. fan transistor.
Print head driver The CPU is bad.
abnormal.
Printing is not
The print head
normal. is not controlled
correctly.
The CR motor is The CR motor
not controlled
correctly.
Paper feeding is The PF motor is
not normal. not controlled
correctly.
DIP switches The specified
cannot be set. values of the
DIP switches
cannot be read.
Control panel
The switches
doesn't operate and/or LED of
correctly. the control panel
do not work.
5-26
Checkpoint
The detecting Replace IC (6A). Check the
route of the HF ANA and HF or IC (5E).
circuit is bad.
ANB signals.
Check if an error signal has
been input at pin 32 (HP
ERR) or pin 33 (HN ERR) of
IC (5E).
If not, check the signal
l
route.
The print head Replace
control circuit is doesn't work, replace the
bad. C.G. ROM:IC (3B) or the
CPU.
Verify that the drive signal of Replace the
control circuit is the CR motor is correctly
bad. output at pins 16 (CR A)
through 19 (CR D) of CN5.
The CR motor is
l
controlled by the CPU:IC
the driver IC (7A).
The CPU is bad.
Verify that the PF motor
drive signal is correctly
output
through 29 (PF A) of the
5-l 9).
The PF H/R signal is
l
output from the G.A.:
IC (2E).
The DIP switch Replace IC (2E). If it still
reading circuit is
bad.
When only a particular bit
l
is involved, replace the
DIP switch and the diode
for that bit.
Gate array is bad. Replace IC (2E). If it still
doesn't work, replace the
. Check the continuity of
the cables and
connectors on the control
panel.
Solution
Replace IC (6A)
Replace IC 5E.
IC
(6A). lf it still Replace the
corresponding
element(s).
corresponding
element(s).
Replace the
corresponding
at
pins 26 (PF D) element(s).
Replace the
corresponding
element(s).
Replace the
corresponding
element(s).