Epson DFX 8000, Service Manual

Page: 240 / 292

Table 5-5. Main Board Unit Component Repair (continued)
Problem Symptom Checkpoint Solution
An error is Short-circuited The detecting Replace IC (6A). Check the Replace IC (6A)
detected.
fan transistor. circuit is bad. route of the HF ANA and HF or IC (5E).
ANB signals.
Print head driver The CPU is bad. Check if an error signal has Replace IC 5E.
abnormal. been input at pin 32 (HP
ERR) or pin 33 (HN ERR) of
IC (5E).
l
If not, check the signal
route.
Printing is not The print head
The print head
Replace
IC
(6A). it still Replace the
normal. is not controlled control circuit is doesn’t work, replace the corresponding
correctly. bad. C.G. (3B) or the element(s).
CPU.
The CR motor is The CR motor Verify that the drive signal of Replace the
not controlled
control is the CR motor is correctly
corresponding
correctly. bad. output at pins 16 (CR A) element(s).
through 19 (CR D) of CN5.
l
The CR motor is
controlled by the
and
the driver IC (7A).
Paper feeding is The PF motor is
The CPU is bad.
Verify that the PF motor Replace the
not normal. not controlled drive signal is correctly corresponding
correctly. output
at
pins 26 (PF D) element(s).
through 29 (PF A) of the
(5E) (see Figure
5-l 9).
l
The PF signal is
output from the G.A.:
IC (2E).
DIP switches The specified
The DIP switch Replace IC (2E). it still
Replace the
cannot be set. values of the reading circuit is work, replace the corresponding
DIP switches bad. (5E) or the element(s).
cannot be read. (38).
l
When only a particular bit
is involved, replace the
DIP switch and the diode
for that bit.
Control panel The switches Gate array is bad. Replace IC (2E). If it still Replace the
doesn’t operate and/or LED of doesn’t work, replace the
corresponding
correctly. the control panel (5E) or the
element(s).
do not work. (38).
. Check the continuity of
the cables and
connectors on the control
panel.
5-26