Epson DFX 8000, Service Manual

Page: 234 / 292

Driver Board Unit Component Repair
Table 5-4. Driver Board Unit Component Repair
Problem
An error is
detected.
Symptom Checkpoint Solution
Carriage error is The home Verify that connectors CN4 Check the
detected. position cannot and CN5 are properly connector pins
be detected. connected.
of CN4 and
and the route of
the CR HP
signal.
The CR motor
Observe the CR motor drive If abnormal,
driver is bad.
signal at pins 30 and 31 replace the IC
(CRA and CRB) of
(4E) or the
connector CN6 (see Figure surrounding
5-1 4). element(s).
normal, check
the connectors
and the cables.
Short circuited The fan transistor Check transistors Q2
Replace the
fan transistor. is bad.
(FANCOM), Q3 (HFANB) corresponding
and Q5 (HFANA) for shorts element(s).
or opens.
Print head driver The print head
abnormal.
driver is bad.
Examine pins 24 (HP ERR) Replace the
and 23 (HN ERR) of
corresponding
connector CN4, and check
element(s).
on which of the two rows of
the head driver the error
Determine which
of the six error detecting
(DA1 DA6; two sets, three
in one set) has detected
the error. If the printing is
not normal, replace the
driver
and 4D). If the printing
is normal, replace the error
detecting
5-20