Driver Board Unit Component Repair - Epson DFX-8000 Service Manual

Driver Board Unit Component Repair

Table 5-4. Driver Board Unit Component Repair
Problem Symptom
An error is Carriage error is The home
detected. detected.
Short circuited
fan transistor.
Print head driver The print head
abnormal.
5-20
Checkpoint
Verify that connectors CN4
position cannot and CN5 are properly
connected.
be detected.
Observe the CR motor drive
The CR motor
signal at pins 30 and 31
driver is bad.
(CRA and CRB) of
connector CN6 (see Figure
5-1 4).
The fan transistor Check transistors Q2
(FANCOM), Q3 (HFANB)
is bad.
and Q5 (HFANA) for shorts
or opens.
Examine pins 24 (HP ERR)
driver is bad. and 23 (HN ERR) of
connector CN4, and check
on which of the two rows of
the head driver the error
of the six error detecting ICs
(DA1 - DA6; two sets, three
in one set) has detected
the error. If the printing is
not normal, replace the
driver ICs (28,4B, 2C, 4C,
is normal, replace the error
detecting
Solution
Check the
connector pins
of CN4 and CN5
and the route of
the CR HP
signal.
If abnormal,
replace the IC
(4E) or the
surrounding
element(s). tf
normal, check
the connectors
and the cables.
Replace the
corresponding
element(s).
Replace the
corresponding
element(s).