Epson DLQ-3000 Service Manual page 112

Troubleshooting
Table 5-9. BOARD ASSY., C124 MAIN Repair (Continued)
Phenom-
Trouble
enon
"Release
lever
operation
error"
Goes to
an error
state.
"Paper out
error"
Abnormal
printhead
control
Degraded
printing
copy mode ~d.
Abnormal
CR motor
control
Abnormal
Abnormal
PF motor
5-16
Cause
Measure the reference voltage of the
sensor (approx. 5V) at pin
The
detection If the voltage is normal, the CPU IC1 O is
circuit is
bad. the CPU, SENSOR ASSY.,LOAD and the
peripheral components are bad.
Measure the reference voltage of the
The
sensor (approx. 35V) at pin 63 of ICI O.
detection
If the voltage and the CPU are normal, :
circuit is
the SENSOR ASSY.,PEW and the
bad.
peripheral components are bad.
,
If a specific dot is bad, check the drive
transistor corresponding to the dot.
There are two types of drivers. The first
The type makes the pulse A and the other type
makes the pulse B. If the degraded dot
cannot be determined or the trouble is
control
mainly with the print density, replace
circuit is
bad.
the problem cannot be solved even after
replacing these, replace the BOARD
The
Check the HPW pulse inputtoIC11.
pulse B
generator See Figure 5-14.
circuit is
Check the control signal input to the CR
motor drive IC1.
The CR
There are three types of control signals;
motor
phase data, enable, and the reference
control
voltage. The phase data and enable are
s
transmitted by the CPU.
The current control is switched by G.A:
ICI 1 which switches IC1.
The PF
Check the control signal input to the PF
motor
motor drive IC21 and the common voltage
control
pin 11 of connector CN 4.
See Figure 5-15.
bad.
Item to Check
of ICI O.
62
Troubleshooting
Replace the
BOARD ASSY.,
MAIN.
Otherwise,
replace
SENSOR
the peripheral
component
Replace the
BOARD ASSY.,
MAIN.
Otherwise,
replace
SENSOR
the peripheral
component
Replace the
components
concerned.
Replace
the BOARD
Replace the
components
concerned.
Replace the
components
concerned.