Epson DLQ-3000 Service Manual page 113

Table 5-9. BOARD ASSY.,C124 MAIN Repair (Continued)
Phenom-
Trouble
enon
The
control
The
panel
does not switches,
LCD or
operate
normally. LEDsof the
Including control
abnormal panel are
DIP not working.
switch
settings.
The host
Data
computer
transmission
cannot
error is
execute
displayed or
normal
data is
printer
operation.
The mode Memory
back-up is
settings
are not not
stored. available
Cause
When the switches, LCD or LEDs are not
The
available, the G.A of the Panel circuit
control
board is bad. Otherwise, replace the
CPU: IC1O, if the problem is not solved
off even after replacing the IC concerned.
circuit is
Check the cable and connector
bad.
connections of the control panel.
Check the interface signals related to the
The error while communicating with the host
interface
computer.
Parallel IIF: DATA1 to DATA8, STROBE,
is bad. ACK, BUSY.
Serial l/F: TXD, RXD, DTR
If all the interface components are
The CPU
normal, the CPU: IC1O or the ICS
is bad.
12,13,17,18 maybe bad.
Abnormal
writing to The EEPROM IC16 or the CPU IC1O
the may be bad.
item to Check
Troubleshooting
Troubleshooting
Replace the
components
concerned.
Parallel I/F:
Replace the
BOARD ASSY.,
MAIN.
1
and the
peripheral
components.
Replace the
BOARD
Replace the
BOARD ASSY.,
MAIN.
Otherwise
replace IC16
6-17