Epson DLQ-3000 Service Manual page 149

DLQ-3000+
Use a multimeter to check the motor coil resistance and transistor continuity, as shown in Table 5-
5, Table 5-6 and Table 5-7.
Connector No. Common
CN4
(CR motor)
CN4
(PF motor)
CN4
(PG motor)
CN3
(Ribbon motor)
Transistor No.
Q6 to Q33
Sensor connector
No.
CN3
(Color ribbon
cartridge sensor)
CN3
(Rear paper sensor)
CN5
(PGHP sensor)
CN5
(Release sensor)
CN5
(Adjust switch)
CN14
(Interlock switch)
5-10
Table 5-5. Motor Coil Resistance
Test pin
pin No. No.
5,6 1,2,3,4
17 13,14,
15,16
7,8 9,10,
11,12
7 8, 9,
10, 11
Table 5-6. Printhead Driver Test Point
Test method
(With the printer power off, and set the
multimeter to or diode check mode.)
Connect the leads to the base and collector
or emitter, then reverse the lead.
Table 5-7. Sensor Test Point
Test method
(With the printer power off, and set the
multimeter to or diode check mode.)
Place 1 lead on pin 13 and the other on the
ground; then install the color ribbon cartridge
to the CR unit.
Place 1 lead on pin 16 and the other on the
ground; then activate the sensor actuator.
Place 1 lead on pin 22 and the other on the
ground; then activate the sensor actuator.
Place 1 lead on pin 20 and the other on the
ground; then change the release lever setting.
Place 1 lead on one of the pins from 9 to 12
and the other on the ground; then change the
adjust switch setting.
Place 1 lead on pin 1 and the other on the pin
2; then open and close the printer cover.
Test method
Place 1 lead on pin 5 or pin 6,
and set the other on each
terminal of the 4 phases.
Place 1 lead on pin 17, and set
the other to each terminal on the
4 phases.
Place 1 lead on pins 7 and 8, and
set the other on each terminal of
the 4 phases.
Place 1 lead on pin 7, and set the
other to each terminal on the 4
phases.
Normal value
Approximately
1.1
(at 25° C)
Approximately
5.0
(at 25° C)
Approximately
250
(at 25° C)
Approximately
76
(at 25° C)
Meter reading
Neither open or close
completely.
Meter reading
Meter should toggle
between open and
short.
Meter should toggle
between open and
short.
Meter should toggle
between open and
short.
Meter should toggle
between open and
short.
Meter should toggle
between open and
short.
Meter should toggle
between open and
short.
Rev. A