Service manual

ManualsBrandsEpson ManualsPrinterStylus Photo 1270

EPSON Stylus Photo 870/1270 Revision B

TROUBLESHOOTING Overview 70

Table 3-13. PF Motor does not Work

Step Checkpoint

Action

1 Getting ready

for checking

waveforms.

Using an oscilloscope, check the outputwaveform at

CN13 (PF motor connector) on the main board. For

checking, press the Load/Eject button to drive the PF

motor.

NOTE:

Be sure to disconnect the PF motor cable.

NOTE:

Ground one of the probes to the frame. The

connector itself has no ground line since the

PF motor is a bi-polar motor.

2 Checking the

waveform to

solve the

problem.

Drive the PF motor and check that the waveform

shown below is output from each pin of CN13.

• If the waveform appears as shown, replace the PF

motor.

• If not, replace the main control board or the PF

motor driver IC (IC19).

20V

Table 3-14. Pump/ASF Motor does not Work

Step Checkpoint

Action

1 Getting ready

for checking

waveforms.

Using an oscilloscope, check the outputwaveform at

CN7 (Pump/ASF motor connector) on the main

board. For checking, press the Load/Eject button to

drive the Pump/ASF motor.

NOTE:

Be sure to disconnect the

Pump/ASF

motor cable.

NOTE:

Ground one of the probes to the frame.

The connector itself has no ground line

since the PF motor is a bi-polar motor.

2 Checking the

waveform to

solve the

problem.

Drive the Pump/ASF

motor and check that

the waveform shown at

right is output from

each pin of CN7.

• If the waveform

appears as shown,

replace the Pump/

ASF motor.

• If not, replace the

main control board or

the Pump/ASF motor

driver IC (IC12).