Adjustment; Mts And Dts Sensor Board Adjustment - Epson LQ-1500 Service Manual

4.4 Adjustment

4.4.1 MTS and DTS sensor board adjustment

Adjust the MTS sensor board if sensor board has changed.
Special Tools: Synchroscope
Turn off the power.
STEP 1:
STEP 2: Remove the upper case.
Remove the printer mechanism.
STEP 3:
Remove the UXDRV board.
STEP 4:
STEP 5: Connect the extension cable
Scope set:
STEP 6:
CH1:
TIME: 200 uset
Note: Resistance R35 is near the IC '5C'.
STEP 7: Turn off Dip switch 2 - 7 on the interface board so that it is in DRAFT mode.
STEP 8: Set the paper and execute self-print-test. Check the following waveform.
If the waveform is not the same as above, go to stop 10.
STEP 9:
If the waveform is same as above, then skip to STEP 13.
STEP 10: Loosen the setscrew (CP(P) M2.5 x 4) of the MTS sensor board.
STEP 11: Move the PTS sensor board in the direction of the arrow to adjust T1 cycle to be almost
equal for both travel courses.
Extension cables (2 types)
MTS signal (One side of resistance R35 on the UXMCL board)
Fig. 4.17 Adjustment of the MTS sensor position
Fig. 4.16 MTS
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