UBI EasyCoder 501 SA, Руководство по обслуживанию

Страница: 40 / 214

UBI EasyCoder 501 – Service Manual
40
7.4
Ribbon End Sensor,
cont'd.
7. TRANSFER RIBBON MECHANISM, cont'd.
The intensity of the light emitted from the sensor is controlled by a
strap on P-604 on the CPU board:
Strap fitted = higher intensity
Strap removed = lower intensity
The sensitivity of the receiver is controlled by the potentiometer
WR-601 on the CPU board.
Before adjusting the sensor, check that the sensor and the mirror are
clean and free from obstructions.
A simple program can be used to check the ribbon end sensor, e.g.:
10 'RIBBON END SENSOR TEST
20 'INTERRUPT PROGRAM BY TYPING "X"
30 BREAK 1,88:BREAK 1 ON
40 ON BREAK 1 GOSUB 1000
50 IF (PRSTAT AND 8) THEN SOUND 100,50 ELSE BEEP
60 GOTO 50
70 END
1000 BREAK 1 OFF
1010 GOTO 70
RUN
Remove the transfer ribbon from the sensor's beam of light (e.g. by
pulling out a loop) and run the program. The printer should emit a
low sound.
Put back the ribbon into the beam and the printer should start to beep
with a high-pitch tone.
If the printer does not behave as described, remove the left-hand
cover and, with the power still on, turn the potentiometer marked
“R-END” (WR-601) at the upper edge of the CPU board back and
forth. If that does not help, fit or remove the jumper on P-604.
If the sensor refuses to work, consider the possibility that the mirror
plate may be bent before discarding the sensor.