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SERVICE MANUAL
Clock Frequency for Electromagnetic Pump
Use this procedure to check the vacuum pressure and the clock frequency for the ELECTROMAGNETIC PUMP
when the film suction is malfunctioning.
[4] Connect a 10X Probe TL-2074 to the Channel A input of the Oscilloscope TL-3348.
[5] Set the Volts/Div. to 2.0 V.
[6] Set the Sec/Div. to 5 msec.
[7] Connect the GROUND CLIP of the OSCILLOSCOPE PROBE in Channel A to CPG5 on the DRIVER
BOARD.
[8] Connect the 10X OSCILLOSCOPE PROBE in Channel A to CPCK on the DRIVER BOARD.
[9] Energize the LASER PRINTER.
[10] Observe the waveform on the OSCILLOSCOPE. The clock frequency should be 55 ± 3 Hz. One cycle should
be between 17 ms and 19 ms.
To Adjust:
[11] Rotate POTENTIOMETER VR6 until the wave cycle is within specification.
5–22
Close the MAGAZINE WINDOWS or remove the
MAGAZINES before doing this adjustment.
To Check:
[1] De-energize the LASER PRINTER.
[2] Remove the BACK IMAGE UNIT COVER. If
SEQUENCE
necessary, see the procedure on Page 2–3.
BOARD
[3] Open the SEQUENCE BOARD SHIELD.
SHIELD
H129_0601ACA
H129_0601AC
Caution
10FEB97 – SM3226-1
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