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No Film Signal Holding Time
Sensor
Slow Scan Sensor
Film Processor
Adapter Sensor
Transport Sensor
To Check:
[1] Disconnect J218 from the DRIVER BOARD. J218 is the flat cable that connects to the SEQUENCE BOARD.
1
2
3
4
[3] Connect the Channel A OSCILLOSCOPE PROBE to the correct TEST POINT:
IL1: PHT2 for the SLOW SCAN FILM SENSOR
IL2: PHT3 for the FILM PROCESSOR ADAPTER FILM SENSOR
IL3: PHT1 for the TRANSPORT GUIDE PLATE FILM SENSOR
[4] Energize the LASER PRINTER.
SM3226-1 – 10FEB97
To observe waveform, place
oscilloscope between GND and
Symbol
IL1
CPG5
IL2
CPG5
IL3
CPG5
U14
8
7
6
5
H129_1928AC
PROBE
PHT2
PHT3
PHT1
[2] Connect the PULSE CYCLE TEST TOOL, TL-
4715, to IC U14.
Note
• U14 pin 1 and pin 6 must be connected to the TL-
4715 capacitor.
• You must use TL-4715 to obtain 30
L:D1, LD2, and LD3.
• The tool consists of an 8-PIN DIN CLIP with a
µ
0.01
f CAPACITOR across pin 1 and pin 6.
Electrical Adjustments
To adjust waveform
period, rotate
VR10
VR11
VR12
±
5 ms. at TP
5–31
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