Electrical Adjustments
SM3226-1 – 10FEB97
5–31
No Film Signal Holding Time
To Check:
[1] Disconnect J218 from the DRIVER BOARD. J218 is the flat cable that connects to the SEQUENCE BOARD.
[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
±
5 ms. at TP
L:D1, LD2, and LD3.
• The tool consists of an 8-PIN DIN CLIP with a
0.01
µ
f CAPACITOR across pin 1 and pin 6.
[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.
Sensor
Symbol
To observe waveform, place
oscilloscope between GND and
PROBE
To adjust waveform
period, rotate
Slow Scan Sensor
IL1
CPG5
PHT2
VR10
Film Processor
Adapter Sensor
IL2
CPG5
PHT3
VR11
Transport Sensor
IL3
CPG5
PHT1
VR12
U14
1
2
3
4
5
6
7
8
H129_1928AC