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36 • Maintenance / Adjustments Users Manual Model 656/636
Reflective Index Registration Sensor
Sensor on Plain Stock;
Not on Mark
Sensor Directly on
Mark
Test Point:
TP8 TP8
Adjustment Pot
R47 R47
#4 Light Status:
On Off
Desired Voltage:
> 3.50 VDC < 0.75 VDC
The Optional Reflective Registration Sensor, if installed, allows the printer to
register to preprinted media by detecting a black mark. Begin by placing the stock
so that the black mark is not in the sensor's sight path and adjust the pot until the
high value is achieved. Then place the stock so that the black mark is directly in
front of the sensor's sight path and adjust until the low level is met. The low level is
the more crucial of the two adjustments.
NOTE: The same pot is used for both adjustments and a compromise value must be
achieved.
Film Out Sensor / Top Ink Sensor
Sensor Blocked Sensor Not Blocked
Test Point:
TP12 TP12
Adjustment Pot
R50 R50
#1 Light Status:
On Off
Desired Voltage:
> 3.50 VDC < 0.75 VDC
The Film Out Sensor allows the printer to monitor the availability of ink. Begin by
blocking the sensor with the ink intended for use and adjust the pot until the high
value is achieved. Then remove the ink from the sensor and adjust until the low
level is met. The low level is the more crucial of the two adjustments.
NOTE: The same pot is used for both adjustments and a compromise value must be
achieved.
Bottom Ink Sensor
Sensor Blocked Sensor Not Blocked
Test Point:
TP16 TP16
Adjustment Pot
R49 R49
#2 Light Status:
On Off
Desired Voltage:
> 3.50 VDC < 0.75 VDC
The Bottom Ink Sensor is not available at this time and is reserved for future
expansion.