Service manual

Page 4-6
Section 4. Electric Checks and Adjustments
PN 9001080
Rev. A
SATO M-8485Se Standard Print Engine
Service Manual
4.5 Ribbon Sensor Adjustment
STEP PROCEDURE
1. Loosen (2) screws holding the service board access cover to the rear of the
cabinet. Slide off the cover for access to the service board. Fig. 4-1
2. Connect the printer AC power cord to a grounded AC outlet. Place the power
switch in the OFF position.
3. Go to the input screen on display panel.
4. LOW LEVEL (No Slit) ADJUSTMENT
Turn the ribbon unwind boss slowly so that no slit is in view of the sensor.
Adjust VR3 on the Service PCB to 0.3 - 0.5V. Fig. 4-6
5. HIGH LEVEL (With Slit) ADJUSTMENT
Turn the ribbon unwind boss slowly so that the slit is in centered on the
sensor. Check that the difference between the high and low level is 2.0V or
higher. If the voltage reading is less than 2V repeat step 4.
6. After performing tests, replace the access cover.
Required Equipment:  DC Voltmeter
 Small Phillips screwdriver
(for potentiometer adjustments)
VR3 on the Service PCB is used.
To adjust the Ribbon Sensor voltage, perform the following steps:
ADJUST VR3 ON
SERVICE BOARD
4-6
Fig.
ADJUST VR5
ON MAIN PCB
TO MIDPOINT
IF NECESSARY