SERVICE MANUAL
5–48
10FEB97 – SM3226-1
Sequence Board
Beam Detector Signal Offset Voltage
Use this procedure when receiving 53 Beam Detect errors and/or replacing the SEQUENCE BOARD.
Note
This adjustment has been discontinued for SEQUENCE BOARDS labled with Cannon Part No. BH8-1266-03I to M
(1120 Serial No. Range 500895-502079 and 600307-602025) and BH8-1266-04 (1120 Serial No. Range 502080-
present and 602026-present).
To Check:
[1] De-energize the LASER PRINTER.
[2] Install the PORTABLE COMPUTER. See
“Using the Portable Computer” in the Diagnostic
Section.
[3] Remove the BACK IMAGE UNIT COVER. If
necessary, see the procedure on Page 2–3.
[4] Open the SEQUENCE BOARD SHIELD.
[5] Connect the DIGITAL MULTIMETER TL-3386 as follows:
• + side to CP14 on the SEQUENCE BOARD
• COM side to CP8 on the SEQUENCE BOARD.
[6] Energize the LASER PRINTER.
[7] Check that the voltage on the DIGITAL MULTIMETER is 0.75 Vdc
±
0.02.
To Adjust:
[8] Rotate POTENTIOMETER VR2 until the voltage is within specification.
[9] Remove MULTIMETER PROBES.
H129_0601AC
SHIELD
BOARD
SEQUENCE
H129_0601ACA