Xerox Phaser 7760 Service Manual page 171

009-351 Accumulator Belt Drive Logic Fail
The IBT Edge Sensor detected that the IBT Belt is not tracking correctly.
If the Accumulator Belt is damaged, determine the cause of the damage before installing a new
assembly.
Troubleshooting References
Table 1 References
Applicable Parts Parts List Wiring and Plug/Jack References
Drive Assembly - Steering PL 1.3
Accumulator Belt Assembly PL 5.2
I/F PWB PL 9.1
Engine Control Board PL 13.1
(MCU PWB)
Troubleshooting Procedure
Table 2 Procedure
Step Actions and Questions
1 1. Remove the Accumulator Belt Assem-
bly.
2. Inspect the DTS Connector for dam-
age.
3. Is the connector damaged?
2 Is the Edge Sensor Actuator touching the
Belt?
3 Is the mating connector inside the printer
damaged?
4 1. Reinstall the Accumulator Belt Assem-
bly.
2. Enter Service Diagnostics Menu:
Printer Menu > Troubleshooting >
Service Tools > Printer Status Page
> hold the Up and Down buttons
simultaneously > Run Service Diag-
nostics > OK. Run the Belt Edge
Sensor test.
3. Is the result OK?
Revised
Phaser 7760 Color Laser Printer
CAUTION
Section 7, I/F PWB, Main Motor, LVPS T11 Plug/Jack
Locations - Figure 16
Section 7, Engine Control Board (MCU PWB) Plug/
Jack Locations - Figure 15
Yes No
Replace the Accu- Go to step 2.
mulator Belt Assem-
bly (REP 9.15).
Replace the Accu- Go to step 3.
mulator Belt Assem-
bly (REP 9.15).
Repair or replace Go to step 4.
the wiring harness
between the con-
nector and J605.
Go to step 5. Run the Belt Edge
Learn and recheck.
If it still fails, go to
step 8.
Step Actions and Questions
5 1. Switch the printer power On.
2. Remove the Rear Cover.
3. Measure the voltage between the
Engine Control Interface Board and
J539A3(+) and frame ground.
4. Does the voltage measure between +1
to +3 VDC?
6 1. Measure the voltage between the
Engine Control Interface Board and
J539A-1 and frame ground.
2. Does the voltage measure +5 VDC?
7 1. Measure the voltage between the
Engine Control Interface Board and
J539A-2 and frame ground.
2. Does the voltage measure +5 VDC?
8 1. Remove the Accumulator Belt Assem-
bly.
2. Enter Service Diagnostics and run the
Steering Motor test.
3. Does the Motor turn?
9 1. Measure the voltage between the
Engine Control Interface Board J537-6
and frame ground.
2. Is the voltage +24 VDC?
January 2010
2-135
Table 2 Procedure
Yes No
Go to step 8. Go to step 6.
Go to step 7. Replace in the fol-
lowing order:
1.
2.
Replace in the fol- The Edge Sensor is
lowing order: defective, replace
1. Engine Con- the Accumulator
trol Interface Belt Assembly
Board (REP 9.15).
1.8)
2. Engine Con-
trol Board
(MCU PWB)
(REP 1.2)
Replace the Accu- Go to step 9.
mulator Belt Assem-
bly (REP 9.15).
If the problem is
unresolved, replace
the Engine Control
Board (MCU PWB)
(REP 1.2).
Go to step 10. Replace in the fol-
lowing order:
1.
2.
Status Indicator RAP's
Engine Con-
trol Interface
Board (REP
1.8)
Engine Con-
trol Board
(MCU PWB)
(REP 1.2)
(REP
Engine Con-
trol Interface
Board (REP
1.8)
Engine Con-
trol Board
(MCU PWB)
(REP 1.2)
009-351