Diagnostic information
2-47
5060-00
x
125 Error code
Hot fuser
The printer detects a problem with the fuser running over temperature or the backup rolls have been on too long.
A problem could exist in the fuser assembly with the backup roll bearings, backup roll thermistor, or other backup
roll parts. The LVPS or engine board assembly may also be failing.
126 Error code
Hot roll thermistor or thermistor circuits are open
The printer detects a problem in the fuser hot roll, hot roll lamp circuits, fuser hot roll thermistor, engine board, or
LVPS fuser control circuits.
Step
Action and questions
Yes
No
1
Open the right fuser access door. Observe the fuser
and see if the backup roll lamp turns on and off. You
may have to observe the fuser for a few minutes.
Does the backup roll lamp turn off and on?
Go to step 2
Replace the LVPS
assembly. See
“Low voltage
power supply
(LVPS) removal”
on page 4-38
.
2
Turn the printer on and measure the voltage on
connector J10-12 on the engine board. The voltage
should measure approxi0.13 V dc to
+0.64 V dc as the hot roll lamp turns on and off.
Is the voltage correct?
Replace the fuser
assembly. See
“Fuser assembly
removal” on
page 4-31
.
Replace the engine
board assembly.
See
“Engine
board removal”
on page 4-29
.
Step
Action and questions
Yes
No
1
Turn the printer on and allow it to reach
Ready
.
Note:
The printer may not complete POR and post a
126 error message.
Remove the fuser assembly from the printer and
measure the voltage on connector J10-6 on the engine
board. See
“Fuser connectors” on page 5-25
. The
voltage should measure approxi3.3 V dc.
Is the voltage correct?
Go to step 2
Replace the engine
board. See
“Engine board
removal” on
page 4-29
.
2
Measure the voltage on the fuser DC control connector
on the LVPS. Measure the voltage on pin 6 of the
connector. The voltage should measure approximately
+3.3 V dc.
Is the voltage correct?
Replace the fuser
assembly. See
“Fuser assembly
removal” on
page 4-31
.
Replace the LVPS
assembly.
“Low
voltage power
supply (LVPS)
removal” on
page 4-38
.
Summary of Contents for 13P0195 - C 750dn Color Laser Printer
Page 14: ...xiv Service Manual 5060 00x ...
Page 15: ...Laser notice xv 5060 00x ...
Page 16: ...xvi Service Manual 5060 00x ...
Page 34: ...1 14 Service Manual 5060 00x ...
Page 115: ...Diagnostic information 2 81 5060 00x Printer configuration diagrams for 24x paper jams ...
Page 237: ...Repair information 4 19 5060 00x 9 Remove the MPF swing arm assembly E E ...
Page 312: ...4 94 Service Manual 5060 00x ...
Page 313: ...Connector locations 5 1 5060 00x 5 Connector locations Locations Printer boards ...
Page 315: ...Connector locations 5 3 5060 00x Printer sensors ...
Page 316: ...5 4 Service Manual 5060 00x Cartridge contact assembly pin locations ...
Page 317: ...Connector locations 5 5 5060 00x Engine board cabling ...
Page 318: ...5 6 Service Manual 5060 00x RIP board cabling ...
Page 344: ...5 32 Service Manual 5060 00x HCOF system board ...
Page 350: ...7 2 Service Manual 5060 00x Assembly 1 Covers ...
Page 352: ...7 4 Service Manual 5060 00x Assembly 1 1 Covers ...
Page 354: ...7 6 Service Manual 5060 00x Assembly 2 Cartridge mounting ...
Page 356: ...7 8 Service Manual 5060 00x Assembly 3 Fuser 3 2 1 ...
Page 358: ...7 10 Service Manual 5060 00x Assembly 3 1 Fuser web oiler 1 2 3 ...
Page 368: ...7 20 Service Manual 5060 00x Assembly 12 Multipurpose feeder MPF ...
Page 370: ...7 22 Service Manual 5060 00x Assembly 13 500 sheet integrated tray ...
Page 374: ...7 26 Service Manual 5060 00x Assembly 16 ITU drive assembly 2 4 1 5 3 5 ...
Page 376: ...7 28 Service Manual 5060 00x Assembly 17 ITU loading ...
Page 380: ...7 32 Service Manual 5060 00x Assembly 20 Cartridge drive assembly ...
Page 382: ...7 34 Service Manual 5060 00x Assembly 21 Electronics ...
Page 384: ...7 36 Service Manual 5060 00x Assembly 21 1 Electronics ...
Page 388: ...7 40 Service Manual 5060 00x Assembly 21 4 Electronics ...
Page 390: ...7 42 Service Manual 5060 00x Assembly 22 Electronic cabling engine board ...
Page 392: ...7 44 Service Manual 5060 00x Assembly 23 Electronic cabling RIP board ...
Page 396: ...7 48 Service Manual 5060 00x Assembly 26 Output expander ...
Page 398: ...7 50 Service Manual 5060 00x Assembly 26 1 Output expander ...
Page 400: ...7 52 Service Manual 5060 00x Assembly 27 5 bin mailbox ...
Page 402: ...7 54 Service Manual 5060 00x Assembly 27 1 5 bin mailbox ...
Page 404: ...7 56 Service Manual 5060 00x Assembly 28 500 sheet drawer option ...
Page 406: ...7 58 Service Manual 5060 00x Assembly 28 1 500 sheet tray option ...
Page 408: ...7 60 Service Manual 5060 00x Assembly 29 Duplex option ...
Page 410: ...7 62 Service Manual 5060 00x Assembly 29 1 Duplex option ...
Page 412: ...7 64 Service Manual 5060 00x Assembly 30 High capacity input tray HCIT ...
Page 414: ...7 66 Service Manual 5060 00x Assembly 30 1 High capacity input tray HCIT ...
Page 416: ...7 68 Service Manual 5060 00x Assembly 31 High capacity output finisher HCOF ...
Page 418: ...7 70 Service Manual 5060 00x Assembly 31 1 High capacity output finisher ...
Page 420: ...7 72 Service Manual 5060 00x Assembly 31 2 High capacity output finisher ...
Page 422: ...Service Manual 5060 0xx Assembly 32 High capacity output finisher cables ...
Page 426: ...7 78 Service Manual 5060 00x ...
Page 456: ...A 30 Service Manual 5060 00x ...
Page 458: ...B 2 Service Manual 5060 00x Print Menus Page two of two ...
Page 460: ...B 4 Service Manual 5060 00x Print Quality Pages Page 1 total of five ...
Page 461: ...Appendix B Print quality samples B 5 5060 00x Print Quality Pages Page 2 total of five ...
Page 462: ...B 6 Service Manual 5060 00x Print Quality Pages Page 3 total of five ...
Page 463: ...Appendix B Print quality samples B 7 5060 00x Print Quality Pages Page 4 total of five ...
Page 464: ...B 8 Service Manual 5060 00x Registration Quick Test ...
Page 466: ...B 10 Service Manual 5060 00x Printhead alignment test page yellow two of three ...
Page 468: ...B 12 Service Manual 5060 00x Print Line Len page ...
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