[Error Code] Xerox phaser 7400 u19 code

[Bluezman]

Hi All I have this Xerox 7400 that has a U18 yellow LCD I have replace the led unit however the code keeps coming back

Thanks
BM

[landspeeder]

[C][M][Y][K] LED Failure

Applicable Status Codes:

Code U18:

Yellow LED Failure

Code U19:

Magenta LED Failure

Code U20:

Cyan LED Failure

Code U21:

Black LED Failure

Initial Actions:

■

Cycle the printer's power.

■

If the problem persists follow the procedure below.

Troubleshooting Reference Table

Applicable Parts Wiring and Plug/Jack References

■

LED Head, PL1.1.2

■

LEDPWR harness, PL12.1.20

■

LED Relay Board, PL12.1.34

■

YK LEDDATA harness, PL12.1.21

■

CM LEDDATA harness, PL12.1.22

■

Print Engine Map 1 (page 10-4)

■

Print Engine Map 3 (page 10-6)

■

Print Engine Map 13 (page 10-16)

■

Print Engine LED Heads (page 10-37)

Troubleshooting Procedure Table

Step Actions and Questions Yes No

1

Check LED Head.
Exchange the affected LED Head with
another LED Head.
Does the error move with the LED Head?
Replace the LED
Head.
Go to Step 2.

2

Ensure the LED Head harness is properly
connected and not damaged.
Is the wiring harness defective?
Reconnect or
replace wiring
harness.
Go to Step 3.

3

Check harness continuity between the LED
Head and the Engine Control Board.
Is there continuity?
Go to Step 4. Replace the data
harness.

4

Check harness continuity between the LED
Head and the LED Relay Board.
Is there continuity?
Go to Step 5. Replace the power
harness.

5

Check for +5 V to the LED Relay Board.
Disconnect the POWER connector.
Is there +5 V between POWER-1 <=>
ground?
Replace the LED
Relay Board
(page 8-126).
Go to Step 6.

6

Check for +5 V at the LVPS.
Disconnect CN1 from the LVPS.
Is there +5 V between CN1-1 and CN1-2?
Replace the Engine
Control Board
(page 8-112).
Replace the LVPS

(page 8-121).