Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 81

Tray Failure Troubleshooting Procedure (cont'd.)
Step Actions and Questions
6 On the Tray 1 Size PWB, measure continuity between
P/J331 pin 12 to P/J61 pin 1.
Is there continuity between the two pins?
7 Check the wiring between P/J67 pin 5 on the Tray 1
Feeder PWB and the bottom pin on the Paper Feeder
Socket (P/J672).
Is the wiring in good condition?
8 On the paper tray, measure the resistance between the
middle and bottom terminals on the Paper Feeder
Socket.
Is the resistance 90 ±15 ohms?
9 On the paper tray, measure the resistance between the
top and bottom terminals on the Paper Feeder Socket.
Is there continuity between the two pins?
10 Replace the following parts one at a time until the
problem is resolved:
Stack Height Sensor (RRP 3.4 on
I
Feeder PWB (RRP 3.9 on
I
Size 1 PWB (RRP 3.13 on
I
Engine Logic Board (RRP 9.3 on
I
11 Remove and reinstall the Tray indicated.
Does the C3 error code still appear?
12 1. Exchange Tray 1 with the Tray generating the "C3"
code.
2. Print a test print from each tray.
Does the error code now indicate a Tray 1
failure?
13 Does the error code indicate a Tray 2 failure?
14 1. Remove Tray 3 from the feeder.
2. Check the voltage between the lower terminal on the
Paper Feeder Connector and frame ground.
Is the voltage +24 VDC?
15 Check the wiring harness between the Tray 2 Size
PWB (P/J53) and the Tray 3 Size PWB (P/J54).
Is the harness in good condition?
2-44
page 6-31)
page 6-37)
page 6-42)
page 6-89)
Phaser 4400 Laser Printer Service Manual
Yes No
Go to step 7. Replace the
Tray 1 Size
PWB (RRP
3.13 on
page
Replace the Replace the
Tray 1 Socket and
Feeder PWB Harness (PL
(RRP 3.9 on 3.1 on
page 6-37). page
Go to step 9. Go to
Motor
Assembly
Checkout
page 3-26.
Go to step Replace the
10. Socket and
Harness (PL
3.1 on
page
Go to step Problem
12. solved.
Go to step Go to step
19. 13.
Go to step Go to step
16. 14.
Go to step Go to step
18. 15.
Replace the Replace the
Tray 3 Size
Size Harness
PWB (RRP
Assembly
11.19 on
(PL 11.1 on
page 6-139),
page
then the Tray
3 Feeder
PWB (RRP
11.9 on
page 6-128.
6-42).
7-10.
Tray
on
7-10.
7-27).