Xerox Phaser 7760 Service Manual page 49

001-545.03 Tray 4 (HCF) Paper Size Sensor
Incorrect paper size is detected in Tray 4.
Initial Actions
• Check that the paper size setting is correct.
• Check the Tray 4 Paper Size Sensor
or replace as required.
• Check the switch actuators on Tray 4
required.
Procedure
Ensure Tray 4 is closed. The voltage measured at P/J548 (Section 7 - TT Module (rear)
Plug/Jack Locations - Figure 25 or 3T Module (rear) Plug/Jack Locations -
the Tray Module PWB (PL 16.15) corresponds to the paper size in
Y N
There is +5 VDC from P/J820-1 to P/J820-3 on the Tray 4 Size Sensor 3T (Section 7,
TT Module (Tray 3, 4, 5 Paper Size Switch) Plug/Jack Locations -
Y N
There is +5 VDC from P/J548-12 to P/J548-11.
Y N
Go to the +5 VDC Wirenets
Go to Figure 1. Check the wires from J548 to J820. If the check is OK, replace the
Tray Module PWB (PL 16.15).
Go to Figure 1. Check the wire from J548-11 to J820-2. If the wire is OK, replace the Tray
4 Paper Size Sensor (PL 16.1).
Go to Figure 1. Check the wires and connectors for intermittent shorts or loose connections. If
the check is OK, replace the Tray Module PWB
the Tray 4 Paper Size Sensor (PL 16.1).
Table 1 Tray 4 Size Sensor Values
Paper Size S1 S2
No Tray OFF OFF
B5 LEF OFF OFF
A4 LEF ON OFF
8.5x11 SEF OFF OFF
Revised
Phaser 7760 Color Laser Printer
(PL 16.1) for damage or incorrect mounting. Repair
(PL 16.1) for wear or damage. Repair or replace as
Figure 26
Table 1.
Figure 23.
(Figure 4) to troubleshoot the power circuit.
(PL 16.15). If the problem continues, replace
S3 S4 Voltage
OFF OFF 4.78
ON OFF 3.19
OFF OFF 0.46
ON OFF 0.46
on
Figure 1 001-545.03 Tray 4 (HCF) Size Sensor
January 2010
2-13
Status Indicator RAP's
001-545.03