Xerox Phaser 7760 Service Manual page 115

007-274 Tray 1 (MPT) Paper Size Sensor Broken
An abnormal A/D value was detected by the Tray 1 (MPT) Paper Size Sensor.
Initial Actions
Check the connectors between the Tray 1 (MPT) Paper Size Sensor and the I/F PWB.
Procedure
Check the voltage between P/J265-2 (Figure
Side Guide for Tray 1 (MPT). The voltage changes from 0 VDC to 3 VDC.
Y N
+3.3 VDC is measured at P/J265-1 on the Tray 1 Paper Size Sensor (refer to Section
7, Tray 1 - Plug/Jack Locations -
Y N
Check the wires and connectors. If the check is OK, replace the I/F PWB
Replace Tray 1 (MPT) Assembly (PL
Check the wires and connectors. If the check is OK, replace the I/F PWB
Figure 1 007-274 Tray 1 (MPT) Paper Size Sensor
Revised
Phaser 7760 Color Laser Printer
1) (yellow wire toward rear) and ground. Move the
Figure 8).
2.12).
(PL 9.1).
007-276 Tray 4 Paper Size Sensor Broken (TTM)
An abnormal A/D value was detected by the Tray 4 Paper Size Sensor.
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/J548-11 (refer to Section 7, TT Module
(rear), Plug/Jack Locations -
(PL 9.1)
to the paper size in Table
Y N
There is +5 VDC from P/J820-1 to P/J820-3 on the Tray 3 Size Sensor (refer to Sec-
tion 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/J548-10.
Y N
Go to the +5 VDC Wirenets (Section 7, +5 VDC Wirenet -
shoot the power circuit
Check the wires from J548 to J820
Module PWB
Check the wire from J548-11 to J820-2
Paper Size Sensor
Check the wires and connectors for intermittent shorts or loose connections
check is OK, replace the Tray Module PWB
Paper Size Sensor (PL 16.1).
Table 1 Tray 4 Size Sensor Values
Paper Size
No Tray
B5 LEF
8.5x11 LEF
A4 LEF
January 2010
2-79
(PL 16.1) for damage or incorrect mounting. Repair
(PL 16.1) for wear or damage. Repair or replace as
Figure 25) on the Tray Module PWB
1.
(Figure 1). If the check is OK, replace the Tray
(PL 16.15).
(Figure 1). If the wire is OK, replace the Tray 4
(PL 16.1).
(PL 16.15). If the problem continues, replace Tray 4
S1 S3 Voltage
OFF OFF 4.78
OFF ON 4.11
ON OFF 2.23
ON ON 1.59
(PL 16.15) corresponds
Figure 23).
Figure 4) to trouble-
(Figure 1). If the
Status Indicator RAP's
007-274, 007-276