Xerox Phaser 7760 Service Manual page 114

007-273 Tray 5 Paper Size Sensor Broken (3TM)
An abnormal A/D value was detected by the Tray5 Paper Size Sensor.
Initial Actions
• Check that the paper size setting is correct.
• Check the Tray 5 Paper Size Sensor
or replace as required.
• Check the switch actuators on Tray 5 for wear or damage. Repair or replace as required.
Procedure
Ensure Tray 5 is properly closed. Measure the voltage at P/J548-5 (refer to Section 7, 3T Mod-
ule (rear) Plug/Jack Locations - Figure 26) on the Tray Module PWB
measured corresponds with the paper size in Table 1.
Y N
There is +5 VDC between P/J824-1 and 3 on the Paper Size Sensor
Y N
There is +5 VDC between P/J548-6 and 4 on the Tray Module PWB.
Y N
Go to the +5 VDC Wirenets (Section 7, +5 VDC Wirenet -
shoot the power circuit.
Check the wires from P/J548 to P/J824
required.
Check the wire from P/J548-5 to P/J824-2 for damage. Repair or replace as required. If
the wire check out OK, replace the Tray 5 Paper Size Sensor
• Ensure that the connectors shown in the circuit diagram
nected and that the wires are not damaged.
• Replace the Tray 5 Paper Size Sensor
• If the problem persists, replace the Tray Module PWB
Status Indicator RAP's
007-273
(PL 16.1) for damage, or incorrect mounting. Repair
(PL 15.9). The
(PL 16.1).
Figure 4) to trouble-
(Figure 1) for damage. Repair or replace as
(PL 16.1).
(Figure 1) are securely con-
(PL 16.1).
(PL 15.9).
voltage
Figure 1 007-273 Tray 5 Paper Size Sensor (3TM)
Table 1 Tray 5 Paper Size Sensor Values
Paper Size
No Tray
A3SEF
11x17SEF
8.5x13SEF
B5 or 16K LEF
B5 or 8 x 10 SEF
8.5x11SEF
B4 or 8K SEF
A4SEF
8.5x14SEF
A4LEF
8.5x11LEF
A5 or 5.5x8.5SEF
January 2010
2-78
S1 S2 S3
OFF OFF OFF
OFF OFF OFF
OFF OFF ON
OFF OFF ON
OFF ON OFF
OFF ON ON
OFF ON ON
ON OFF OFF
ON OFF ON
ON OFF ON
ON ON OFF
ON ON ON
ON ON ON
Phaser 7760 Color Laser Printer
S4 Voltage
OFF 4.78
ON 4.45
OFF 4.12
ON 3.81
ON 3.18
OFF 2.87
ON 2.57
ON 1.98
OFF 1.67
ON 1.37
ON 0.77
OFF 0.47
ON 0.17
Revised