January 2010
2-12
Phaser 7760 Color Laser Printer
001-545.02
Revised
Status Indicator RAP’s
001-545.02 Tray 3 Paper Size Sensor
Incorrect paper size is detected in Tray 3.
Initial Actions
• Check that the paper size setting is correct.
• Check the Tray 3 Paper Size Sensor (PL 16.1) for damage or incorrect mounting. Repair
or replace as required.
• Check the switch actuators on Tray 3 (PL 16.1) for wear or damage. Repair or replace as
required.
Procedure
Ensure Tray 3 is closed. The voltage measured at P/J546-8 (Section 7 - TT Module (rear);
Plug/Jack Locations - Figure 25; 3T Module (rear) Plug/Jack Locations - Figure 26) on
the Tray Module PWB (PL 16.15) corresponds to the paper size in Table 1.
YN
There is +5 VDC from P/J816-1 to P/J816-3 on the Tray 3 Size Sensor (Section 7 - 3T
Module (Tray 3, 4, 5 Paper Size Switch) Plug/Jack Locations - Figure 23).
YN
There is +5 VDC from P/J546-9 to P/J546-7 on the Tray Module PWB.
YN
Go to the +5 VDC Wirenets (Section 7, 5.5 VDC Wirenets - Figure 4) to trouble-
shoot the power circuit.
Check the wires from P/J546 to P/J816 (Figure 1).
Check the wire from P/J546-8 to P/J816-2 (Figure 1). If the wire is OK, replace the Tray 3
Paper Size Sensor (PL 16.1).
Replace the Tray Module PWB (PL 16.15). If the problem continues, replace the Tray 3 Paper
Size Sensor (PL 16.1).
Figure 1 001-545.02 Tray 3 Size Sensor
Table 1 Tray 3 Size Sensor Values
Paper Size S1 S2 S3 S4 Voltage
No Tray OFF OFF OFF OFF 4.78
A3 SEF OFF OFF OFF ON 4.45
11x17 SEF OFF OFF ON OFF 4.12
8.5x13 SEF OFF OFF ON ON 3.81
-------------------- OFF ON OFF OFF 3.38
B5 or 16K LEF OFF ON OFF ON 3.18
B5 or 8x10 SEF OFF ON ON OFF 2.87
8.5x11 SEF OFF ON ON ON 2.57
-------------------- ON OFF OFF OFF 2.15
B4 or 8K SEF ON OFF OFF ON 1.98
A4 SEF ON OFF ON OFF 1.67
8.5x14 SEF ON OFF ON ON 1.37
-------------------- ON ON OFF OFF 0.91
A4 LEF ON ON OFF ON 0.77
8.5x11 LEF ON ON ON OFF 0.47
A5 or 5.5x8.5 SEF ON ON ON ON 0.17
Table 1 Tray 3 Size Sensor Values
Paper Size S1 S2 S3 S4 Voltage
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