January 2010
2-13
Phaser 7760 Color Laser Printer
001-545.03
Status Indicator RAP’s
Revised
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 (PL 16.1) for damage or incorrect mounting. Repair
or replace as required.
• Check the switch actuators on Tray 4 (PL 16.1) for wear or damage. Repair or replace as
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 - 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/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 - Figure 23.
YN
There is +5 VDC from P/J548-12 to P/J548-11.
YN
Go to the +5 VDC Wirenets (Figure 4) to troubleshoot the power circuit.
Go to Figure 1. Check the wires from J548 to J820. If the check is OK, replace the
Tr ay M o d u l e PW B ( 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 (PL 16.15). If the problem continues, replace
the Tray 4 Paper Size Sensor (PL 16.1).
Figure 1 001-545.03 Tray 4 (HCF) Size Sensor
Table 1 Tray 4 Size Sensor Values
Paper Size S1 S2 S3 S4 Voltage
No Tray OFF OFF OFF OFF 4.78
B5 LEF OFF OFF ON OFF 3.19
A4 LEF ON OFF OFF OFF 0.46
8.5x11 SEF OFF OFF ON OFF 0.46
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