January 2010
2-76
Phaser 7760 Color Laser Printer
007-271
Revised
Status Indicator RAP’s
007-271 Tray 3 Paper Size Sensor Broken
An abnormal A/D value was detected by the Tray 3 Paper Size Sensor.
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/J546-9 (refer to Section 7, TT Module
(rear) - Figure 26 - 3T Module (rear) - Plug/Jack Locations - Figure 25) - on the Tray Mod-
ule 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 2 Size Sensor (refer to Sec-
tion 7, TT Module (Tray 2,3,4, Paper Size Switch) - Plug/Jack Locations - Figure 23).
YN
There is +5 VDC from P/J546-9 to P/J546-7 (refer to Section 7, TT Module (rear)
Plug/Jack Locations - Figure 25 or 3T Module (rear) - Plug/Jack Locations -
Figure 26) on the Tray Module PWB.
YN
Go to the +5 VDC Wirenets (Section 7, +5 VDC Wirenet - Figure 4) to trouble-
shoot the power circuit.
Check the wires from P/J546 to P/J816 (Figure 1).
Check the wire from P/J546-9 to P/J816-1 (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 - TTM or PL 15.9 - 3TM). If the problem continues,
replace the Tray 3 Paper Size Sensor (PL 16.1).
Figure 1 007-271 Tray 3 Paper 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
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
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
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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