Phaser 7500 Printer Service Manual 4-29
General Troubleshooting
Tray 2
For Tray 2, media size is detected by the state of five paper size switches. Media
size is sensed by the voltage corresponding to the combined resistance of SW1
through SW4 and the state of SW5 (On/Off). A failed or jammed switch effects the
printer’s ability to accurately detect media size or presence in the tray.
Included in the table are the expected values for voltage readings at J417-B4. Also
listed are the range of A/D converter values. Any combination other than the ones
listed result in an undetermined size.
*1 Paper size is changed in diag.
*2 System setting makes possible changing between GCO and TFX sizes
Paper Size Switch Output Values Tray 2
Paper Size SW1 SW2 SW3 SW4 SW5
Voltage at
J417-B4
AD
Value
No Tray Off Off Off Off Off 3.08±0.066 922-989
A5 SEF 5.5" x 8.5"
SEF (*1)
Off Off On Off Off 2.671±0.066 797-857
B5 SEF Off Off On On On 2.468±0.066 735-796
8.5" x 13" SEF Off On Off On Off 2.064±0.066 610-671
8.5" x 14" SEF Off On Off On On
A4 SEF Off On On Off Off 1.864±0.066 548-609
8.5" x 11" SEF Off On On Off On
A4 LEF On Off On Off Off 1.079±0.066 304-365
A3 SEF On Off On On Off 0.881± 0.066 244-303
B5 LEF 7.25" x
10.5" LEF (*1)
On On Off Off On 0.691± 0.066 184-243
8K SEF (*2) On On Off On Off 0.493±0.066 124-183
B4 SEF On On Off On On
8.5" x 11" LEF On On On Off Off 0.300±0.066 64-123
16K LEF (*2)/ 7.25"
x 10.5" LEF (*1)
On On On Off On
11" x 17" SEF On On On On On 0.106±0.066 0-63
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