4-30 Phaser 7500 Printer Service Manual
General Troubleshooting
Trays 3 through 5
For optional Trays 3 through 5, media size is detected by the state of five paper
size switches located at the rear of the chassis. 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 J548-14,
J549-B11, and J549-B17 respectively. 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 Trays 3 through 5
Paper Size SW1 SW2 SW3 SW4 SW5 Voltage
AD
Value
No Tray Off Off Off Off Off 4.66±0.03 237-247
A5 SEF 5.5" x 8.5"
SEF (*1)
Off Off On Off Off 4.01±0.03 199-214
B5 SEF Off Off On On On 3.69±0.03 184-198
8.5" x 13" SEF Off On Off On Off 3.07±0.03 153-167
8.5" x 14" SEF Off On Off On On
A4 SEF Off On On Off Off 2.75±0.03 137-152
8.5" x 11" SEF Off On On Off On
8" x 10" SEF Off On On On On 2.44±0.03 122-136
12.6” x 19.2" SEF/
13" x 19" SEF (*1)
On Off Off Off On 2.15±0.03 107-121
SRA3 SEF/ 13” x 18"
SEF/ 2" x 18" SEF (*1)
On Off Off On On 1.83±0.03 92-106
A4 LEF On Off On Off Off 1.52±0.03 77-91
A3 SEF On Off On On Off 1.21±0.03 61-76
B5 LEF 7.25" x 10.5"
LEF(*1)
On On Off Off On 0.91±0.03 46-60
8K SEF (*2) On On Off On Off 0.60±0.03 31-45
B4 SEF On On Off On On
8.5" x 11" LEF On On On Off Off 0.30±0.03 16-30
16K LEF (*2)/ 7.25" x
10.5" LEF (*1)
On On On Off On
11" x 17" SEF On On On On On 0.00±0.03 0-15
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