bh1s.bk : bh1sdiag.doc 30 Thu Apr 20 12:42:16 1995
30
Service Manual
board. If the voltage is correct, check the continuity of the fan/mirror
motor cable. Replace the printhead if the cable is good.
Paper Size Sensing Problem
(The printed area does not fit on the page, or the paper size cannot be
changed from the operator panel.)
Make sure the paper tray and its stops are undamaged. Make sure the
cable to the paper size switch is connected correctly. With the paper
tray removed, the resistance of the paper size switch should be infinite.
With the tray installed, the resistance of the switch varies with the paper
size.
For Tray 1, remove the front cover, disconnect the cable from the sen-
sor and measure the resistance between the two pins on the sensor
board.
For 500-sheet option, remove the RIP Board, disconnect J15 from the
engine board, and measure between J15-3 and J15-4 on the cable.
If the readings do not match the following within 5% replace the paper
size sensor.
Regularly Spaced Marks
This is caused by a defect on one of the rolls or gears in the print pro-
cess. The damaged part can be determined by the spacing of the
marks according to the following table. Find and replace the damaged
part.
Tray installed and set to:
A5
1.4K Ohms (tray 1 only)
B5
2.0K Ohms
10.5”
3.0K Ohms
11”
4.7K Ohms
A4
8.0K Ohms
13” or 14”
17.8K Ohms (legal tray)
Summary of Contents for 3112
Page 1: ...S544 5256 00 3112 and 3116 Page Printer Service Manual ...
Page 10: ...x Service Manual ...
Page 16: ...xvi Service Manual ...
Page 50: ...34 Service Manual ...
Page 70: ...54 Service Manual ...
Page 79: ...Repair Information 63 ...
Page 89: ...Repair Information 73 ...
Page 91: ...Repair Information 75 ...
Page 93: ...Repair Information 77 ...
Page 95: ...Repair Information 79 ...
Page 101: ...Repair Information 85 ...
Page 106: ...90 Service Manual ...
Page 112: ...96 Service Manual ...
Page 116: ...100 Service Manual ...
Page 118: ...102 Service Manual ...
Page 120: ...104 Service Manual Gear Train ...
Page 121: ...Connector Locations 105 HVPS Transfer Roller Housing ...
Page 122: ...106 Service Manual Engine Board Connectors ...
Page 125: ...Connector Locations 109 Board Installation Hardware ...
Page 126: ...110 Service Manual Printhead Connector Locations ...
Page 130: ...114 Service Manual Printer Ground Straps ...
Page 136: ...120 Service Manual ...
Page 138: ...122 Service Manual Assembly 1 Covers ...
Page 140: ...124 Service Manual Assembly 2 Lower Frame ...
Page 142: ...126 Service Manual Assembly 3 Upper Frame ...
Page 144: ...128 Service Manual Assembly 4 Printhead ...
Page 146: ...130 Service Manual Assembly 5 Paper Feed ...
Page 148: ...132 Service Manual Assembly 5 Paper Feed Continued ...
Page 150: ...134 Service Manual Assembly 6 Paper Feed Alignment Gears ...
Page 152: ...136 Service Manual Assembly 7 Paper Feed Drive ...
Page 154: ...138 Service Manual Assembly 8 Standard Paper Tray 200 sheet ...
Page 156: ...140 Service Manual Assembly 9 Paper Tray 500 Sheet ...
Page 158: ...142 Service Manual Assembly 10 Base for Paper Drawer 500 Sheet ...
Page 160: ...144 Service Manual Assembly 11 Optional Paper Drawer 500 Sheet ...
Page 162: ...146 Service Manual Assembly 12 Fuser ...
Page 164: ...148 Service Manual Assembly 12 Fuser Continued ...
Page 166: ...150 Service Manual Assembly 13 Electronics ...
Page 168: ...152 Service Manual Assembly 13 Electronics Continued ...
Page 170: ...154 Service Manual Assembly 14 Transfer Roll ...
Page 172: ...156 Service Manual Assembly 15 Duplex Option ...
Page 174: ...158 Service Manual Assembly 16 Envelope and 100 Sheet Auxiliary Feeder ...
Page 178: ...162 Service Manual ...