Ricoh FT8880 Service Manual page 177

SECTIONAL DESCRIPTION
2.10 JAM DETECTION
2.10.1 Jam Detection Condition
The jam detection timing is determined by pulses from the timing sensor. The
diagram below illustrates the timing interval in which each sensor detects
paper jams in operation.
Paper Exit Signal from Copier
Entrance
Sensor
Registration
Sensor
Jam
Sensor
Exit
Sensor
Jam Detection Timing
By-pass Tray
Gate Motor
Tray Gate HP
Sensor
Tray Gate Upper
Position Sensor
Main Motor
*1. Jam detection timing depends on the bin position
Bin No. Pulses
proof
1
2
3
4
5
6
Staple failure is detected if the paper sensor is not de-energized after the
machine finishes returning the stapled paper to the bin.
340 pls
300 pls
400 pls
ON
Sorter Jam
Bin No.
470 7
436 8
422 9
408 10
394 11
382 12
368 13
280 pls
*1
436 pls
470 pls
OFF ON OFF
Stop Signal
from Copier
Pulses
354
342
328
314
302
288
274
19
6 March 1992
280 pls
280 pls
ON ON OFF OFF
Papers in
copier exit
Bin No. Pulses
14 260
15 248
16 234
17 220
18 208
19 194
20 180