Initial Document Size Detection; Detecting Jams - Canon D1 Service Manual

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Technology > Controls (DADF) > Document Detection > Detecting Jams

■ Initial Document Size Detection

The document length sensor 1 (SR8) and document length sensor 2 (SR8) detect the
longitudinal size of the document placed on the document tray, and the document
width sensor 1 (PS2) and the document width sensor 2 (PS1) detect the lateral size of the
document.
Document sizes are determined by the combination of the ON/OFF states of document length
sensors, the combination of ON/OFF states of document width sensor.
SR9
PS1
SR7
2 Technology > Controls (DADF) > Document Detection > Detecting Jams
SR8
PS2
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The following table shows the relationship among length detection sensor signals, document
widths, and initial document sizes.
type
Document width Document width
sensor 1(PS2) sensor 2(PS1)
AB.type A3 ON
B4 OFF
A4R OFF
B5R ON
A4R ON
A5R ON
B5R OFF
A5R OFF
B6 ON
Inch type LDR OFF
LGL OFF
LTRR OFF
LTR OFF
STMT OFF

■ Detecting Jams

1 Jams
This machine detects document jams using the sensors shown below. Document jam check
timings are stored in the ROM on the reader controller PCB to check
whether a jam has occurred according to presence/absence of a document at the relevant
sensor position.
When a jam occurs, the host machine stores its code.
Jam codes can be checked by outputting a jam error log report in the service mode of the
host machine.
Sensor name
Document length Document length
sensor 1(SR9) sensor 2(SR8)
ON ON ON
ON ON ON
OFF OFF ON
OFF OFF ON
ON OFF OFF
OFF OFF OFF
ON OFF OFF
OFF OFF OFF
OFF OFF OFF
ON ON ON
OFF ON ON
OFF OFF ON
ON OFF OFF
OFF OFF OFF
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T-2-9
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