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3–85
OPERATIONS AND TIMING
COPYRIGHT
©
1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
H. Identifying the Size of the
Cassette
Specific photointerrupters (Q651, Q652, Q653,
Q654) turn OFF or ON when a cassette is slid into
a cassette holder.
Specific combinations of the states (ON/OFF) of
the photointerrupters are used by the microprocessor
on the DC controller PCB to identify the presence/
absence of a cassette and the size of the cassette
(if any) and to control scanner reversal and blank
exposure. (See Table 3-402.)
Cassette size
No cassette
B5R (182 × 257)
A4 (297 × 220)
A3 (297 × 420)
Mini (STMTR) 5.5" × 8.5"
(148 × 216)
Legal 8.5" × 14"
(356 × 216)
Letter 11" × 8.5"
(279 × 216)
A4R (210 × 297)
Letter R 8.5" × 11"
(216 × 279)
A5R (149 × 218)
A5 (218 × 149)
Mini-R (STMT) 8.5" × 5.5"
(216 × 148)
B5 (257 × 182)
B4 (364 × 257)
Ledger 11" × 17"
(182 × 257)
*U
(182 ~ 283 × 198 ~ 354)
Configuration
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
(left)
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
(right)
(unit: mm)
Table 3-402
1: Photointerrupter blocking the light.
0: Photointerrupter not blocking the light.
* Sizes may be stored in memory within dimensions given (in mm; see the Service Handbook for details).
Q654
Q653
Q652
Q651