Film Winding; Film Rewinding - Canon EOS 55 Service Manual

Part 2: Technical Information
2.12 Film Winding
1. The motor turns in reverse starting film winding.
2. The photoreflector PRFILM lights.
3. The MPU's PRAD port switches to level comparator mode.
4. When eight perforations are counted, the motor stops.
5. The ftlm counter advances one count.
6. The motor phase switch stops at the flash position.
2.13 Film Rewinding
1. The battery is checked.
2. The motor turns forward to switch to the rewind phase.
3. The motor turns in reverse starting film rewinding.
4. The photoreflector PRFILM lights.
5. The MPU's PRAD port switches to level comparator mode.
6. When eight perforations are counted, the frame counter decreases one count.
7. When the frame counter reaches zero, the film leader timer operates.
8. The motor stops.
9. The motor phase switch stops at the flash position.
Rsw:
47K :_
~
~
CMSP1 58
CMSP2 94
CMSP3 95
MPU
LL
a:
i i
45 PRON
44 PRAD
P.GND
MD2
RSFD...,._-----,
~--"IFWD PGND,...,..,_-----+~
,---'-IREV FSRDI-'-'----,
CM 0.1
MD1
RSFD·l-" 13
=---------,1--1-----'
~ 1 - - - - - - - - - - - - + - l - - - " I F W D
PGND,l-" 12
~ - t - - + - - ~
~ - - - - - - - - - - < > - - t - < . - - - ' - 1 7 REV FSRD>-'- 11 ~ ~
Fig.
2-33
Film Transport
2-41