Switch Nomenclature And Function - Canon EOS 55 Service Manual

Part 2: Technical Information
3. SWITCH NOMENCLATURE AND FUNCTION
No. Symbol Switch Name
Operation Buttons, Dials
1 SWl Ranging/Metering
2 SW2 Release
3 MAIN 1, 2, 3, 4 Mode Select
(Command Dial)
4 LMES 1, 2 SW Metering Mode
5 AFMODEI, 2 SW AF Mode Select
6 DRIVE SW Film Winding Mode
7 AELK SW AE Lock
8
AFSELSW
AF Point Select
9 MDIAL I, 2 SW
Main Electrical Dial
10 SUBONSW Q. Control Dial On
11
SDIALl, 2 SW
Quick Control Dial
12 SELF SW Self-timer, Remote
13 POPUPSW Flash up
14 RBTNSW
Manual Rewind
15 FUNCSW Function
16 PANORAMA SW Panorama
Internal Switches
17 BPSW Back Cover
18 CMSPI, 2, 3 SW Motor Phase
19 BATSW
Reset
20 MIFSW Mount Interface
21 SHBUSYSW
External Flash
22 POPENDSW Pop-up End
23 POPCTRSW Pop-up Control
24
xsw
Xsync
25 CN2SW 2nd Shutter Curtain
26 DXl-5 SW DX Code
27 PTIN SW Film Cartridge
Function
Distance and exposure metering start
Initiates exposure sequence
Select photographic mode,
Main Switch turns off at "L".
Select metering mode
Select AF mode
Sets film winding mode, single or continuous
Locks in present exposure value (AE Lock
remains while metering timer is working.)
Allows the focusing point to be selected with
the Main Dial.
Operated using in combinations with other
switches, e.g., shooting mode, AF mode,
metering mode
Tums on/ off the Quick Control Dial
For exposure and metering compensation
Allows self-timer or remote control shooting
Built-in flash pops up
Initiates manually induce powered rewind
Sets film speed, AEB, etc.
Sets to Panorama mode
Low when the back cover is open
Switches modes, shutter charge, mirror posi-
tion, film winding, and built-in flash lifting
Resets ICs when the battery is installed.
Lens sensor - On when a lens is attached.
Senses when an external flash is mounted.
On when the built-in flash is up
The motor stops after High-Low-High sequence
Flash trigger switch
Senses completion of 2nd curtain travel
Reads film speed portion of the DX code
Film cartridge sensor - Open when a cartridge
is installed.
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