The Other YN-622C User Guide v.4.09
11/12/2014
Part II – 622C Transceivers Page 58 of 64
Fails to power on or automatically shuts down
• The batteries are installed incorrectly or are exhausted. The device will power down
automatically before the battery is fully depleted to avoid being over-discharged.
• Install fully charged batteries according to the battery compartment indicators.
• Battery low – on startup or half-shutter; Status will rapidly wink Red/Green, and the CH and
GP indicators will dimly wink also. If the voltage becomes low (total 2.2 volts), the 622C will
turn off automatically. Batteries can be too low on startup to trigger this action.
Firing groups cannot be disabled
• With Canon cameras, you can only disable group C by selecting Firing Group = A:B.
• Groups A and B are always fired no matter whether you select "ALL", "A:B", "A:B:C" or
disable the Wireless function.
Flash does not fire
• Ensure the batteries of all devices are fully charged, and flash has fully recycled.
• Check the connection between the 622C and camera, and 622C and flash.
• Ensure that the indicators show matching channels and Receiver groups.
• Check that flash is not disabled by its overheating protection, is not in continuous zoom
adjustment, or in sleep status.
• Use the Pilot button to test the flash.
Flash emits an unwanted pre-flash
• If the flash’s mode is E-TTL, it will emit a preflash. If the flash’s mode is Manual or Multi, it
won't.
Flash zoom cannot be set via camera menu
• When the Mixed Control mode has been set in the transmitter, or zoom locking has been
set in the receiver, zoom can't be set via camera menu.
• The Zoom setting of the on-TX flash needs to be set separately.
Full-power flash
• This can happen if the shutter release is fully pressed before the system has aligned every
component. The Fire! command can over-ride any setting up in progress.
• On startup or on any major adjustment to remote flashes, press half-shutter and release to
force system updating.
Gap between E-TTL Pre-flash and Main Flash
• This can be due to using only Group A flashes, but with all three firing groups (A:B C) set.
The camera takes time to issue instructions to non-existent Group B and Group C flashes.
Half Shutter
The shutter half-press is critical for the 622C to awaken remotes and their flashes, and update
remotes with current settings. When the camera shutter says Fire! this command over-rides
everything else, and misfires are likely.
Intermittent Access to Camera Menus on 6D
On-TX flash doesn't fire
• Enable the Master Flash firing in the wireless menu setting.
Unable to set channel 5, 6, 7 via camera menu
• The camera can only set channels 1 to 4. Set other channels using [CH SET].
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