Canon EOS 70DN Basic Instruction Manual page 590

Troubleshooting Guide
Wi-Fi
Wi-Fi cannot be set.*
If the camera is connected to a printer, computer, GPS receiver, or
other device with an interface cable, Wi-Fi cannot be set ([53: Wi-Fi]
will be grayed out). Disconnect the interface cable, then set the Wi-Fi.
For details, refer to the Wi-Fi Function Instruction Manual.
* The EOS 70D (N) does not have the Wi-Fi function.
Operation Problems
I cannot change the setting with the <6> dial, <5> dial,
or <9>.
Set the <R> switch downward (lock release, p.48).
Check the [8C.Fn III-2: Multi function lock] setting (p.375).
The camera button/dial's function has changed.
Check the [8C.Fn III-4: Custom Controls] setting (p.383).
During touch screen operations, the beeper suddenly
sounds softer.
Check if your finger is blocking the speaker (p.20).
Touch screen operation is not possible.
Check if [53: Touch control] is set to [Standard] or [Sensitive]
(p.56).
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