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Check your device audio IC and apply some heat but not too much heat, to locate the IC send me your device model and maker name.Check your device audio IC and apply some heat but not too much heat, to locate the IC send me your device model and maker name.
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If you want to speak to the recipient before sending a fax, or if the recipient does not have a fax machine that can receive faxes automatically, send a fax manually after speaking to the recipient on the telephone to check whether the recipient can receive faxes.
Make sure that the machine is turned on.
Press the FAX button.The Fax standby screen is displayed.
Load the documents in the ADF
Adjust the scan contrast and resolution as necessary.
Lift the handset of the telephone connected to the machine.
Use the telephone to dial the recipient's fax/telephone number.
Speak to the recipient.
When you hear a high-pitched signal instead of the recipient's voice, you cannot check whether the recipient can receive faxes. If you want to stop sending the fax, replace the handset. If you want to send the fax, go to step 9.
Ask the recipient to set the recipient's fax machine to receive faxes.
When you hear a high-pitched signal, press the Color button or the Black button.
Press the Color button for color transmission, or the Black button for black & white transmission.
hold down the scroll wheel on the left side while in windows media player, hold it down till a volume bar comes up, make sure that its all the way up by rolling the wheel up
If you are sure you can't be heard while NOT on speakerphone, it's probably a software problem, if you can be heard but can't hear while NOT on speakerphone, then it might be a bad Mic. If you really can't be heard while NOT on speakerphone and you are out of other options, perform a HARD RESET to restore the phone to factory (or current ROM) settings. Check to make sure the mute function isn't being initiated when you take the phone off speakerphone or start a call.
The 6510H "H" phone is not a speakerphone. You can make internal intercom calls using a simulated speakerphone (H = Handsfree answer back) but you cannot talk to anyone on an outside call without using the handset.
You would need a 6510S
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