I am trying to use my Dictaphone 3750 with a hearing aid compatible neckloop but when I plug it in using the right adapter it doesn't work at all.

Hello this is a great solution
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Hello http://www.tvps.com/Products/Dictaphone-C-Phone-Manual__ECS-MANDICPHONE.aspx

Does anything show up on the display? Like 'No Cassette' or 'End Tape'?

Are you using a foot control? Does the tape move when pressing the buttons on the machine itself? Is the foot control plugged into the side of the machine (and NOT the back)?

If you press and hold the 'Conf' button, the machine will record using it's built-in mic (located on the right-hand side of the machine, closer to the front). It is probably recommended to get a microphone that plugs into the machine for better recording quality. Depending on what you're recording, you could get a handheld microphone or a telephone record adapter that plugs into your phone and the back of the 3750 (press and hold 'Tel Rec' to use that).

The 3750 won't let you control the telephone record jack. The only way you can get a mic to work using the Tel Rec jack is by pressing and holding the 'Tel Rec' button for about 1 second. But this isn't compatible with the hands-free operation.

If you're looking to do hands-free recording, it uses the built-in conference mic. Press and hold the 'Conf Rec' button for about a second and it should start recording. This built-in mic is located on the right-hand side of the machine near the front by the headset jack.

If you want to control the machine via a foot control while in Conference Record mode, you'll have to change the 'Foot Control Dictate' setting in the menu. Here's how:

1) Press and hold the 'Erase' & 'Search' buttons for about 5 seconds until the menu appears.

2) Scroll through the options until you get to 'Foot Control Dictate' and set this to 'Yes'.

3) Press 'Stop' to exit the menu.

4) Press the 'Conf Rec' button to enter record mode.

Now you should be able to control the start/stop of the record function via the foot control.

Hope this helps...

You need to have a telephone record adapter plugged into the back of the 3750. Then you press and hold the Tel Rec button until it begins recording.

Also check to see if the 'Vox' or 'VA' switch is on (voice activation). This will cause the machine to pause if the volume is too low.

If it does this with all tapes, there is a small "no-cassette" switch at the back of the cassette compartment. The switch may be broken, dirty or out of adjustment. When you open the cassette door you should be able to see the switch tab. Push it in just a bit to see if the No Tape indicator goes out.

On the right-hand side of the unit, there are two buttons with on/off positions. Both the Speaker and VOX options should be in the off position. When VOX is turned on, it only records when it monitors a level of noise. I do not have it turned on ever.