One handset is faulty

If you do not have an answering system (answering machine) on the phone, you need to purchase a answering machine or contact your telephone service provider to get Voice Mail service from them. (Most charge $3-5 per month for voice mail.) The provider will tell you what number to call to set up a voice mail message and access messages.

I hope this helps.

Cindy Wells
(for most Uniden systems with the answering system, you need to turn it on and then access the system from the handset to set the out-going message and length of incoming messages allowed.)

First de-register by pushing # and end simuntaneously. Select de-register. Then place on the base until it says that it has registered. Uniden Registering

Sounds like you need to re-register the 2 handsets that are not working properly. Sometimes the handsets must first be de-registered then re-registered to the base unit. Send a comment with the model number of the base unit and handsets if they are not original handsets and I will give specific information for your phone. I have included a link where you can download the manual for your Uniden cordless phone by model number.

http://www.uniden.com/index/manuals_results.cfm?cat=1

Weak or Hard to Hear Audio (From the Uniden Manual)
If the caller’s voice sounds weak or soft, the signal might be blocked by large metal objects or walls; you might also
be too far from the base, or the handset’s battery may be weak.

1. Try adjusting the volume of the earpiece (see page 36) or the audio tone
2. Try moving around while you’re on a call or moving closer to the base to see if the sound gets louder.
3. Make sure the handset’s battery is fully charged.

On the base, open the menu and select Register Handset. The display should say Handset Registering.
On the handset you want to register, press and hold # until the handset display says Handset Registering (about 2 seconds).
1.
2.
DSL filterTelephone cordTelephone wall jack
45
In about 30 seconds, the handset display should say Registration Complete. Press Talk/fl ash and make sure you get a dial tone.
If...
Try...
you don't hear a dial tone
the display says Registration Failed --
Making sure the handset is fully charged, then start over at step 1.

Any kind of intermittent transmission problem, or solid transmission problems you mention are directly related to your phone. I'm not sure what kind of phone you have. If this is a typical home phone, it would either be the handset or the handset cord. If this is wireless, its the entire handset.

Hello,

I have the TRU9585 with 4 hansets. We used them for about 3 months, worked great. One day, I can hear caller, caller can't hear me. Problem was a defective transistor in base unit. Part number C2120, small 3 legged device near bottom of unit. Replaced it with generic NPN transistor from Radio Shack. Caution...should only attempt repair if you have worked on electronics before and can solder...Also C2120 configuration is not standard, configured emitter-collector-base instead of emitter-base-collector...Good luck!!!

don't hear with uniden 640 dcx

Have you tried putting in freshly charged batteries and registering the handsets to the base station?

Do you have another phone (cell phone) you can use to make a test call to yourself? If you can answer a call and the Uniden transmits voice OK, then it is probably the speaker and may just be a bad solder connection. If the handset does not transmit or receive I seriously doubt you have a bad microphone AND a bad speaker, you'd be looking at something more serious.