deskset no tx

[johnny1225]

We have a C1000 Deskset at one of the local Hospitals hooked into a CDM700 Repeater. What we have done is moved the CDM700 UHF Repeater, Duplexer and Filtering Cans down one floor. Basically everything is working great except for one problem. C1000 Deskset receives great, Transmits fine through the Red button the the actual deskset, but will not transmitt through the desk mic, which was transmitting fine before we moved everything. Switch the mic with a known good one but still does the same thing. The mic is opening the line up, but can hear voice. Is there something i have to adjust inside the C1000 or programming that must be redone. I thought i would ask the experts for a quick reply.

Thanks in advance......

John

[Jim202]

[quote="johnny1225"]We have a C1000 Deskset at one of the local Hospitals hooked into a CDM700 Repeater. What we have done is moved the CDM700 UHF Repeater, Duplexer and Filtering Cans down one floor. Basically everything is working great except for one problem. C1000 Deskset receives great, Transmits fine through the Red button the the actual deskset, but will not transmitt through the desk mic, which was transmitting fine before we moved everything. Switch the mic with a known good one but still does the same thing. The mic is opening the line up, but can hear voice. Is there something i have to adjust inside the C1000 or programming that must be redone. I thought i would ask the experts for a quick reply.

Thanks in advance......

John[/quote]

I would take a stab at this one and ask if by some chance if the mic cable was disconnected for the move. If so, then I would look at the mic wires not being on the correct terminals. You should have a ground, mic high, PTT and maybe a monitor wire. By some chance did the monitor and PTT get reversed?

Jim

[Dan562]

Hello John,

I have no experience with either unit but the C1000 Desktop Remote sounds like a Local Remote meaning there's a multi-conductor 8 to 10 wire cable installed between the console and the repeater. Normally on /\/\ microphones, desk or mobile applications require a DC voltage to the microphone element (transducer) before any audio would be passed through the circuitry up to the CDM700 repeater's transmitter.

You or your shop should have a manual with the schematic showing a basic diagram how this Desktop console is suppose to be wired. As Jim stated, there could be a ground wire broken or missing. If you've gpt two Desk mics with identical problem, rule them out and look inside the C1000 Remote console for broken or missing wire connections. These two products sound like the Low Tier /\/\ Radius Line. I suppose there could be another place to look for broken wires, on the connection point at the CDM700 repeater itself.

Have the proper manuals, schematics, test equipment and tools with you to aid in the field troubleshooting process. Guessing won't help you, it only burns up time and time is equal to money.

Dan

[johnny1225]

The wierd part pf it is, i was down there yesterday and what was happening was, they are using a HMN3000 desk mic. The telephone handset that is actually sitting on the c1000 is just sitting there not even pugged into anything. When it is sitting in the proper way there is rx, when you take the telephone handset off and turn it around mean not sitting on the cradle the right way, there is tx but then there is no rx, this is the first time ive seen this.

any help or has anyone seen this before

john

[wavetar]

I've never seen a C1000 remote. Are you sure it isn't an older C100 series, or perhaps an MC1000? Could you maybe give the model# from the label underneath the unit? That would at least tell us what type of remote we're dealing with (local, tone, DC).

Todd

[johnny1225]

i'm sorry your right.......it is a MC1000 model # L3212 DC Remote Deskset, i hope this is enough info


john

[Dan562]

Hello John,

Do you have a /\/\ service manual for thid DC Remote?

It is so easy to create more problem by not providing the proper model number information on your first post. This is a DC Remote and you can not flip the Telco pair over because there's Polarity involved meaning Red is (+) Plus and Green is (-) Negative on a typical installation. What I think has happened is when you moved the CDM700 Repeater, Duplexers, and additional Filter, you did not pay close enough attention to the DC Remote Wirelines. When you reconnected the Wire Lines, you reversed the pair of wires.

Now to correct the problen is very simple to accomplished. Either at the Console or the CDM700 Base Station / Repeater, disconnect the Wire Line pair and FLIP them over reconnecting them to the unit terminals.

Remember this is a DC Remote so the connections always require to be of the proper polarity for Tx, Rx and RF channel switching functions.

On a Tone Remote Control TRC Console Wire Lines DON'T require polarity because the nature of the audio oscillator sinusoidal waveform frequency tones for Tx, Rx and RF channel switching functions.

If the Handset is laying in the normal craddle position disconnected and a HMN3000 Desk Microphone is plugged into console, any time the handset is lifted off of the remote's craddle position, the receive audio will automatically disconnect the internal speaker and route the audio to the handset. Since the handset isn't being used, the receive audio has no place to go, therefore it's not heard.

Dan

[johnny1225]

I was down there today and did exactly what you said, in your post Dan, so i hooked up the handset and took awaythe HMN3000 desk mic. The Handset is working perfectly TX and RX, I plug in the HMN3000 and the Desk Mic dosen't work. Is there programming of the correct Ma or something, does the Desk mic take more juice to run?????


joihn

[HumHead]

I have never played with the MC1000, only the MC2000 & MC2500. For both the MC2000 & 2500 there are settings in deskset configuration for both "handset present" and "external mic present".

If the same holds true for the MC1000, someone may have disabled "external mic present" in your unit.

[wavetar]

The wierd part pf it is, i was down there yesterday and what was happening was, they are using a HMN3000 desk mic. The telephone handset that is actually sitting on the c1000 is just sitting there not even pugged into anything. When it is sitting in the proper way there is rx, when you take the telephone handset off and turn it around mean not sitting on the cradle the right way, there is tx but then there is no rx, this is the first time ive seen this.

any help or has anyone seen this before

john

This is normal operation. There's a magnet in the handset which activates a magnetic reed switch inside the remote. This is how the remote determines the handset is in the cradle, thus it routes the RX audio to the external speaker. If you put the handset in backwards, the reed switch doesn't activate, and the RX audio is routed to the handset.

So, when you say 'there is TX', do you mean TX with the HMN3000, or TX with the 'TX' button on the remote? And does the TX go away when the handset is in it's 'proper' position?

Todd

[johnny1225]

There is TX with the handset, no tx with the red button on the front of the MC1000 and no tx with the HMN3000. If you reverse the handset on the deskset then there is tx through the HMN3000, but no RX, but the handset back to its proper spot and the rx is back but no tx from the HMN3000, but there is TX through the handset. I have tried new HMN3000 still didn't work. Is there a switch like the last post says that has internal, external mic acc. I just need to get the HMN3000 working and everything is all gooooood.......

john

[HumHead]

Not to be silly, but it sounds an awful lot like the plugs for the handset and the desk mic got swapped. Easy enough to do when moving the deskset around.

[johnny1225]

Thats the thing that is weird, we never touched the deskset during the move, the deskset is located in central dispatch and we never moved or touched one thing there, desk mic and everything working great until the move now the HMN3000 dosn't work nor the red transmit button, I think we covered ever solution, but are missing something somewhere.....
Does anybody have any other solutions that we can try...........



John

[wavetar]

Thats the thing that is weird, we never touched the deskset during the move, the deskset is located in central dispatch and we never moved or touched one thing there, desk mic and everything working great until the move now the HMN3000 dosn't work nor the red transmit button, I think we covered ever solution, but are missing something somewhere.....
Does anybody have any other solutions that we can try...........



John

When you say 'not working'...do you mean the red TX light in the remote doesn't light up, and the repeater doesn't key-up...or do you mean you hear the repeater key-up, but there's no audio. I'm just trying to clarify, since the info given above conflicts at times.

Todd

[johnny1225]

When we transmit with the HMN3000 desk mic, it opens the repeater line and you hear a hum noise on the recieving radio's, but there is no tx audio coming through. I replace with the handmic and there is tx audio. The handmic is on the cradle at all times.


john

[wavetar]

There is TX with the handset, no tx with the red button on the front of the MC1000 and no tx with the HMN3000. If you reverse the handset on the deskset then there is tx through the HMN3000, but no RX, but the handset back to its proper spot and the rx is back but no tx from the HMN3000, but there is TX through the handset. I have tried new HMN3000 still didn't work. Is there a switch like the last post says that has internal, external mic acc. I just need to get the HMN3000 working and everything is all gooooood.......

john

Ok, so you get TX audio from the HMN3000 when the handset is not in the cradle, correct? You say at this point there is no RX audio, but I believe if you put the handset to your ear, there is actually RX audio present in the earpiece...just not at the handsfree speaker.

I haven't seen an MC1000 with a built-in external mic jack, so I'm only thinking out loud here. It would seem you need to have the handset out of the cradle to allow the HMN3000 to TX properly. If it's like the 'regular' MC1000 unit's I've seen, then you need to press the 'speaker' button while the handset is out of the cradle in order to get RX audio at the handsfree speaker.

So, lift the handset out of the cradle. Press the 'speaker' button, the LED should turn on. You should now be able to TX with the HMN3000, and RX through the handsfree speaker.

It should continue to work in this fashion unless the speaker button is pushed again, or the handset is returned to the cradle.

Todd

[johnny1225]

Thanks guys for all you help, and thanks wavetar, i tried what you said on the last post and it work great, a 2 sec job turned into hours of checking everything. Thanks guys


john