Potentiometer question

[Hobbyscan]

Hello all,
Does anyone know what series (part number) of potentiometer "Pot" (Tocos brand) (vol/sel/sql) Uniden put in these handhelds. I'm currently having an issue where the unit is shorting out[ gets hot] and wondered if this was the issue. The leads on the pot/board are brown. Would like to purchase a replacement pot and see if this is the culprit. Do pots short out? The pot has five leads and is stamped with the number 22. Also near the leads is a paper label "R-b27" if that means anything. I also noticed on the PC board that "S101" is stamped on there in white if that helps too. Just need a little direction. Thank you in advance for any help you may have, Justin.

P.S.: This scanner is out of warranty.

 

[jim202]

Hello all,
Does anyone know what series (part number) of potentiometer "Pot" (Tocos brand) (vol/sel/sql) Uniden put in these handhelds. I'm currently having an issue where the unit is shorting out[ gets hot] and wondered if this was the issue. The leads on the pot/board are brown. Would like to purchase a replacement pot and see if this is the culprit. Do pots short out? The pot has five leads and is stamped with the number 22. Also near the leads is a paper label "R-b27" if that means anything. I also noticed on the PC board that "S101" is stamped on there in white if that helps too. Just need a little direction. Thank you in advance for any help you may have, Justin.

P.S.: This scanner is out of warranty.

It might be better to provide just a little more information.

1. Unless I missed it, there was no model to the device radio your talking about.

2. Just where on the radio is it getting "hot" as you call it?

3. Does this happen all the time or just now and then?

4. How long is the radio turned on before it gets "hot" as you describe it?

5. How long do the batteries last while your using the radio?

6. What kind of batteries are you using?

7. Is the received audio level normal or reduced?

8. Does the received audio have any background noise like pops, static, distorted audio or even a hum on strong signals?

These questions might not seem important, but they allow a more logical trouble shooting process. It may even take more questions to narrow down the source of your "hot" radio issue.

 

[wtp]

it was posted under

BCD396XT so my guess is that radio.
i think it is called a hall effect part.

 

[dkf435]

It is not a POT but a rotary encoder. If you had concentric knobs with limit stops like on a lot of the amateur radios there could be a potentiometer in there but it is just a rotary encoder with a push switch.

TOCOS America

http://forums.radioreference.com/un...8-bcd396t-control-knob-hack-3.html#post836615

David

 

[darunimal]

PartsRequest < UnidenMan4 < TWiki

 

[Hobbyscan]

jim202,

1. BCD396XT

2. Seems that the top gets hot, seems to be more the back side. Also batteries (Alkaline) are overheated when they discharge so fast.

3. This happens all the time. With fresh Alkaline batteries I maybe get five minutes until the battery indicator displays and shuts off. The switch in the back is switched for the type of batteries I'm using. With fresh NiMH batteries (correctly switched in back) I maybe get eight minutes. Long enough to program and mess with other functions. These didn't seem to overheat as much as the Alkaline's.

4. The receiver will gradually heat up, even if it's manually turned off.

5. With fresh batteries maybe five to eight minutes, if that.

6. Batteries used were fresh Alkaline AA or NiMH AA 2300 mah. Made sure to switch the switch in back to correspond to correct type of battery.

7/8. Even though I got it programmed I do not hear anything. The screen does show volume level. No audio. Do not hear any crackling, buzzing...Nothing.

I got this radio second hand after it stopped taking a charge.

Can not get it to show sys or groups either. Then it continues to scan through preloaded searches.
Using ARC XT Pro to program.
Think this thing is FUBAR! What do you think about a BCD396T as a substitute?

Thank you, Justin

 

[darunimal]

You are gonna burn something down we told you already you have a short inside the scanner discontinue use and send to UNIDEN for repair before someone gets hurt dude!!!

 

[dkf435]

It is already burned he is just roasting it until it is golden brown.

David

 

[Hobbyscan]

Ask for help and get chastised. Thanks. I know you already told me. Is it so bad wanting to figure something out and fix myself?

Most likely will be buying a replacement.

 

[MarkWestin]

Something to keep in mind if you don't know already. Passive components such as resistors, capacitors, inductors, (coils) rotary encoders, Pots, etc. very rarely are the cause of a problem, but rather are a symptom of a problem. Active components such as diodes, transistors, and ICs are drastically more likely to be a problem in any electronic circuit.

Mark

 

[dkf435]

The rotary control is not the problem, it is taking CPU level signal and pulsing between the CPU pins and there is no resistor in the control to be dissipating heat, if it is heating up then that means the supply from the CPU is high and something else is already fried and the more you play with it the more damage happens as others have already told you. The encoder is not the main problem.

David

 

[Hobbyscan]

Alright guys, I'm going to admit defeat on this one. Thank you for all your help.