Search found 319 matches

by zodiac
Sunday 6th Mar 2011, 3:33
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 15387

Re: President Lincoln control buttons not working

Inoperable, now there's a word I wouldn't have used. I can't say that I have, unless the processor been knackered. Scott is the expert on Lincoln’s but it doesn't help not being able to find a good schematic that isn't full of blobs and unreadable, plus there's not a lot of screen printing on the bo...
by zodiac
Sunday 6th Mar 2011, 2:00
Forum: CB Radio Repair and Troubleshooting
Topic: super star ss-36
Replies: 5
Views: 7815

Re: super star ss-36

The transistor bolted to the right hand side of the radio is the voltage regulator for the output stage and gets very hot in AM/FM mode with a constant carrier. That's going down the wrong road, what throw me was that you mention VR13 and put me on the wrong track to start with. Have you replaced th...
by zodiac
Saturday 5th Mar 2011, 13:19
Forum: CB Radio Repair and Troubleshooting
Topic: President Lincoln control buttons not working
Replies: 9
Views: 15387

Re: President Lincoln control buttons not working

All you need do is put a link as shown in the diagram to open it up.
by zodiac
Saturday 5th Mar 2011, 13:05
Forum: CB Radio Repair and Troubleshooting
Topic: super star ss-36
Replies: 5
Views: 7815

Re: super star ss-36

With no control of VR13, I would say the regulator bolted to the side of the radio has gone south.
It's centre pin should go up and down in voltage as you turn VR13 to a maximum of about 8v, otherwise you'll burn it out when used on AM and FM at full power and the final as well.
by zodiac
Wednesday 9th Feb 2011, 12:06
Forum: CB Radio Repair and Troubleshooting
Topic: FM receive on 2830
Replies: 1
Views: 3973

Re: FM receive on 2830

Well, don't know what happend to the text so I'll try again. I have a Uniden 2830, old model with 477 at the final. It has two issues, one is, with the beep switched on the radio doesn't transmit but with it off it's working fine. The other problem is with receive on FM it's been getting progressive...
by zodiac
Tuesday 8th Feb 2011, 6:04
Forum: CB Radio Repair and Troubleshooting
Topic: FM receive on 2830
Replies: 1
Views: 3973

FM receive on 2830

Radio Make and Model:
PCB Number:
PLL Number:
Test gear available:
Symptoms:

What is working:

What has been tried:

Did it suddenly happen ?:
Anything else that may be of help?:
by zodiac
Monday 17th Jan 2011, 3:07
Forum: CB Radio Repair and Troubleshooting
Topic: Superstar 3900el low FM tx audio
Replies: 9
Views: 14530

Re: Superstar 3900el low FM tx audio

John,
I misread your problem, you are asking about the TX audio and I've given you info on the RX audio for radios with the TDA2003 audio chip, sorry. :oops:
by zodiac
Sunday 2nd Jan 2011, 14:06
Forum: CB Radio Repair and Troubleshooting
Topic: rci 69ffc2 ssb audio
Replies: 5
Views: 7615

Re: rci 69ffc2 ssb audio

Yes I can understand that happening to the PSU, that radio has eight MOSFETS as the finals. I get the same thing happen when I've repaired 797 burners if I try to run one on setting 5 or 6 in FM mode, that's because my PSU is only a 25Amp so I have to bring the 50Amp PSU in from the shed and use tha...
by zodiac
Sunday 2nd Jan 2011, 3:24
Forum: CB Radio Repair and Troubleshooting
Topic: rci 69ffc2 ssb audio
Replies: 5
Views: 7615

Re: rci 69ffc2 ssb audio

Shaun, You've got yourself a dilemma there as to what to do. I think your first option is to get in touch with the supplier and explain the situation and see what they have to say, having said that they should have checked it before they posted it especial being as it's gone overseas. What internal ...
by zodiac
Monday 27th Dec 2010, 1:32
Forum: CB Radio Repair and Troubleshooting
Topic: Superstar 3900el low FM tx audio
Replies: 9
Views: 14530

Re: Superstar 3900el low FM tx audio

The drawing should help you find it.
Dave.
by zodiac
Saturday 25th Dec 2010, 12:57
Forum: CB Radio Repair and Troubleshooting
Topic: Superstar 3900el low FM tx audio
Replies: 9
Views: 14530

Re: Superstar 3900el low FM tx audio

John, You need to fit a small heatsink to the audio chip after moving it away from the chassis as it is when standard. You will also have to re-fit the large electrolytic capacitor by extending it's pins so it can be bent out of the way of the new heatsink. This work should have been done by the sel...
by zodiac
Thursday 16th Dec 2010, 4:56
Forum: CB Radio Repair and Troubleshooting
Topic: Power Supply - Voltage drop under load
Replies: 51
Views: 73295

Re: Power Supply - Voltage drop under load

Norm, I would put a note in to explain that the secondary winding voltage is 15V AC before connection to the rectifier and capacitors with 25V DC after connection to both. That should make it a lot easier to follow for those that have never done it before, it confused me the first time I built a PSU...
by zodiac
Wednesday 15th Dec 2010, 12:30
Forum: CB Radio Repair and Troubleshooting
Topic: MAJOR 788 NO TX OR RX
Replies: 4
Views: 6949

Re: MAJOR 788 NO TX OR RX

Yes it is the same board but I've been lucky and never had to work on one yet. :lol:
by zodiac
Wednesday 15th Dec 2010, 12:26
Forum: CB Radio Repair and Troubleshooting
Topic: Power Supply - Voltage drop under load
Replies: 51
Views: 73295

Re: Power Supply - Voltage drop under load

Norm,
On your diagram you show the output of the transformer as being 25VAC, is that correct ?.
Dave.
by zodiac
Wednesday 15th Dec 2010, 12:02
Forum: CB Radio Repair and Troubleshooting
Topic: MAJOR 788 NO TX OR RX
Replies: 4
Views: 6949

Re: MAJOR 788 NO TX OR RX

Check the AVR transistor Q34, it's a darlington transistor 2SD837 or replace it with a new one to be on the safe side, also check the zener diode at it's base pin at the other side of L17.
I don't know the radio but that's what I'd start with as it's the voltage regulator.
by zodiac
Tuesday 7th Dec 2010, 12:35
Forum: CB Radio Modifications
Topic: JWR MK2
Replies: 1
Views: 4583

Re: JWR MK2

A bit late but I've answered this very same question on another forum. You need to wire a resistor about 10K to pin 6 of the PLL and put the other end to 0v (GND) through a switch. The PLL now counts in 5 instead of 10, hence the 40 channels in 5KC steps and not 10KC's but god knows how low it goes ...
by zodiac
Tuesday 7th Dec 2010, 12:15
Forum: CB Radio Repair and Troubleshooting
Topic: Power Supply - Voltage drop under load
Replies: 51
Views: 73295

Re: Power Supply - Voltage drop under load

Norm, My philosophy is, if you don't ask you'll never find out and you've had a good tutor in Sue. He's answered all your questions in layman’s terms that anyone can understand and follow. I've been following the thread with interest because I've built many PSU's in the past and was curious to see i...
by zodiac
Tuesday 7th Dec 2010, 5:39
Forum: CB Radio Repair and Troubleshooting
Topic: Power Supply - Voltage drop under load
Replies: 51
Views: 73295

Re: Power Supply - Voltage drop under load

I'd like to add my thanks to you both for the questions and the answers you've both given, it's been very enlightening and educational to the workings of the most asked about piece of equipment used in CB. It will serve as a directory to anyone needing any information about their PSU in the future. ...
by zodiac
Monday 15th Nov 2010, 5:27
Forum: CB Radio Repair and Troubleshooting
Topic: Cobra 146 GTL Very low RX audio
Replies: 3
Views: 6486

Re: Cobra 146 GTL Very low RX audio

Nick,
Have you replaced C132 next to the audio IC yet.
by zodiac
Sunday 3rd Oct 2010, 11:08
Forum: CB Radio Repair and Troubleshooting
Topic: Belcom LS102L Service Manual
Replies: 2
Views: 5150

Re: Belcom LS102L Service Manual

Try CBTricks.com
Click on radio information on the front page, you'll find your radio under B for Belcom.
by zodiac
Monday 27th Sep 2010, 11:26
Forum: CB Radio Modifications
Topic: Echo Board Mod
Replies: 1
Views: 4613

Re: Echo Board Mod

You can adjust the echo and delay on the board, I think you'll find the info is on CBtricks.
by zodiac
Monday 27th Sep 2010, 11:15
Forum: CB Radio Repair and Troubleshooting
Topic: no TX on president jackson
Replies: 5
Views: 7722

Re: no TX on president jackson

I think you've been misinformed, there are no darlington transistors in the 042 boarded Jackson.
Is the TX light coming on when you key the mike ?.
by zodiac
Wednesday 1st Sep 2010, 12:03
Forum: CB Radio Modifications
Topic: nato 2000
Replies: 2
Views: 5928

Re: nato 2000

This should help you .
by zodiac
Wednesday 1st Sep 2010, 8:28
Forum: CB Radio Modifications
Topic: nato 2000
Replies: 2
Views: 5928

Re: nato 2000

If you connect a wire from the centre of the KC shift and put it to a switch, then find a variable resistor of the same value as the KC shift control, put another wire from the switch to the variable resistor and the other side of the variable to 0 v (GND). Now adjust the variable resistor for the z...
by zodiac
Saturday 21st Aug 2010, 9:12
Forum: CB Radio Modifications
Topic: Unlocking clarifier President George
Replies: 6
Views: 9195

Re: Unlocking clarifier President George

Sue, That diagram has things the wrong way round, I wired it that way and it worked the opposite way, the 33k resistor side of the control I have now got at +V. I used 5v with a 33k in line and a 1k on the other 0v side to keep the amount of shift to a minimum. This radio has a zero switching (down ...
by zodiac
Saturday 21st Aug 2010, 4:44
Forum: CB Radio Modifications
Topic: Unlocking clarifier President George
Replies: 6
Views: 9195

Re: Unlocking clarifier President George

Sue, That's exactly what I needed, the schematic or the part that shows the parts I need to see. As you say much easier to do than the explanation below. 1. Disconnect the wire in the middle of the connector J408 on the principal plate (Mother board). 2. Take off (remove) the adjustable VR211 (TX-fr...
by zodiac
Friday 20th Aug 2010, 10:22
Forum: CB Radio Modifications
Topic: Unlocking clarifier President George
Replies: 6
Views: 9195

Re: Unlocking clarifier President George

Thanks for the reply but this is not an old fashioned radio that will last for years and stand the hammering they get from normal use. This is a micro controller type radio with flimsy boards and bits of plastic holding the front together with surface mount components on the track side of the main P...
by zodiac
Thursday 19th Aug 2010, 14:25
Forum: CB Radio Modifications
Topic: Unlocking clarifier President George
Replies: 6
Views: 9195

Unlocking clarifier President George

I'm looking for good detailed information no how to unlock the clarifier on the President George. I found one site but it doesn’t make any sense and the drawings don't match the radio I have. I can't get it in to my head as to why it uses the mike gain control when it's got a clarifier control and t...
by zodiac
Thursday 19th Aug 2010, 13:55
Forum: CB Radio Amplifiers
Topic: RM KLV350 short circuits?
Replies: 6
Views: 11946

Re: RM KLV350 short circuits?

John,
Did you find the problem with the Amp ?.
I just had one in today with the same fault and it had one shorted valve.
Dave.
by zodiac
Tuesday 17th Aug 2010, 8:28
Forum: CB Radio Modifications
Topic: Cobra 148
Replies: 4
Views: 8505

Re: Cobra 148

Spectrum communications do Eproms for giving the UK's on Uniden and Cybernet SSB radios. That book will give you a basic explanation of Eprom programming with many handy tips and circuits to help you do the job but it won't give you the codes for the UK band if that's what your after, you'll have to...
by zodiac
Saturday 31st Jul 2010, 9:45
Forum: CB Radio Repair and Troubleshooting
Topic: President lincoln display/audio fault
Replies: 26
Views: 31195

Re: President lincoln display/audio fault

That's bad news, I used my last audio chip only last week, has he closed down ?.
Knights CB have them but not as cheap.
by zodiac
Tuesday 20th Jul 2010, 11:42
Forum: CB Radio Repair and Troubleshooting
Topic: President lincoln display/audio fault
Replies: 26
Views: 31195

Re: President lincoln display/audio fault

Norm,
That's expensive, I get mine from Chris at Mode Components in Birmingham, 40p plus £1 post for the LM2902N.
He also has the audio chips TDA1905 at £1.25, and that includes vat.

Daz,
For what it costs I'd change both IC's, remove the copper heat sink from the audio IC first.
by zodiac
Tuesday 29th Jun 2010, 9:18
Forum: CB Radio Amplifiers
Topic: RM KL200 distortion
Replies: 6
Views: 12216

Re: RM KL200 distortion

Philip, The reply I gave above has nothing to do with your question on the amp, don't know why I wrote that. :oops: You say your using a desk mike, when you key up without talking does the needle on the meter move to indicate power out ?. The reason I ask is that if the mike is too high it will pick...
by zodiac
Thursday 24th Jun 2010, 11:24
Forum: CB Radio Amplifiers
Topic: PALOMAR ELITE 450HD PART IDENTIFICATION
Replies: 4
Views: 9879

Re: PALOMAR ELITE 450HD PART IDENTIFICATION

I've had the same problem many times, sometimes I fix them and sometimes I don't.
Try changing the relay switching transistor and the two IN4148 rectifying diodes to the base of the same transistor, it works for me now and again but not always.
Dave.
by zodiac
Thursday 24th Jun 2010, 11:10
Forum: CB Radio Repair and Troubleshooting
Topic: Only 1 watt output
Replies: 2
Views: 5541

Re: Only 1 watt output

Don't know if it's the same radio or not but I've just had a radio in for repair from Cheshire baught cheap because it only had 1w of output and came with the same story about the thunder.
The final MOSFET had gone caput, a quick fix. :(
by zodiac
Thursday 24th Jun 2010, 10:58
Forum: CB Radio Modifications
Topic: Jummbo, GREEN LED.
Replies: 1
Views: 4448

Re: Jummbo, GREEN LED.

Found them at Rapid electronics for 80p plus vat and post, they have both red and green.
Order code 57-0178.
by zodiac
Wednesday 23rd Jun 2010, 8:57
Forum: CB Radio Modifications
Topic: Jummbo, GREEN LED.
Replies: 1
Views: 4448

Jummbo, GREEN LED.

I would like to fit a green LED to my Jumbo to match the green readout of the 3900 frequency counter display I've fitted with the radio. The red one now looks out of place and odd. The trouble is finding one and yes I know the Excalibur has the green LED but would you scrap one just for the LED.
Dave.
by zodiac
Sunday 20th Jun 2010, 6:53
Forum: CB Radio Repair and Troubleshooting
Topic: uniden pc55 no tx.
Replies: 1
Views: 4474

Re: uniden pc55 no tx.

Mike,
That's the VCO, have you tested it for being open circuit as it's only got one coil inside of it and I've never had one go open circuit yet.
If it is open circuit then have you been in touch with UNIDEN to see if they have any.
Dave.
by zodiac
Thursday 17th Jun 2010, 11:19
Forum: CB Radio Modifications
Topic: 88081 Eprom conversion board - any info?
Replies: 10
Views: 13436

Re: 88081 Eprom conversion board - any info?

Norm, The Eprom board now looks to me like one of Spectrum communications Eprom boards with the 5v regulator soldered to the board and then screwed to the chassis to hold it in place and the number will probably be a date code. The pull function on those controls is a complete waist of time, because...
by zodiac
Wednesday 16th Jun 2010, 9:57
Forum: CB Radio Modifications
Topic: 88081 Eprom conversion board - any info?
Replies: 10
Views: 13436

Re: 88081 Eprom conversion board - any info?

Norm, That Eprom board looks very very much like one of mine but the audio mod is not, if it is one of my Eproms it'll have DZ63 on it somewhere. A closer photo of each mod might be better as that one looks like what I do with the web cam, crap to say the least. Be very careful when altering the ban...
by zodiac
Tuesday 15th Jun 2010, 12:51
Forum: CB Radio Modifications
Topic: 88081 Eprom conversion board - any info?
Replies: 10
Views: 13436

Re: 88081 Eprom conversion board - any info?

Well you could use a 2732, that has the capability of 64 bands or a 2764 with 128 bands, is that enough for your Jumbo ?. I have an Eprom that'll do 25.615 to 27.855 and the UK's that's 6 bands but you have to extend the VCO, not an easy job, it requires a very small 12v drill and a lot of patience....
by zodiac
Tuesday 15th Jun 2010, 9:04
Forum: CB Radio Modifications
Topic: 88081 Eprom conversion board - any info?
Replies: 10
Views: 13436

Re: 88081 Eprom conversion board - any info?

Hi Norm,
The smallest Eprom I use is the 2716, it has enough room to give you 32 bands. How many do you need ?. :D
Dave.
by zodiac
Monday 14th Jun 2010, 14:30
Forum: CB Radio Modifications
Topic: 88081 Eprom conversion board - any info?
Replies: 10
Views: 13436

Re: 88081 Eprom conversion board - any info?

Norm, With old radios like yours that have been around for some time, you'll find they have been to many rig doc's over the years, each one having done a different conversion for each of it's owners. I'd have banded it with an Eprom and used two crystals, one just to give the offset for the UK band ...
by zodiac
Monday 14th Jun 2010, 14:15
Forum: CB Radio Amplifiers
Topic: PALOMAR ELITE 450HD PART IDENTIFICATION
Replies: 4
Views: 9879

Re: PALOMAR ELITE 450HD PART IDENTIFICATION

Mike,
Can you give a little more info as to the location of the resistor in the amp, as someone may be able to help you.
by zodiac
Monday 14th Jun 2010, 13:59
Forum: CB Radio Repair and Troubleshooting
Topic: Replace MB8719 with MC145106
Replies: 4
Views: 10458

Re: Replace MB8719 with MC145106

Nick,
I have a couple of PLL's for the MK1 148 second hand, if you want one PM me with your Email address and we'll sort you one out.
Dave.
by zodiac
Sunday 6th Jun 2010, 10:15
Forum: CB Radio General
Topic: Raider 18 - 78 WTF is this
Replies: 2
Views: 7403

Re: Raider 18 - 78 WTF is this

I'd just remove the final and use the rest for parts.
Dave.
by zodiac
Sunday 6th Jun 2010, 10:10
Forum: CB Radio Repair and Troubleshooting
Topic: President lincoln display/audio fault
Replies: 26
Views: 31195

Re: President lincoln display/audio fault

That doesn't sound too healthy to me, I think it'll be coming your way very soon Scott.
Dave.
by zodiac
Sunday 6th Jun 2010, 9:53
Forum: CB Radio Repair and Troubleshooting
Topic: Ham Jumbo Alignment Problem
Replies: 4
Views: 10352

Re: Ham Jumbo Alignment Problem

Norm, You said it's got variable power, so the adjusters two large white pots may have been removed, they are the pots for high and low power in AM and FM mode and I think one is VR8. The VR8 your talking about is on the main 059 board the other two are fitted on the chassis left side in front of th...
by zodiac
Saturday 29th May 2010, 9:19
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 18903

Re: President Grant - Clarifier Shift

Steve,
Have you sorted it yet ?.
by zodiac
Thursday 27th May 2010, 9:03
Forum: CB Radio Repair and Troubleshooting
Topic: President Grant - Clarifier Shift
Replies: 15
Views: 18903

Re: President Grant - Clarifier Shift

Erruummm, well that's all i did with the black ones, just fit the diodes and tune up. Did you look at the diode before you fitted it, it should have ITT310 or 410 on them. The reason I say that is because a IN4148 diode will work as a varactor but it won't shift as much and it sounds like that's wha...