board number ept695015a
sounds like it is in both am and ssb dont remember which trannies do the switching.
also volts don't go up when switched from am to ssb.
any help appreciated.
Thanks Jim.
Search found 62 matches
- Tuesday 5th Sep 2017, 15:31
- Forum: CB Radio Repair and Troubleshooting
- Topic: rci2970n2 bad ssb tx modulation
- Replies: 0
- Views: 5202
- Sunday 1st Nov 2009, 6:06
- Forum: CB Radio Repair and Troubleshooting
- Topic: Broken RCI 2990dx
- Replies: 1
- Views: 2979
Re: Broken RCI 2990dx
Can anyone help with this problem on this 2990dx RCI radio Main board number EPT695011A? Got a new CPU and that helped, now trying to adjust the VCO's at 24.890 Mhz neither L13 or L14 will do anything. Pin 15 of IC2 and TP10 has 5.00 volts and both should be around 2.00 volts. Can anyone tell me wha...
- Thursday 15th Oct 2009, 19:52
- Forum: CB Radio Repair and Troubleshooting
- Topic: Broken RCI 2990dx
- Replies: 1
- Views: 2979
Broken RCI 2990dx
Radio Make and Model: RCI 2990dx surface mount PCB Number: EPT695011A PLL Number: Test gear available: Scope, freq. counter, DVM, solder station Symptoms: What is working: see below What has been tried: see below Did it suddenly happen ?: Bought this way Anything else that may be of help?: Hello, Is...
- Friday 4th Sep 2009, 16:13
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI2950DX CPU-Board-fault
- Replies: 2
- Views: 3117
Re: RCI2950DX CPU-Board-fault
What you are calling the hotmelt pack plugged into CN611 is the echip which gives you 11 meters. Far as your problem goes I have no idea of the cause.
Regards, Jim
Regards, Jim
- Tuesday 21st Apr 2009, 10:05
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2990 old style onboard SWR tester wont calibrate
- Replies: 1
- Views: 2507
Re: RCI 2990 old style onboard SWR tester wont calibrate
I like to be ignored. Doesn't look like much is happening on this forum.
Thanks anyway,
Jim
Thanks anyway,
Jim
- Tuesday 14th Apr 2009, 20:13
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2990 old style onboard SWR tester wont calibrate
- Replies: 1
- Views: 2507
RCI 2990 old style onboard SWR tester wont calibrate
Radio Make and Model: RCI 2990 Old style PCB Number: ept295013z PLL Number: ???? Test gear available: DVM, Frequency counter Symptoms: Onboard SWR test doesn't Reach set point What is working: Everything else works What has been tried: Turned RF power up fully and tried to set calibration, will not ...
- Tuesday 13th Jan 2009, 21:49
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2950 NO RX SSB
- Replies: 8
- Views: 6177
RCI 2950 NO RX SSB
Only other thing I can think of is to check IC19 and C216 and C219, but I am not a tech.
Jim
Jim
- Monday 12th Jan 2009, 20:10
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2950 NO RX SSB
- Replies: 8
- Views: 6177
RCI 2950 NO RX SSB
Have you checked Q54 the SSB/CW audio switch?
Jim
Jim
- Friday 2nd Jan 2009, 20:24
- Forum: CB Radio Modifications
- Topic: MC301 & 1SS53
- Replies: 2
- Views: 3194
MC301 & 1SS53
Yes the 1ss53 is a proper replacement for the mc301 diode
Jim
Jim
- Monday 29th Dec 2008, 9:27
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2990 talk back problem, can't get it turned off.
- Replies: 2
- Views: 3213
RCI 2990 talk back problem, can't get it turned off.
Thanks anyway, I got it fixed
Jim
Jim
- Sunday 28th Dec 2008, 14:38
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2990 talk back problem, can't get it turned off.
- Replies: 2
- Views: 3213
RCI 2990 talk back problem, can't get it turned off.
Radio Make and Model: RCI 2990 PCB Number: EPT295013z PLL Number: ????? Test gear available: DVM Freq. counter, watt meter, mod meter Solder station Symptoms: Can't get rid of talk back What is working: Everything What has been tried: Checked and tested D78,D100,D47,IC16,IC19,Q41,Q42,Q45,Q52,Q53,Q55...
- Saturday 13th Dec 2008, 15:15
- Forum: CB Radio Repair and Troubleshooting
- Topic: RCI 2970 Stuck in TX mode
- Replies: 7
- Views: 5197
RCI 2970 Stuck in TX mode
If it uses a battery test the battery.
Jim
Jim
- Friday 5th Dec 2008, 2:43
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Well I think the problem must be in IC2 one of the diodes on there must be kaput.
JIm
JIm
- Friday 5th Dec 2008, 1:05
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Then R207 must be the fault.
Jim
Jim
- Friday 5th Dec 2008, 0:46
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
I believe your answer will be that you was just joking about the problem
Regards, Jim
Regards, Jim
- Thursday 4th Dec 2008, 19:14
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Well then would you test L20 and see if it is keeping its setting properly?
Also Test L19 just for fun.
HOW about FET3 that looks like a good one to test. And don't forget to test L46.
Jim
Also Test L19 just for fun.
HOW about FET3 that looks like a good one to test. And don't forget to test L46.
Jim
- Thursday 4th Dec 2008, 12:56
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Seems we have been all over the PLL area and no luck there in finding the fault.
We have proven some things and disproved others. So would you tell us whether we have been close or need to go another directio, else give us a clue.
Regards, Jim
We have proven some things and disproved others. So would you tell us whether we have been close or need to go another directio, else give us a clue.
Regards, Jim
- Wednesday 3rd Dec 2008, 23:13
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
How about testing L16 is it the cause of the noise?
Jim
Jim
- Wednesday 3rd Dec 2008, 22:44
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Have you tested L17 to see if it is working properly and is it?
Jim
Jim
- Wednesday 3rd Dec 2008, 11:42
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Seems our test giver has disappeared perhaps James and myself angered him complaining about the schematic. LOL
JIm
JIm
- Tuesday 2nd Dec 2008, 11:46
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
OK I will try once more. By the way your schematic is a little worn and I haven't found a better one so I have to look in the radio to find numbers.
Is there any noise on pins 5,8,or10 of IC2?
Would you test Caps. 80,81,90, and 92 for me.
Is there noise on pin 7 of IC3 TX mode?
Jim
Is there any noise on pins 5,8,or10 of IC2?
Would you test Caps. 80,81,90, and 92 for me.
Is there noise on pin 7 of IC3 TX mode?
Jim
- Tuesday 2nd Dec 2008, 10:29
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Well then I think this is not as esay as you thought for us. I'm about out of guesses.
Jim
Jim
- Tuesday 2nd Dec 2008, 10:10
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Have you tried a known good michrophone?
Jim
Jim
- Tuesday 2nd Dec 2008, 9:50
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Would you test C172, 173, 174, and D63, and D64
Also have you checked for solder bridges on the track side and that all solder joints are ok concerning these?
Is there any noise on pins 1,6,and 8 of IC4?
Regards, Jim
Also have you checked for solder bridges on the track side and that all solder joints are ok concerning these?
Is there any noise on pins 1,6,and 8 of IC4?
Regards, Jim
- Tuesday 2nd Dec 2008, 0:16
- Forum: CB Radio Repair and Troubleshooting
- Topic: Test your knowledge Uniden (President) Grant PC-409
- Replies: 43
- Views: 26626
Test your knowledge Uniden (President) Grant PC-409
Are the voltage readings ok at IC6? Have you tested all the electrolytic caps in the audio circuit. Since it is an old radio some of these may be faulty. Perhap I should ask, is the PA working normally and is it noisy?
I'm just guessing as usual but I try.
Regards, Jim
I'm just guessing as usual but I try.
Regards, Jim