The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Rick

I have new ones but they are not cheap.

Rick

This link may help you.
http://www.cbtricks.com/miscellaneous/f ... /index.htm

Rick

What is the voltage at the base, collector, emitter of TR24 in TX? What is the voltage at Pin 12 of the PLL (uPD858). I do not thank you are testing the on Pin 11 of the PLL., if you are then you have a bad PLL IC. To help you ID the right Pin in is connected to the collector of TR31 and the junctio...

Rick

So did you try the radio on ext power supply? What is the voltage at the base, collector, emitter of TR24? What is the voltage at Pin 12 of the PLL (uPD858). Is the voltage at TP12 or Pin 11 of the PLL when you change channel? and what is the voltage on channel 1? and channel 40? The Gray wire probl...

Rick

I do not like getting to technical, but there is not that easy to answer. Impedance is not Resistance. Impedance is more complex than resistance because of the effects on a tune circuit. You may find this article may help you understand impedance. http://forum.ecoustics.com/bbs/messages/34579/131527...

Rick

There is no way you can get a crystal to move 30KHz or even 10KHz.

Rick

Looks like you did not bother reading the Announcement: Read This Before Posting.

Rick

You would turn it on, as the input capacity is hi, and a very hi impedance at 27 MHz.

Rick

Check TR24, and is the dimmer working?
Have you tried the radio on ext power supply?

Rick

Ok the fault is not in NB circuit.

The fault is in the ANL circuit, I should have remembered this circuit is not used in SSB mode.

Check, D16, D17, D18, and C57, It may be D18 is leaking, it probably best to just change all the parts and see what gives.

Rick

If you are looking to do the job right, you need to setup the PLL section using a standalone frequency counter. You may get away using the onboard frequency counter, but if anyone as adjust the carrier frequency or the counter in self then you readings will be wrong. It always best to setup using th...

Rick

I may have a new one, I will have a look and let you know.

Rick

Try unsoldering on end of R8 and try the radio to see if the fault still there.

Rick

Please use Post Subject.

What is the voltage at the base for Q3 with NB switched no and off?
What is the voltage at the base, emitter, and collector of Q5 with NB switched no and off?
What is the voltage at the base, emitter, and collector of Q6 with NB switched no and off?

Rick

Try adjusting L2 and check D1, D2 and D3.

Rick

That why we ask for the PCB number.

On the PC-411, check C72, C73, C74, and D65.
Also, check the voltage base and collector at TR13 with the squelch on and off.

Rick

It sound like someone as replace.
Try post a picture as this may help.

Rick

Please use the Post Subject.

Check the voltage at each side of L11 in FM TX mode, if no volts check the mode switch as you may find a broken wire or a bad mode switch.

Good luck lots of wires around the mode switch.

Rick

With the voltages, you gave me it was obvious what the fault was. That why I ask you which VR have you tried to adjust the clue was in the question. I could have just told you to check for cold solder joint or open circuit VR, but would not help you fault finding in the future. ……..Check voltages te...

Rick

I do not think it is Q36 as it is only used in AM mode. I think you need to check if there is 13.8 vdc at the collector of Q9 and Q10 in FM TX mode. If the volts are missing at Q10, check choke L11 that is known to burn up or as Timrim says, it could be a bad final but I would test it first, as ther...

Rick

Because you did some much cross posting I lost the plot and the will to help you, if read my reply in post www.radiomods.co.nz/forum/viewtopic.php?t=2369 you will see what I told you.

The End.

Rick

It looks like you did not understand my last question.
If you need help you need answer only the question, you are asked.

What VR have you tried to adjust?

Rick

What is the voltage at the Base and Collector of TR51 with the power switch in Low, Mid and Hi?

What is the voltage at the Base TR49 with the power switch in Low, Mid and Hi?

Rick

With the Uniden 510 only being an AM radio, it is not worth the effort doing a MOSFET conversion.

Rick

The President George is not current model, it was discontinued some 3 year ago. You would be better off with a Cobra 148GTL-DX MK2. The Cobra is easy to work on where the President George is SMT radio. The President Lincoln is ok but now hard to get parts for and a pricey PA transistor, if you can g...

Rick

You do not say what the PCB number is, but if it’s a PC385, try changing C24 and C27.

Rick

If it is stuck on hi power, try changing TR51.

Rick

So its working ok now then?

Rick

hey rick, the fellow from the trucksite has asked me to ask you is there anymore parts involved with the 200gtl clarifier or is it just that certain crystal or xtal 2 you said any resistors or caps or is it just the xtal, thanks david nsw australia Cross posting just gets you ignored. Keep in the p...

Rick

hamguy2 wrote:hi rick, i got the crystal ordered is thats all thats needed there was any resistors or diodes needed at all with that or is it just the crystal, thanks david

Cross posting just gets you ignored.
Keep in the post you started with.

Rick

hi rick, that truckshop you give me info on about the crystal ,he was wondering was there any other parts than just the xtal that needed adding ,he asked me to ask you about that any resistors diodes etc or is it just the xtal you told me about needs fitting to fix up 26mhz ,thx hamguy2 nsw Cross p...

Rick

There is no way to improve the dynamic range of any CB type radio by 6db, this figure as been band around the Internet for the few years and by some people who have not done any test. See www.radiomods.co.nz/forum/viewtopic.php?t=1188 as you may gleam some more info there. You will see some improvem...

Rick

All voltages to be taken with the mirror board in place and Power control fully CW.
What voltages do you have around Q65 in AM and FM
The base voltage of Q65 should change if you adjust VR15 adjust, and there fore change the collector voltage, if not check Q65.

Rick

So what voltage do you have at TP8 in AM? and can you the voltage with VR15.

The radio may have some crude AM swing mod, check the components for any non stock parts.

Rick

Why not use BB809.
As they are easy find.
BB119 was made by Philips back in 1993 is no longer made.
I may have some old but new stock, I will have a look and let you know.

Rick

A common fault, 9 times out of 10 it’s the two finals have gone low gain, but before you change them check the voltage at TP8 in AM/ FM, and SSB. Adjust VR15 AM/FM APC for 5.60 volts at TP8 Adjust VR19 SSB APC for 12.40 volts at TP8 With the above settings, you should get 10 watts on AM/FM and 25 wa...

Rick

TR54 is only switch on in the FM mode. Have you removed the finals as they was bad? I think you need to gover the voltage chart again. You will find a voltage chart at the link below, this is for a Galaxy DX88, but this is the same main PCB EPT360014B and all voltage are the same. http://www.cbtrick...

Rick

Common fault, change xtal X2. X2 is a special xtal and you can not you any old xtal.

The only place I know where you can get the xtal is Truck King in the UK.
www.truck-king.co.uk

If you email them, tell them Rick put you on to them.

Rick

On one side of the LED display, you will find a number like LA4022-11, different Manufacturer have different codes like BD???? LA???? MSD???? UR???? and so on. You will also need to know if the display is common Cathode or Anode. The datasheet link below may help. http://www.datasheetcatalog.org/dat...

Rick

Do not go of the Galaxy Saturn voltage chart as it as a few errors. All test should be done with the jumper board out and the RF power control to fully CW. It looks like TR51 is bad and is why you are getting bad voltage readings. It would be best to test TR51 before you do any more, you can find th...

Rick

If it would be best to go and checkout the transistor voltage, TR49, TR50, TR,51, TR52, TR53, and TR54. You will find a voltage chart at the link below, this is for a Galaxy DX88, but this is the same main PCB EPT360014B and all voltage are the same. http://www.cbtricks.com/radios/galaxy/dx88hl/dx88...

Rick

First try unsoldering one end of R101.
Also check the voltage on the collector of TR21.

Rick

Ok it maybe right now but before you replace any parts you need to make sure that the Pass regulator TR51 is working ok. 1. Make sure the RF power control on the front of the radio is turned fully CW. 2. Remove the jumper PCB from TP7, TP8, and TP9. 3. Check the voltage at the collector of TR51 in A...

Rick

Ok try adjust VR13 and check to see if the voltage at the base, collector, and emitter of TR50 is now changing has you adjust VR13.

Rick

This is not good guessing what it maybe or may not be, until you have realigned the RX strip, 90% of old radio RX faults are down to alignment.

Rick

When you post can you put the reference in the Subject line as it make it easy to track the post.

R238 and R239 should both be 5K6, you need to put this right as this will through all the voltage reading out.
Also, check the voltage at each side of R237 in the TX mode.

Rick

Make sure the RF power control on the front of the radio is turned fully CW.
Then try adjusting VR13 while checking the voltage at each side of R238.

Rick

The voltage are not right, so before you do any more reset VR13 in AM TX so the voltage at TP9 5.60 volts with the jumper out.

Then check the voltages at TR49, TR50, TR51, and TR52 in AM TX with the jumper out.

Also check the voltages at TR49, TR50, TR51, and TR52 in SSB TX with the jumper out.

Rick

If you are taking the voltage reading correctly?
If so then it looks like you have a bit more than just the finals and TR51 bad.
I would check the voltages at TR49 and TR50 in AM TX with the jumper out.
I would check the voltages at TR52 in SSB TX with the jumper out.

Rick

Ok then it looks like TR51 is also bad.
Check the voltage on the Base, Collector and Emitter of TR51 and let us know what you find.

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