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Re: help for buddygunzz's 2510 problem

R

Rogerbird1

Well-Known Member
Apr 24, 2002
522
117
53
Massachusetts
rogerbird.tripod.com
You Wrote:

"I have sound and rx now...found a bad solder joint from IC107 to the board......



still have no transmit, nothing on the meter, sound does mute when i key..have power from Q125, nothing to IC106, R172-R173-R174 according to the schematic..but the block chart shows something different



this is my first radio project and probably my last for a while(lol)



what should i check next, the problem is a little different now ...any ideas???



thanks again

buddygunzz "

======================

Hi,

Did you say if the TX indicator comes on when you key?



Lets see if I can help,

I have posted the Voltage charts for IC's and Transistors on my website.

Rogerbird.tripod.com



** NOTE: I corrected the Charts today- 2/3/04 - I noticed a Major Mistake - swapped Collector and Base.. Sorry...



Ok, Here goes:

I know you said your getting voltage from Q125..It should be:



Q125 the TX Switch transistor..

TX Emitter Should be: 7.3v

Collector Should be: 7.8v

Base Should be: 8.0v



RX Emitter Should be: 7.3v

Collector Should be: 0.0v

Base Should be: 8.0v



Now if thats good, You should check the Tx Chain,

Check the collectors of Q124, Q133,& Q132.

Q124 C= 7.8v in TX

Q133 C=12.3v in TX

Q132 C= 11.5v in TX

Voltages are approx.



If those seem correct, check to see if the Bias current is good,



Remove the B002(PB-100) from the Main PCB.

Connect a DC Ammeter (+) to TP4, (-) to TP3.

Adjust VR112 for 50mA reading on the DC Ammeter.

Connect a DC Ammeter (+) to TP4, (-) to TP2.

Adjust VR113 for 50 mA reading on DC Ammeter.



If those are way off or not adjustable you may have damaged Bias Diodes or Finals.



Lets see what that gives us..



Roger


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=rogerbird1>Rogerbird1</A> at: 2/4/04 2:14 am
 

You Wrote:

"I have sound and rx now...found a bad solder joint from IC107 to the board......



still have no transmit, nothing on the meter, sound does mute when i key..have power from Q125, nothing to IC106, R172-R173-R174 according to the schematic..but the block chart shows something different



this is my first radio project and probably my last for a while(lol)



what should i check next, the problem is a little different now ...any ideas???



thanks again

buddygunzz "

======================

Hi,

Did you say if the TX indicator comes on when you key?



Lets see if I can help,

I have posted the Voltage charts for IC's and Transistors on my website.

Rogerbird.tripod.com



** NOTE: I corrected the Charts today- 2/3/04 - I noticed a Major Mistake - swapped Collector and Base.. Sorry...



Ok, Here goes:

I know you said your getting voltage from Q125..It should be:



Q125 the TX Switch transistor..

TX Emitter Should be: 7.3v

Collector Should be: 7.8v

Base Should be: 8.0v



RX Emitter Should be: 7.3v

Collector Should be: 0.0v

Base Should be: 8.0v



Now if thats good, You should check the Tx Chain,

Check the collectors of Q124, Q133,& Q132.

Q124 C= 7.8v in TX

Q133 C=12.3v in TX

Q132 C= 11.5v in TX

Voltages are approx.



If those seem correct, check to see if the Bias current is good,



Remove the B002(PB-100) from the Main PCB.

Connect a DC Ammeter (+) to TP4, (-) to TP3.

Adjust VR112 for 50mA reading on the DC Ammeter.

Connect a DC Ammeter (+) to TP4, (-) to TP2.

Adjust VR113 for 50 mA reading on DC Ammeter.



If those are way off or not adjustable you may have damaged Bias Diodes or Finals.



Lets see what that gives us..



Roger


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=rogerbird1>Rogerbird1</A> at: 2/4/04 2:14 am
 
thanks roger...yes the tx does show on the display..i will check those out and post the results later



thanks again,your a great BIG help!!!<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin">


</p>
 
thanks roger...yes the tx does show on the display..i will check those out and post the results later



thanks again,your a great BIG help!!!<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/roll.gif ALT=":rollin">


</p>
 
"

i made a problem also,,2 wires from ic107- 1 wire to RIT PCB board, 2nd wire ? has 12.V before resister the has 8V..it is some MOD that i cant't figure out where it goes(YES it was connected)..mods that i know about is the channel guard and the hi/low power switch..PA it the guard on/off & the tx is hi/low power"



This could be a Clarifier (RIT) mod.. Rit Mod III on my site??

www.cbtricks.com/~rogerbird/2510/rit.htm



Roger


</p>
 
"

i made a problem also,,2 wires from ic107- 1 wire to RIT PCB board, 2nd wire ? has 12.V before resister the has 8V..it is some MOD that i cant't figure out where it goes(YES it was connected)..mods that i know about is the channel guard and the hi/low power switch..PA it the guard on/off & the tx is hi/low power"



This could be a Clarifier (RIT) mod.. Rit Mod III on my site??

www.cbtricks.com/~rogerbird/2510/rit.htm



Roger


</p>
 
Note:

Q132(MRF477) pin out is:

____

| O |

[ 477 ] Facing Front

| | |

B E C



Q133 (2SC2166) Pin out is:

____

| O |

[ 2166 ] Facing Front

| | |

B C E



Q124 (2SC1973-SSB) Pin out is:

___

| 1973| Flat Front

| | |

E B C



Q125 (2SC525C) Pin out is:

___

| 525 | Flat Front

| | |

B C E



In case you were measuring the wrong places..

You wrote:

"Q125 the TX Switch transistor..

TX Emitter Should be: 7.3v

Collector Should be: 0.0v <--- This is A Problem.

Base Should be: 8.0v



RX Emitter Should be: 7.3v

Collector Should be: 0.0v

Base Should be: 8.0v



this is the lastest readings"



Q125 is the TX Voltage Switch.

Check C130 it is an electrolytic cap and could be shorted. it is on the collector of Q125. Or Q125 may be bad.







Roger


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=rogerbird1>Rogerbird1</A> at: 2/3/04 12:40 am
 
Note:

Q132(MRF477) pin out is:

____

| O |

[ 477 ] Facing Front

| | |

B E C



Q133 (2SC2166) Pin out is:

____

| O |

[ 2166 ] Facing Front

| | |

B C E



Q124 (2SC1973-SSB) Pin out is:

___

| 1973| Flat Front

| | |

E B C



Q125 (2SC525C) Pin out is:

___

| 525 | Flat Front

| | |

B C E



In case you were measuring the wrong places..

You wrote:

"Q125 the TX Switch transistor..

TX Emitter Should be: 7.3v

Collector Should be: 0.0v <--- This is A Problem.

Base Should be: 8.0v



RX Emitter Should be: 7.3v

Collector Should be: 0.0v

Base Should be: 8.0v



this is the lastest readings"



Q125 is the TX Voltage Switch.

Check C130 it is an electrolytic cap and could be shorted. it is on the collector of Q125. Or Q125 may be bad.







Roger


</p>Edited by: <A HREF=http://pub86.ezboard.com/bworldwidecbradioclub.showUserPublicProfile?gid=rogerbird1>Rogerbird1</A> at: 2/3/04 12:40 am
 
You Wrote:

Q124

RX _E__B__C

___0.0_0.0_0.0



TX_E__B__C_

__0.4_7.2_0.8_



Is that actually?

RX _E__C__B

___0.0_0.0_0.0



TX_E__C__B_

__0.4_7.2_0.8_



If so, That is Right.. and the rest look good.



I had to update my Transistor voltage charts on my Site, I noticed I swapped the Collecor and Base Headings..

It is right now. (2.3.04)



Also: you wrote: still cant't figure the WIRE out..possible to the tx switch for hi/low power?



Please explain the wires again.. It sounds like its a Clarifier mod with a Lock switch.. (to lock back to Center slot)



Roger


</p>
 
You Wrote:

Q124

RX _E__B__C

___0.0_0.0_0.0



TX_E__B__C_

__0.4_7.2_0.8_



Is that actually?

RX _E__C__B

___0.0_0.0_0.0



TX_E__C__B_

__0.4_7.2_0.8_



If so, That is Right.. and the rest look good.



I had to update my Transistor voltage charts on my Site, I noticed I swapped the Collecor and Base Headings..

It is right now. (2.3.04)



Also: you wrote: still cant't figure the WIRE out..possible to the tx switch for hi/low power?



Please explain the wires again.. It sounds like its a Clarifier mod with a Lock switch.. (to lock back to Center slot)



Roger


</p>
 
The Bias Adjustment issue..

Probably either bad Bias Diodes or a bad Final or Driver.

I would disconnect one leg of each Bias Diode and OHM them out.

You should get between 500 and 1600 ohms one way and open the other.



The Wire Issue...



Sorry... Clear as Mud!...

Lets see...

The 2 wires from Ic107.. One to the RIT board on the connection where the Orange Wire should be(Same orange Wire that normally goes to the 4 pin connection on the main PCB. The RIT mod disconnects that orange wire and substitutes it for the new wire from IC107 - 8v constant in TX and RX).

Second wire from IC107 has 21k resistor on it(in line). Does this wire connect to the other pin of IC107 (12v side)?

Does the Channel Guard have a 12v or 8V connection to it? (it should, Could be the feed for the CG)

Does the Hi/Low mod work now? The mystery wire may be one of the supply feeds to the Hi/Low power mod..



and could be something totally different...



Roger




</p>
 
The Bias Adjustment issue..

Probably either bad Bias Diodes or a bad Final or Driver.

I would disconnect one leg of each Bias Diode and OHM them out.

You should get between 500 and 1600 ohms one way and open the other.



The Wire Issue...



Sorry... Clear as Mud!...

Lets see...

The 2 wires from Ic107.. One to the RIT board on the connection where the Orange Wire should be(Same orange Wire that normally goes to the 4 pin connection on the main PCB. The RIT mod disconnects that orange wire and substitutes it for the new wire from IC107 - 8v constant in TX and RX).

Second wire from IC107 has 21k resistor on it(in line). Does this wire connect to the other pin of IC107 (12v side)?

Does the Channel Guard have a 12v or 8V connection to it? (it should, Could be the feed for the CG)

Does the Hi/Low mod work now? The mystery wire may be one of the supply feeds to the Hi/Low power mod..



and could be something totally different...



Roger




</p>
 
THe manual shows then as MV1YHS,

or MV-1YH-S

Uniden PN: BDFY0058001 (Varistor)



I think in Galaxy radios they use 1n4148's.. and for the MRF455 mod I have used 1N4001's.



I do not know of a 'Tried and True' substitute for it.



In the new Lincoln's they us a Surface Mount transistor as the Bias Diode (use 2 of the 3 leads)

Also in later 2510's they used similar Surface mounted Transistors on a Small PCB with 2 leads much like the older ones. (in size and fit)



Anyone have success with a replacement??



We all would like to know..

Roger




</p>
 

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