Magnum S680 List of Adjustment Pots Needed

[Wire Weasel]

Recently picked up an S680. CB Tricks has everything EXCEPT Service Manual. Rig came from a local and he says he thinks he remembers de-tuning the max power p.e.p. a bit for his purposes but can't remember which adjustment it was. Rig is doing just under 60w p.e.p. but should be capable of hitting around 80. - I have the pots for adj. Hi & Low on the dead key, those are VR13 & 16. Supposedly there is a separate adjustment for max p.e.p. but I do not know that for sure. Does anyone know which one that would be, and can someone link to a List of ALL adjustments on this radio?

Please don't bother referencing schematic at cbtricks. I'm not an engineer and can't decipher what adjustment does what from a schematic. Looking for a spelled-out list

Thanks for any help

 

[fourstringburn]

Golden screwdriver alert! Sorry, I couldn't resist.

Is 20 watts PEP going to make much difference? The deadkey swing ratio on AM is more important and should be 4:1. If you get 80 watts on peak, then deadkey should be 20 watts. At 60w, 15 watts deadkey. etc.

FACT: You have to increase power 4 times to get another signal strength on the other end. 80 to 60 watts won't be noticed. It will take another 180 watts to get real gain from a 20 watt difference.

The peak power should come from balancing the high/low pots relevant to the RF power knob setting on the front of the radio for best ratio. Increasing voltage at the finals will only cause more heat and shorten the life of the finals. Leave those adjustments alone and have fun with your radio!

 

[Robb]

WW:
If it looks like this chassis in the picture; then the tuning coils will be on the left/rear corner of the radio within the red circle:

 

[fourstringburn]

WW:
If it looks like this chassis in the picture; then the tuning coils will be on the left/rear corner of the radio within the red circle:

View attachment 20761

I know you are knowledgeable on radio repairs and tunings but those pots look more like Rx and Tx frequency alignment rather than TX power adjustments. Also someone with minimal experience is likely to screw it all up.

 

[Robb]

I am new to radio troubleshooting, repair, and alignment (last six years). But that doesn't mean that I haven't learned a few things. If you look at the picture above, you will note that the numbers of the coils are L40, 42, 43, and 44 respectively. This is the typical locations for TX alignment of many radios even tho the numbers may be different. You will also note their proximity to the location of the IC responsible for output mixing.

 

[9C1Driver]

Information for a regular Magnum S6 should be pretty much the same if they have the manual for that one.

 

[sonoma]

why not contact Magnum for the service manual. they are good about emailing you this item for your radio.
look at the S9 radio and see if the layout is the same. looks like it is.

http://www.cbtricks.com/radios/rflimited/magnum_s9/magnum_s9_c1969_adj.htm