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which board number is printed on it dan? i cannot find a concrete manual for the model either, but if it is an ept3600-XX is an usual model and i have several schematics and service manuals that can cover it.
In one of cbtricks clones theres some info...
Not sure if you checked already, dont see nothing about that in previous posts, but have that model an FL1 455Khz Filter? did you checked? that filter can kill your AM and FM RX audio if going bad.
Dones anyone have service manual for that cobra marine VFH rig? i have 2 of them on my desk with not standard faults and im struggling to follow circuits (SMDs) without the schematic / service manual.
Thx very much
Do
Dont worry friend, looking cb radios with same pll I discovered that teaberry stalkeriv viii is the same radio and service manual is available in internet.
Thx for the interest :)
¿Is it happening in all bands or only in some of them?
I should follow the alignment procedure described in service manual (specially TX part), before pulling components (can be hard and risky to pull out some components as you says). J2002 is the connector where exciter signal feeds PA Unit...
I woud start looking the response from Andy at previous thread (he is the master :) ), check that area first. Is it the final stage Collectors being feeded in AM mode?
I have seen several times, some component in that area defective (you can start with the pot for regulating AM power to see if...
Thats what i tried to mean too, see if TR32 oscillator is working (not seeing only voltages, see if freq is being delivered) . I have seen cristals not working, capacitors, colis on that area in several radios causing problems.
Regards.
Have you checked both source oscillators for the mixer? Its clear that you tested VCO seeing that is generating the frecuency needed. Did you checked the Carrier Oscillator (the second one and only used in TX when in AM mode) to see if the second necesary freq to be mixed with VCO one, is being...
Hi mates, i have seen serveral videos from some channels that i follow in youtube about cb radios repairs and i'm observing one power modification i can understand but im not sure about potential risk.
A sample in min 19 more or less in that video:
What i can see (i believe): that tech, is...
Thx Andy as always, something to learn in each of your post.
Some other ideas (if not checked already), bassed in experiences with some rigs:
Did you check that VR14 is not "open" (is it within specs?). I had one rig in which, this pot was "open", i mean out of spec with a resistance much...
I follow both on YouTube are very very good channels (but Mr carlson is being focusing on pantreon audience more and more I think, which is fine, it's his time and effort, if he wants and can do that) . TRX Bench in my opinion, is the best and most didactic channel for Ham radio in youtube. His...
Did you check signal path from final to antenna connector? Check if RF is present at finals, if yes, check the path to antenna connector, starting with coils in that path. I have seen several times the first coil after final transistor open. Check it.
Exactly, it's not a galaxy one it is the showed on those pictures mate. I could not find service manual or schematic. I will try more finding next days in weekend (it's when I have time for that as hobby)
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