98VHP no am transmit

[griz]

I am working on a98vhp it does not have am tx but the ssb works, checked the voltages on Q54 on ssb they where B=13.45 C=12,35 E=13,25 then when I switch to am I lose the voltage on the collector what am I missing any help thank you

[sonoma]

change it out and see what it does. looks like it is failing on AM

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[griz]

I have all ready changed it and Q55 same thing

[sonoma]

if you put a good one in and no voltage now I am at a loss on this one.

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[griz]

Will try another tomorrow one might have a bad one

[sonoma]

are you checking the voltage in TX mode on AM. it should have about 6.5 volts on TX in AM mode

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[griz]

Yes I am checking on am in transmit mode there is o volts I switch it to ssb I have 10.30 vlolts

[sonoma]

you need the 6.5 volts in TX mode for AM to function. so you have a problem there. I would verify the trans is good.

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[griz]

I took one out of a working connex 3300hp and still the same I checked the voltage on am tx it is 0.02 volts and I noticed on ssb that I get a dead key of 55 watts

[sonoma]

there is 3 main trans right there in the circuit. check all 3 parts and the diodes etc right in that area here is a link to the pic of the board. I will also post a voltage chart here for you to check voltages with.
http://www.cbtricks.com/radio ... ut_top.gif

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[sonoma]

well I can not get the voltage chart to load. can you send me your email in a PM and I will send it to you in a email. it is showing the file to be too large.
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