A friend of mine wanted me to see what I could do with this one. I told him I'd try.
Issue:
No transmit whatsoever.
No receive (when I turn it on, I do hear the speaker come on).
After checking it out, I found the following:
Shorted passthrough regulator.
Shorted AF regulator.
Small cap in front of passthrough blown in half.
Trace burnt after the AF regulator.
C204 (next to driver bias VR) blown in half.
Several traces burnt in half in front of driver.
After repairing all the above, I still have no transmit signal at all. The final bias' will adjust fine up to the specs, but the driver shows zero no matter where you turn the driver bias VR.
Driver checks fine,
Finals check fine,
Pre-driver checks fine,
Diodes mounted on finals all show good,
Antenna connection is fine,
Passthrough section now working,
Driver VR tests as a 1k ohm variable,
All parts in front of driver tests fine,
I think this radio is a lost cause, lol...
Checked frequencies off of TP3, all show higher than 16.69mhz. From the looks of the bottom of the board, someone had fun with their soldering iron and razor blade.
Here are some pics of the board (trace side). What do you all think, fixable?
8v regulator & Audio section
PLL & Adder section
Passthrough section
Output section
Issue:
No transmit whatsoever.
No receive (when I turn it on, I do hear the speaker come on).
After checking it out, I found the following:
Shorted passthrough regulator.
Shorted AF regulator.
Small cap in front of passthrough blown in half.
Trace burnt after the AF regulator.
C204 (next to driver bias VR) blown in half.
Several traces burnt in half in front of driver.
After repairing all the above, I still have no transmit signal at all. The final bias' will adjust fine up to the specs, but the driver shows zero no matter where you turn the driver bias VR.
Driver checks fine,
Finals check fine,
Pre-driver checks fine,
Diodes mounted on finals all show good,
Antenna connection is fine,
Passthrough section now working,
Driver VR tests as a 1k ohm variable,
All parts in front of driver tests fine,
I think this radio is a lost cause, lol...
Checked frequencies off of TP3, all show higher than 16.69mhz. From the looks of the bottom of the board, someone had fun with their soldering iron and razor blade.
Here are some pics of the board (trace side). What do you all think, fixable?
8v regulator & Audio section
PLL & Adder section
Passthrough section
Output section
