Got a Connex CX-3300HP dual final with a weird issue in receive, possibly xmit also:
Reason for coming to me:
Running hot, xmit sounds fine for a bit, then starts to muffle slightly. Receive is sluggish when in-keying mic.
All caps checked out fine, passthrough regulator was weak. Diode and resistor strapped across regulator. Swing mod at R238. TR32 removed. R249 removed.
1. Replaced all missing components, removed Swing mod at R238 and the one on the regulator.
2. Replaced passthrough reg.
3. Replaced AF reg.
4. Replaced 2 filter caps (1000uf).
5, Replaced 330uf cap beside passthrough.
6. Completely realigned.
7. Bias readjusted.
8. Dead Keys reset.
Results:
Receive still sluggish to recover after un-keying mic or nearby strong station un-keys.
Xmit sounds great now, regulator not running hot, warm, but not hot. Although I did notice after 20 seconds of holding the key down and modulating that the power drops. Anytime I key up after that incident, the power stays at that reduced level.
Turn radio on, let warm up for 15 minutes, key up first time and power swings to 32w peak from an 8w deadkey. After 20 seconds of holding that key and modulating, the swing drops down to 20w peak and a deadkey of 6w. Average power no noticeable change.
I've checked for loose, cracked, lifted solder joints. I've looked for loose ground connections. Bias stays stable. Power VR stays stable.
Noticed my power supply amperage scale jumps from 3.5a idle to 7a when I key up and goes to 10a when I modulate. Sounds like a short somewhere. Checked finals, and strap diodes, they check fine. All coils seem firm. So-239 firm.
Any suggestions?
Reason for coming to me:
Running hot, xmit sounds fine for a bit, then starts to muffle slightly. Receive is sluggish when in-keying mic.
All caps checked out fine, passthrough regulator was weak. Diode and resistor strapped across regulator. Swing mod at R238. TR32 removed. R249 removed.
1. Replaced all missing components, removed Swing mod at R238 and the one on the regulator.
2. Replaced passthrough reg.
3. Replaced AF reg.
4. Replaced 2 filter caps (1000uf).
5, Replaced 330uf cap beside passthrough.
6. Completely realigned.
7. Bias readjusted.
8. Dead Keys reset.
Results:
Receive still sluggish to recover after un-keying mic or nearby strong station un-keys.
Xmit sounds great now, regulator not running hot, warm, but not hot. Although I did notice after 20 seconds of holding the key down and modulating that the power drops. Anytime I key up after that incident, the power stays at that reduced level.
Turn radio on, let warm up for 15 minutes, key up first time and power swings to 32w peak from an 8w deadkey. After 20 seconds of holding that key and modulating, the swing drops down to 20w peak and a deadkey of 6w. Average power no noticeable change.
I've checked for loose, cracked, lifted solder joints. I've looked for loose ground connections. Bias stays stable. Power VR stays stable.
Noticed my power supply amperage scale jumps from 3.5a idle to 7a when I key up and goes to 10a when I modulate. Sounds like a short somewhere. Checked finals, and strap diodes, they check fine. All coils seem firm. So-239 firm.
Any suggestions?
