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Matt_1126
New member
Username: Matt_1126
Post Number: 4
Registered: 6-2006
| | Posted on Tuesday, July 04, 2006 - 3:32 am: | 
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there is a diode i think D94 is un soldered from the board beside TR53 i dont know if that would have anything to do with it or not and i need to know what the thermal diode that is on the little board which is on the finals and driver
thanks if anyone can help |
Therealporkchop
Advanced Member
Username: Therealporkchop
Post Number: 848
Registered: 11-2002
| | Posted on Tuesday, July 04, 2006 - 6:43 pm: |
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I am not sure about the thermal diode on the finals, but I believe it's there to cut back voltage in the event they get too hot. So you can remove them if you want to, I did and only left the one on the driver.
I'd solder D94 back together. Off the top of my head I have no idea what it's for, and surely without looking at a schematic for that radio.
If your radio is showing key-up with the transmit/receive light showing transmit on key, then I'd first the check driver & finals. If you get a key-up with a carrier and no modulation, then I'd check the large transistor located next to the power plug. The 2SB754 piece, could be a 2SB817 piece if ever changed or upgraded or if they newer radios are coming with these in place of the 754. Also directly across from it is another piece, a 2SA1012 I believe is the number. I'd check it as well. There is a capacitor in that area as well, can't recall the number off the top of my head, but it's a 100uF16v piece. Might wanna check that if you have low modulation swing.
Off the top of my head, that's all I can suggest. I'm sure others will chime in, either way we'll help ya get it fixed sooner or later. |
Matt_1126
New member
Username: Matt_1126
Post Number: 5
Registered: 6-2006
| | Posted on Thursday, July 06, 2006 - 3:43 pm: |
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the diode that i sald was d 92 instead of d 94 so if that helps thank you |
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