Raccoon1400
Super Member
what/where are the driver transistors?
Replaced output transistors, anything to do before I power it on?
- Thread starter Raccoon1400
- Start date
Appear to be Q25 - Q28
Q25/26 --2SA850
Q27/28---2SC1735
q27-28 =2sc1735 npn to-92 100v 0.5a 0.8w 50-300hfe 130mhz
512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17
q25-26 =2sa850 pnp to-92 100v 0.5a 0.8w 50-300hfe 130mhz
512-KSA1013YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17 (R=60-120, O=100/200, Y=160/320)
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Q25/26 --2SA850
Q27/28---2SC1735
q27-28 =2sc1735 npn to-92 100v 0.5a 0.8w 50-300hfe 130mhz
512-KSC2383YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17
q25-26 =2sa850 pnp to-92 100v 0.5a 0.8w 50-300hfe 130mhz
512-KSA1013YBU to-92L ecb 160v 1a .9w 50mhz 160-320hfe $0.17 (R=60-120, O=100/200, Y=160/320)
__________________
Raccoon1400
Super Member
I found a resistor next to the fuse that blew that seems fried. It registered infinity when I put the ohmmeter across it. When I pulled it out, it wouldn't give a consistent reading.
Raccoon1400
Super Member
After deslodering and testing many components, I found that the equivalent of the mica insulator I got was actually a conductor. After replacing it with the correct part, the unit worked, only to overheat a few minutes later. There's now one dead output. The two that overheated were the replacements for the ones that blew originally.
Any suggestions?
Any suggestions?