UncleBingo
Super Member
Kenwood KR 6340 on the bench - part of the Two-Four series (Stereo/Quad).
This unit stays in protection. I have tested with each one of the two power amps separately, and both amps installed together- still stays in protect.
DC measured at the relay is 42mv on one side and 240mv on the other side.
Zero volts on the relay coil.
If I manually actuate the relay: Music!
I replaced Q1-Q6 on the board- but due to the silly icon Kenwood used when they silk-screened the transistor marks on the board, I'm not sure what signifies EBC...
I have gone to the schematic and sussed out proper leg orientation by back-checking against the original transistor leg orientation (Example: 2SA733 is ECB >KSA992 is ECB, so I put the new transistors in the same way). Q1 was replaced before I got the amp, so I'm flying a little blind on that one based on the silk-screened icon on the circuit board; No arrow, no clearly marked base... argh.
Can any of the resident Kenwood experts chime in on this one?
The other thing I noticed was a BUNCH of 2SC458 on the SQ decoder board (like 10 of them) I have every intention of replacing them, but I'd like to get the amp running (unless these are likely puking up the works...)
This unit stays in protection. I have tested with each one of the two power amps separately, and both amps installed together- still stays in protect.
DC measured at the relay is 42mv on one side and 240mv on the other side.
Zero volts on the relay coil.
If I manually actuate the relay: Music!
I replaced Q1-Q6 on the board- but due to the silly icon Kenwood used when they silk-screened the transistor marks on the board, I'm not sure what signifies EBC...
I have gone to the schematic and sussed out proper leg orientation by back-checking against the original transistor leg orientation (Example: 2SA733 is ECB >KSA992 is ECB, so I put the new transistors in the same way). Q1 was replaced before I got the amp, so I'm flying a little blind on that one based on the silk-screened icon on the circuit board; No arrow, no clearly marked base... argh.
Can any of the resident Kenwood experts chime in on this one?
The other thing I noticed was a BUNCH of 2SC458 on the SQ decoder board (like 10 of them) I have every intention of replacing them, but I'd like to get the amp running (unless these are likely puking up the works...)
