Friends sent to this of this Taiwan days Dragon old paragraph amplifier AV-R3530, does somewhat old, although is AV amplifier, only with two a channel of simulation surround plus a in the reset, not support with axis and fiber, is put this more than 10 years of amplifier took to maintenance repair, is because elderly feel yiqian buy have your, lost has won't, heard music of effect also compared recognized.xypservice manual download site
xypservice manual download site
After power on, caught a whiff of smoke, and quickly shut down, opened the lid and found that this machine is old, one advantage is that the farmer was a piece can be separately removed the bottom cover plate, as a maintenance window, done to maintenance personnel satisfaction. Observation-found that smoke from the right channel amplifier Board resistors, clear-channel the amplifier Electronics is broken. As surround amplifiers are mounted on top of the channel, is it is not easily be repaired. Right channel of the last stage was done by a pair of 2SB1560/2SD2390, burnt the 82 Ohm resistor on the tube side, measuring tube have short circuit, pushing pipe 2SC2073 and 2SA940 are short,xypservice manual download site
xypservice manual download site
Access repair power after replacing these parts, measuring the output zero-point voltage is 570MV, late-stage base voltage plus or minus 0.5 volt, no exceptions, access to sound without distortion. After you recover the original engine-powered machine is working properly. This Denon amplifier repair is complete.xypservice manual download site
Additional questions, a Netizen in Baidu for Denon amplifier repair questions are as follows:xypservice manual download site
xypservice manual download site
A @# native Denon amplifier, model PMA-980R, R549,R550 two resistors in the circuit board after burned, can't tell the color wheel, that master would like to know how old were these two resistors. There are two left and right channels on the tube, I see the circuit should be connected to the PNP and NPN base pins. Is transistor A1490 C3854, plate type "DENON 1U-2422-1 ^ YG-H3xypservice manual download site
Answer: If this part of the circuit is burned out one channel of the power amplifier,

 2    1 2 Next Last