joaokmo
New Member
Hello folks! I bought a Pioneer SX-939 from a seller who initially claimed that the unit was working in good condition. Then the unit worked well in the first few days, but soon thereafter presented a crackling sound on the loudspeakers (see video attachment). So I thought that one of the amplification phases of the sine wave could be compromised, as I do not have an oscilloscope, I was not able to verify it. Then I went straight to the replacement of the drivers of the section of power amplifier, being the pairs of transistors: B536 to A940 and D381 to C2073.
After the replacement, the output sound was at a very low volume! After turning off the unit and on hours later, it did not even have any output at all.
PS: I've noticed that there is no relay click after all... (i suppose that there is no power going on through the power amp board?)
Hope someone with their expertise could help me to fix it, i would be very grateful. =]
After the replacement, the output sound was at a very low volume! After turning off the unit and on hours later, it did not even have any output at all.
PS: I've noticed that there is no relay click after all... (i suppose that there is no power going on through the power amp board?)
Hope someone with their expertise could help me to fix it, i would be very grateful. =]
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