Marantz PM-75 maintenance and PM-80 similar to the fame of the latter seems to be larger, early pure music with Marantz amplifier, with its accessible price and excellent quality by the audiophile favorite, though, is more than 10 years old, and many fancier still could not bear to throw it away.8KLservice manual download site
Open the cover to smell a burning smell, right of zooming in on the pipe had burst, and the model is 2SK1058/2SJ162, when customers send the machine to know that the pipe burned, he worries that we have original pipes had given him, when he knows we all come from Shantou, the country's largest demolition machine components market, when he relieved,8KLservice manual download site
8KLservice manual download site
Knowledgeable people know second-hand original Split airport better than the new pipe. This is pair field effect tube, measurement left channel on tube no damaged, loaded Shang pair original split machine zoom tube, replaced Qian a level of promoted tube and related resistance Hou power try machine, amplifier can power, but output following electrical not sucking collection, measurement around channel output zero points voltage no exception, access signal Shi measurement output signal waveform normal, will speaker directly received following electrical Shang, voice completely normal, description fault also in protection circuit or following electrical work circuit Shang, measurement TA7317P each feet voltage normal8KLservice manual download site
8KLservice manual download site
, Description is not caused by the operation of circuit protection, then the fault is obviously simple, the 24V power supply and relay driver transistor is OK, measured parallel to the diode on the relay coil short circuit, there are traces of corrosion, replace the system and subsequent electrical snap about five seconds, the output sound normal.8KLservice manual download site
Yu-audio professional audio repair for many years, music amplifiers for HIFI level maintenance has accumulated a wealth of technology experience, for the majority of users to restore a soundtrack of original amplifier,8KLservice manual download site