Onkyo TX-DS989 flagship AV amplifier for surround sound right channel in the early sound of sand, then into a silent machine protection. 2. the second in a five-way coaxial input no sound -Service Manual Download|Circuit Download|Download Drawings|schematic download|route map download|free download user manual

Your current location：Home > Technical Articles > Audio

Onkyo TX-DS989 flagship AV amplifier for surround sound right channel in the early sound of sand, then into a silent machine protection. 2. the second in a five-way coaxial input no sound

Time：2015-05-26 08:24:06 Source：Network Author：Unknown Clicks：1401

Maintenance: whole entering protection State and subsequent electrical sound boot screen where the shutdown goes into protection, back-level power supply disconnect amplifier can boot correctly, statement-level short circuit protection, will rip up the stage after a measurement, it is easy to find corrupted surround right channel bad amplifier tube, try one by one after the replacement machine back to normal.

Coaxial signal maintenance-free split coaxial decoding Board, connected to the coaxial signal, adjusted the oscilloscope, you can check without power. Able to track from the input hole five-way coaxial signal found that signal into both chip VHC U04, this chip is an acronym for TC74VHCU04, for double-row TOP package, a total of 14 feet. When you access signal on the second channel input interface, on-chip signals at one end were shorted no waveform display, explains chip damage. After replacing everything returned to normal.

Summary: this Adventist TX-DS989 amplifier structure is compact, when disassembling, be cautious if you don't know the first split which which part after loading, 989 users manual can be found, manual disassembly and the circuit diagram above, is helpful for maintenance. Inside the machine the wire and connector are more split when light plug light pull, taking power off the Dianyuan, so as not to accidentally expand the "fault" for the maintenance of the first rule is to not expand "failure". These views and articles from individuals, omissions or errors in the requested verification from friends.

2 Home Previous 1 2