Question about Pioneer Audio Players & Recorders
Pioneer stereo amplifier model SA 6800 ii
Posted by Anonymous on
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Posted on Jan 02, 2017
for audio system always you have left and right channels.
get the output (left&right) from tuner---go to equalizer input left&right.---from equalizer output go to amplifier inputs.and certainly from amplifier output to speaker.
Posted on Mar 11, 2008
SOURCE: pioneer amph sa 9500 II
Your amp is fitted with two 2SD588A (NPN) and two 2SB618A (PNP) power transistors in the output stages. Click on the part for a place to get them from. These parts are no longer available from Pioneer, nor are the prescribed replacements. (the amp was built in 1978) Because of the unusual transistor package used, you may have to upgrade to a more modern transistor, and modify the mounting also.
Posted on May 28, 2008
SOURCE: i need help
Loose connection on "POWER-SUPPLY" and sometimes solder loose on "C I S BOARD" due to extreme - heat of amplifier. $137.51 repair done in 1HR as I waited at CENTURY SOUND ELECTRONICS.
Posted on Feb 01, 2010
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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
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