petehall347
the brandy coffee man
it doesn't appear to be getting power to pin 1. there should be around 30v dc according to the data sheet .
without a schematic its not too easy to suggest where to look next ..its maybe a power supply fail .
lets start at the beginning of the supply .
check acv at both fuses .
check dcv at the bridge rectifier .
i think these will be correct as they will be feeding the main amp .
next check voltages at the op amps . jrc 2114d .
data sheet here for 2114d http://html.alldatasheet.com/html-pdf/7259/NJRC/NJM2114D/67/1/NJM2114D.html
i see 2 diodes under the bridge rectifier and am thinking that will be a rectifier for one of the power supplies . check them . one side of each is going to be acv the other dcv .
without a schematic its not too easy to suggest where to look next ..its maybe a power supply fail .
lets start at the beginning of the supply .
check acv at both fuses .
check dcv at the bridge rectifier .
i think these will be correct as they will be feeding the main amp .
next check voltages at the op amps . jrc 2114d .
data sheet here for 2114d http://html.alldatasheet.com/html-pdf/7259/NJRC/NJM2114D/67/1/NJM2114D.html
i see 2 diodes under the bridge rectifier and am thinking that will be a rectifier for one of the power supplies . check them . one side of each is going to be acv the other dcv .
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