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Equipment Repairs => DVD/VIDEO/Home Cinemas/Hi-Fi/Mp3/Camcorder => Topic started by: Turnip on January 27, 2016,07:03:39

Title: Technics SU-Z55 Amplifier - No output.
Post by: Turnip on January 27, 2016,07:03:39

Hi Folks,

Got one in where display works but no sound output on either channel with supply voltages to the STK2038 seeming normal and nothing fused or burned out. Note there's a protection chip AN7072 but can't quite see what it does.
Wonder if it's a common problem ? - Attach schematic - Chris

Title: Re: Technics SU-Z55 Amplifier - No output.
Post by: jordan on January 27, 2016,11:02:49

Replace STK2038

Title: Re: Technics SU-Z55 Amplifier - No output.
Post by: Turnip on January 27, 2016,12:03:45

Hi Jordan, and many thanks,

Was surprised as both channels were duff, but guess protection chip AN7072 has sorted it, somehow.

Note that although schematic is available, the actual service manual now costs, and Panasonic don't seem care to support - Chris.

Title: Re: Technics SU-Z55 Amplifier - No output.
Post by: jordan on January 27, 2016,17:30:55

SU-Z55 Amplifier

Title: Re: Technics SU-Z55 Amplifier - No output.
Post by: Turnip on January 28, 2016,12:21:32

Hi Jordan, and thanks,

Think my schematic better than yours.

Note the entire service manual is unobtainable without much cash spent.

STK2038 now expensive - £20 a pop at the cheapest.

Think have words with customer, gather it was his Dad's, and he's just dug it out of the loft.

Thanks again - Chris.