Circuit diagrams and service manual for Rotel RTC-850? - diyAudio
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Old 2nd August 2006, 04:09 PM   #1
GJF is offline GJF  United Kingdom
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Default Circuit diagrams and service manual for Rotel RTC-850?

I've been sold a dud and wonder if anyone has the manuals/circuit diagrams for this that they would be willing to copy to me?

Unit powers on but will not select inputs. When holding the tuner selection button in continuously the display lights and it will tune but all else appears dead.

Any help appreciated.

Gary.
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Old 4th August 2006, 01:20 PM   #2
docfin is offline docfin  Europe
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Location: under the bridge
Check power supply of amp section, probably you have blowned fuses.
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Old 5th August 2006, 10:15 AM   #3
GJF is offline GJF  United Kingdom
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Problem solved.

3 pence resitor in the power supply feeding a zener gone o/c.
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Old 2nd September 2016, 09:30 PM   #4
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This is an old post, but seem to have exactly the same problem today... any chance anyone would know which resistor fixed this issue?
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Old 2nd September 2016, 09:56 PM   #5
kct is offline kct  Canada
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Have a look here.

ROTEL RTC-850-850L SM Service Manual free download, schematics, eeprom, repair info for electronics
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Old 2nd September 2016, 10:17 PM   #6
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Thanks for the quick reply! I grabbed the manual, but none of the resistors seem burnt. Was hoping for some guidance on which resistor the original poster swapped out.
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Old 2nd September 2016, 10:53 PM   #7
kct is offline kct  Canada
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NP, well may be it is not a failed resistor this time.

Measure the PS voltages to zero into the area of trouble or PM the original poster, may be he remembers what he did.
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