TM848 repair?

Jim Brain brain at
Mon Jul 13 16:05:23 CDT 2020

On 7/13/2020 2:11 PM, Chuck Guzis via cctalk wrote:
> On 7/13/20 12:00 PM, Mike Stein via cctalk wrote:
>> Shouldn't be too difficult to troubleshoot; have you got the manual?
>> Start by checking the 24V > 12V regulator...
> Second that!  I've had to replace more than one regulator on 848s; also
> the 100 ohm resistor (R1) and electrolytic capacitor(C6) on the input
> side of the regulator.
> --Chuck

Thanks for the tip.  On one, the 10ohm (yep, 10) is cooked, so I need to 
get another one.  Looks like 1/2W, but anyone know for sure?  The 
schematic just notes the resistance and identifier.  It could be 1W...

The other 1 I have on the bench looks to have a good resistor, but I 
will check the VR next.


Jim Brain
brain at

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