Looking at a schematic, there is an R601 on the F2646 Tone board (The
one with the tone control pots) shown as a 220 ohm, 1/4 watt fuse
resistor. There is a 100K R601 shown on the F2648 board schematic, but
not the parts list, that I could find.

So, have a look at the manual and make sure you are looking at the
diagram for the correct board, as there are (at least) TWO R601's in
this unit. Or to quote a Canadian friend: "Clear as Mud, Eh?"

Regards,
Tim Schwartz
Bristol Electronics




On 11/29/2019 7:13 AM, wrote:
Its a Sansui 5050 receiver. The power amp works, the radio tuning meter
moves, so it seems that works. But the preamp board is dead. Not a
single transistor or any other component on that board has voltage.
There is 44vdc on a wire from the power supply. It goes to a resistor.
No voltage on other side of this resistor. Multimeter on ohm scale
confirms resistor is open.

The problem is that resistor is red red brown @ 5% (gold). Thats 220
ohms. Yet an online schematic shows R601 as 100K.

OK, I know that resistor is dead, but how can the actual color code be
so different from schematic? The resistor is not burnt, but may have
gotten warm. Yet the color code is plain to see, except the gold band is
kind of greenish.....

My plan is to clip in a resistor, but where do I start with such a
conflict of values....

Yes, I triple checked this is R601. Unless the schematic is labeled
wrong????

This appears to be the only voltage source to this board.....

Any ideas or suggestions?

Thanks