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Sansui G-7500 Tuning Meter Fix?

gregmcm

gregmcm

Active Member
Picked up a new project - Sansui G-7500. Been sitting for some time and the usual dust, dirt ..... good news is that everything works with the exception of the tuning meter which sits in the middle of the meter and doesn't move. I'm wondering if anyone else has encountered this problem on a G-7500 or like model and if so is there a specific component that is causing the problem. I have the schematics and a couple of test meters. Thanks in advance.
 
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Connect your meter to the terminals (Polarity does not matter for DMM's with auto range), set to mV's. Tune through the stations and watch the meter for +- voltage as you tune to a good station. It should move +- v's and end up at zero volts when tuned - minus one side of the station and plus on the other. You'll see what I'm trying to get at.
Note:
Ohm out the meter when disconnected from the tuner. It should read 650 ohms or so. If it's open - it's broke.
Note:
The center tune meter has offsetting springs that keep the pointer centered. If the pointer sits off to the side, one spring is probably broken.

The signal strength meter is similar in operation and shares the same values. It starts at zero mV's and increases as the tuned signal strength increases.
 
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Looks like the problem was associated with the input selector. I had deoxit it but decided to do it again and give the selector switch a good workout. Once I did this the meter worked as it should. As has been heard many many times before a good cleaning of all switches is the first step in getting these old receivers working well.
 
gregmcm said:
Looks like the problem was associated with the input selector. I had deoxit it but decided to do it again and give the selector switch a good workout. Once I did this the meter worked as it should. As has been heard many many times before a good cleaning of all switches is the first step in getting these old receivers working well.
Click to expand...

Definitely bears repeating ;)
 
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