Pioneer Tuner F-Z93L troubleshooting

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Hi everybody

I have a pretty old Pioneer Tuner F-Z93L part of an entire stereo
device S111. The problem with the tuner is that it keeps searching on
the entire FM-band in order to find a station. It never stops.
I think it has something to do with the treshold level to distinguish
noise / signal.

In it, I descovered a PCB with number ANPI356-B. There's another PCB
near the front, carrying the LCD and some other stuff.

Has anyone advice upon this, similar problems in another tuner, a
schematic diagram would be perfect

Thanks for help

Eng. GDB

 

[Mark D. Zacharias]

Hi everybody

I have a pretty old Pioneer Tuner F-Z93L part of an entire stereo
device S111. The problem with the tuner is that it keeps searching on
the entire FM-band in order to find a station. It never stops.
I think it has something to do with the treshold level to distinguish
noise / signal.

In it, I descovered a PCB with number ANPI356-B. There's another PCB
near the front, carrying the LCD and some other stuff.

Has anyone advice upon this, similar problems in another tuner, a
schematic diagram would be perfect

Thanks for help

Eng. GDB

If you can manually tune a station, and it's just that the scan-stop doesn't
work, the discriminator needs adjustment. This is actually quite common on
digital tuners. This normally requires a service manual to locate the test
point and the adjustment coil(transformer, actually), and a voltmeter (or
the 'scope on a small DC range) to adjust for minimum DC at the test point,
when tuned to a station near 98mHz.
Also, the VCO may need adjustment if the stereo beacon lamp or LED does not
come on reliably.

Mark Z.

 

[Colin McCormick]

Hello

I've got a F-Z92L tuner, which may be compatible
with your system (connected via a short ribbon
cable and connector). Yours for the price of UK
postage or collect from Devon. Being quite
light I would expect it to cost £7.20 to post.

Contact me directly on [email protected] if
this is of use to you.

Regards,

Colin