SOURCE: Need to change FM frequency steps on Yamaha RX-495 Receiver
I don't know how to change the tuning step from .2 Mhz to .1 Mhz, but whatever you do - don't adjust those tunable slugs! If you are told to - I would be very suspect of any procedure that says you must. Those types of coils are adjusted by a threaded iron core that when turned by the slot on top, either raise up from or slide down into the coil. Furthermore, use of a metal screwdriver is a big no-no to make those adjustments. Specially made fiberglass tweaker tools are used to adjust or tune these iron slugs, and often require special equipment (o-scope, DMM, etc) or other specific detailed procedure for proper setup. Fiberglass is used as it does not interact with the iron slug like a metal screwdriver would (appearing as more metal) by affecting the magnetic field of the coil. It has nothing to due with electric shock protection. Good luck!
SOURCE: FM Tuner not receiving - Yamaha R7 receiver
Take the cover off and look at the cable that connects the tuner to the main board. Make sure it is connected straight and tight. Make sure all screws in the back are tight, just in case it is a grounding issue. Iff all checks out and you still have issues, replace your tuner.
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Chapter 6:
Using the tuner
Listening to the radio
The following steps show you how to tune in to FM and
AM radio broadcasts using the automatic (search) and
manual (step) tuning functions. If you already know the
frequency of the station you want, see Tuning directly to a
station below. Once you are tuned to a station you can
memorize the frequency for recall later-see Saving
station presets below for more on how to do this.
1 Press the FM/AM button to select the tuner.
2 Use the FM/AM button to change the band (FM or
AM), if necessary.
Each press switches the band between FM and AM.
3 Tune to a station.
There are three ways to do this:
Automatic tuning
To search for stations in the currently selected band,
press and hold TUNE ?©/?? for about a second. The
receiver will start searching for the next station,
stopping when it has found one. Repeat to search for
other stations.
Manual tuning
To change the frequency one step at a time, press
TUNE ?©/??.
High speed tuning
Press and hold TUNE ?©/?? for high speed tuning.
Release the button at the frequency you want.
Improving FM stereo sound
If the TUNED or STEREO indicators don't light when
tuning to an FM station because the signal is weak, press
the MPX button to switch the receiver into mono
reception mode. This should improve the sound quality
and allow you to enjoy the broadcast.
Using Neural THX
This feature uses Neural Surround™, THX® technology to
achieve optimal surround sound from FM radio.
• While listening to FM radio, press AUTO/DIRECT for
Neural THX listening.
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