I have a Yamaha RX-596 stereo receiver, which has small ?servo motors
that enable remote control of both the volume control and the source
input (phono, cd, tape, etc) selector switch knob. The ?servo motor or
its
circuitry which moves the source selector knob seems to have a
problem: it often bypasses the chosen position, or it shimmys and
never settles to its correct position. When I operate the knob by hand
(rather than with the remote) I can put it in its correct place but
sometimes the LED display showing CD of FM or Phono will lag or
flicker.

It seems to me that there is some bad connection somewhere, or an
offset between the servo control postition and the rotary contacts.
The switch and its motor circuitry are fairly easy to get at inside
the receiver
cabinet, so I am considering at least pulling the cabinet off and
having a look and possibly reparing it mysefl - if this is at all
possible?

Any ideas on experiences with a similar problem and what it might be
would be greatly appreciated.

Thanks!

Larry Gagnon

lagagnon wrote in message
...
I have a Yamaha RX-596 stereo receiver, which has small ?servo motors
that enable remote control of both the volume control and the source
input (phono, cd, tape, etc) selector switch knob. The ?servo motor or
its
circuitry which moves the source selector knob seems to have a
problem: it often bypasses the chosen position, or it shimmys and
never settles to its correct position. When I operate the knob by hand
(rather than with the remote) I can put it in its correct place but
sometimes the LED display showing CD of FM or Phono will lag or
flicker.

It seems to me that there is some bad connection somewhere, or an
offset between the servo control postition and the rotary contacts.
The switch and its motor circuitry are fairly easy to get at inside
the receiver
cabinet, so I am considering at least pulling the cabinet off and
having a look and possibly reparing it mysefl - if this is at all
possible?

Any ideas on experiences with a similar problem and what it might be
would be greatly appreciated.

Thanks!

Larry Gagnon

If its like the Arcam delta 290 and 290P on my file
http://www.divdev.fsnet.co.uk/repair5.htm
best of luck

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

"N_Cook" wrote in message
...
lagagnon wrote in message
...
I have a Yamaha RX-596 stereo receiver, which has small ?servo motors
that enable remote control of both the volume control and the source
input (phono, cd, tape, etc) selector switch knob. The ?servo motor or
its
circuitry which moves the source selector knob seems to have a
problem: it often bypasses the chosen position, or it shimmys and
never settles to its correct position. When I operate the knob by hand
(rather than with the remote) I can put it in its correct place but
sometimes the LED display showing CD of FM or Phono will lag or
flicker.

It seems to me that there is some bad connection somewhere, or an
offset between the servo control postition and the rotary contacts.
The switch and its motor circuitry are fairly easy to get at inside
the receiver
cabinet, so I am considering at least pulling the cabinet off and
having a look and possibly reparing it mysefl - if this is at all
possible?

Any ideas on experiences with a similar problem and what it might be
would be greatly appreciated.

Thanks!

Larry Gagnon


I cant help you here except to say I have the same issue with my unit.
It rarely does it though but still annoys the crap out of me.

Mark

"lagagnon" wrote in message
...
I have a Yamaha RX-596 stereo receiver, which has small ?servo motors
that enable remote control of both the volume control and the source
input (phono, cd, tape, etc) selector switch knob. The ?servo motor or
its
circuitry which moves the source selector knob seems to have a
problem: it often bypasses the chosen position, or it shimmys and
never settles to its correct position. When I operate the knob by hand
(rather than with the remote) I can put it in its correct place but
sometimes the LED display showing CD of FM or Phono will lag or
flicker.

It seems to me that there is some bad connection somewhere, or an
offset between the servo control postition and the rotary contacts.
The switch and its motor circuitry are fairly easy to get at inside
the receiver
cabinet, so I am considering at least pulling the cabinet off and
having a look and possibly reparing it mysefl - if this is at all
possible?

Any ideas on experiences with a similar problem and what it might be
would be greatly appreciated.

**Standard problem with this model and it's derivatives. Yamaha, like many
companies, cut corners in places they shouldn't have. Instead if using gold
plated contacts on the selector switch, they used a cheaper material. It
oxidises and the switch is buggered. Replace it. Yamaha have seen the error
of their ways and the replacement (Yamaha OEM) part will be gold plated
(barely) and will last longer. Cleaning the switch, IME, is not a workable
solution. I've fixed dozens of the things.


--
Trevor Wilson
www.rageaudio.com.au

"Trevor Wilson" wrote in message
...



"lagagnon" wrote in message
...
I have a Yamaha RX-596 stereo receiver, which has small ?servo motors
that enable remote control of both the volume control and the source
input (phono, cd, tape, etc) selector switch knob. The ?servo motor or
its
circuitry which moves the source selector knob seems to have a
problem: it often bypasses the chosen position, or it shimmys and
never settles to its correct position. When I operate the knob by hand
(rather than with the remote) I can put it in its correct place but
sometimes the LED display showing CD of FM or Phono will lag or
flicker.

It seems to me that there is some bad connection somewhere, or an
offset between the servo control postition and the rotary contacts.
The switch and its motor circuitry are fairly easy to get at inside
the receiver
cabinet, so I am considering at least pulling the cabinet off and
having a look and possibly reparing it mysefl - if this is at all
possible?

Any ideas on experiences with a similar problem and what it might be
would be greatly appreciated.

**Standard problem with this model and it's derivatives. Yamaha, like many
companies, cut corners in places they shouldn't have. Instead if using
gold plated contacts on the selector switch, they used a cheaper material.
It oxidises and the switch is buggered. Replace it. Yamaha have seen the
error of their ways and the replacement (Yamaha OEM) part will be gold
plated (barely) and will last longer. Cleaning the switch, IME, is not a
workable solution. I've fixed dozens of the things.


--
Trevor Wilson
www.rageaudio.com.au


Except that the improved replacement switch may well not be available
anymore. I have run into this obstacle personally. A skilled tech can remove
and service the switch, but it's a really tricky procedure. It is difficult
to remove, and the switch itself is constructed like several VCR mode
switches in a larger housing complete with the motor ass'y. One slip or
incorrect re-assembly, and you're hosed.

Mark Z.