OOH! OOH! There could also be a bad muting transistor associated with one
of these chips or functions.

Mark Z.


"Mark D. Zacharias" wrote in message news:...

Recently I had to move it around a little snip
I get all the connections back to what they were and everything works
fine except.... whenever I select the optical digital stream for say,
my DVD player or digital cable box, the receiver shuts off by itself
right as I switch the input source.

However, whenever I select another type of digital signal process
effect, like "rock concert" or "concert hall" I can use the DVD player
or digital cable box fine. "

Does this mean that only that one or two inputs are affected, or that when
you turned the receiver back on it functioned normally on those inputs?

From this I assume that the Dolby Digital decoder inside the receiver
has gone bad. I checked the speaker setting on the back as well, and
it's set properly for my speakers.
"thatLADude" wrote in message
. ..

The Yamaha has some rather sophisticated diagnostic software, intended for
repair technicians. I hesitate to give out this info, but the worst that
could probably happen is that you would have to re-enter all your user
settings if you re-initialize the unit.
It is possible to cancel the protection function during the test, (deeper
into the menus) so in rare cases an amp channel could fail if the problem
were a bad bias transistor, etc.

Just to check the protection history, press and hold "FM-AM" and "Input
Mode" simultaneously, then press the "Standby/On key.

The display should either say NO PROTECT (unlikely), PS and a percent
value(unlikely), I Protect (possible) or DC (more likely) and give a
percent.

At this point press the Standby/On switch again to cancel test mode.

My guess is that for some reason there is a DC shift at the moment you
first switch to that source. Could be a bad decoder IC or switch IC.


Mark Z.

Mark:

I ran the diagonostic check you gave me and this is the reading on the
front of the receiver:

"I PROTECT" -- then:

"1 DVD/LD BYPAS"

Know what that means or what the problem might be?

Thanks for any advice/input you can share!

Mark D. Zacharias wrote:
OOH! OOH! There could also be a bad muting transistor associated
with one
of these chips or functions.

Mark Z.


"Mark D. Zacharias" wrote in message news:...

Recently I had to move it around a little snip
I get all the connections back to what they were and everything
works
fine except.... whenever I select the optical digital stream for
say,
my DVD player or digital cable box, the receiver shuts off by
itself
right as I switch the input source.

However, whenever I select another type of digital signal process
effect, like "rock concert" or "concert hall" I can use the DVD
player
or digital cable box fine. "

Does this mean that only that one or two inputs are affected, or
that when
you turned the receiver back on it functioned normally on those
inputs?

From this I assume that the Dolby Digital decoder inside the
receiver
has gone bad. I checked the speaker setting on the back as well,
and
it's set properly for my speakers.
"thatLADude" wrote in message
. ..

The Yamaha has some rather sophisticated diagnostic software,
intended for
repair technicians. I hesitate to give out this info, but the worst
that
could probably happen is that you would have to re-enter all your
user
settings if you re-initialize the unit.
It is possible to cancel the protection function during the test,
(deeper
into the menus) so in rare cases an amp channel could fail if the
problem
were a bad bias transistor, etc.

Just to check the protection history, press and hold "FM-AM" and
"Input
Mode" simultaneously, then press the "Standby/On key.

The display should either say NO PROTECT (unlikely), PS and a
percent
value(unlikely), I Protect (possible) or DC (more likely) and give
a
percent.

At this point press the Standby/On switch again to cancel test
mode.

My guess is that for some reason there is a DC shift at the moment
you
first switch to that source. Could be a bad decoder IC or switch
IC.


Mark Z.

The I protect mens that the diagnostics have picked up an anomaly- probably
due to a loud pop being sent through one/more channels at the time the fault
occurs. Do you hear this pop/bang? just as the unit clicks off?
The 1 DVD ...bypass is just the next step of the diagnostic mode.
As for whats causing the fault, thats very difficult even for us to find
with the machine on the test bench but 5V regulators feeding the DSP section
is probably the best place to start checking..
AW


"thatLADude" wrote in message
oups.com...
Mark:

I ran the diagonostic check you gave me and this is the reading on the
front of the receiver:

"I PROTECT" -- then:

"1 DVD/LD BYPAS"

Know what that means or what the problem might be?

Thanks for any advice/input you can share!

Mark D. Zacharias wrote:
OOH! OOH! There could also be a bad muting transistor associated
with one
of these chips or functions.

Mark Z.


"Mark D. Zacharias" wrote in message news:...

Recently I had to move it around a little snip
I get all the connections back to what they were and everything
works
fine except.... whenever I select the optical digital stream for
say,
my DVD player or digital cable box, the receiver shuts off by
itself
right as I switch the input source.

However, whenever I select another type of digital signal process
effect, like "rock concert" or "concert hall" I can use the DVD
player
or digital cable box fine. "

Does this mean that only that one or two inputs are affected, or
that when
you turned the receiver back on it functioned normally on those
inputs?

From this I assume that the Dolby Digital decoder inside the
receiver
has gone bad. I checked the speaker setting on the back as well,
and
it's set properly for my speakers.
"thatLADude" wrote in message
. ..

The Yamaha has some rather sophisticated diagnostic software,
intended for
repair technicians. I hesitate to give out this info, but the worst
that
could probably happen is that you would have to re-enter all your
user
settings if you re-initialize the unit.
It is possible to cancel the protection function during the test,
(deeper
into the menus) so in rare cases an amp channel could fail if the
problem
were a bad bias transistor, etc.

Just to check the protection history, press and hold "FM-AM" and
"Input
Mode" simultaneously, then press the "Standby/On key.

The display should either say NO PROTECT (unlikely), PS and a
percent
value(unlikely), I Protect (possible) or DC (more likely) and give
a
percent.

At this point press the Standby/On switch again to cancel test
mode.

My guess is that for some reason there is a DC shift at the moment
you
first switch to that source. Could be a bad decoder IC or switch
IC.


Mark Z.

That's an over-current fault code. A shorted speaker wire is the most likely
cause. Maybe a loose strand.

Mark Z.


"thatLADude" wrote in message
oups.com...
Mark:

I ran the diagonostic check you gave me and this is the reading on the
front of the receiver:

"I PROTECT" -- then:

"1 DVD/LD BYPAS"

Know what that means or what the problem might be?

Thanks for any advice/input you can share!

Mark D. Zacharias wrote:
OOH! OOH! There could also be a bad muting transistor associated
with one
of these chips or functions.

Mark Z.


"Mark D. Zacharias" wrote in message news:...

Recently I had to move it around a little snip
I get all the connections back to what they were and everything
works
fine except.... whenever I select the optical digital stream for
say,
my DVD player or digital cable box, the receiver shuts off by
itself
right as I switch the input source.

However, whenever I select another type of digital signal process
effect, like "rock concert" or "concert hall" I can use the DVD
player
or digital cable box fine. "

Does this mean that only that one or two inputs are affected, or
that when
you turned the receiver back on it functioned normally on those
inputs?

From this I assume that the Dolby Digital decoder inside the
receiver
has gone bad. I checked the speaker setting on the back as well,
and
it's set properly for my speakers.
"thatLADude" wrote in message
. ..

The Yamaha has some rather sophisticated diagnostic software,
intended for
repair technicians. I hesitate to give out this info, but the worst
that
could probably happen is that you would have to re-enter all your
user
settings if you re-initialize the unit.
It is possible to cancel the protection function during the test,
(deeper
into the menus) so in rare cases an amp channel could fail if the
problem
were a bad bias transistor, etc.

Just to check the protection history, press and hold "FM-AM" and
"Input
Mode" simultaneously, then press the "Standby/On key.

The display should either say NO PROTECT (unlikely), PS and a
percent
value(unlikely), I Protect (possible) or DC (more likely) and give
a
percent.

At this point press the Standby/On switch again to cancel test
mode.

My guess is that for some reason there is a DC shift at the moment
you
first switch to that source. Could be a bad decoder IC or switch
IC.


Mark Z.

Mark:

Thanks so much for your help -- I guess it might be time for new
speaker wire -- I'm using Monster cable, but the ends are somewhat
frayed from over-twisting over the years to get into the connectors on
the back of the unit and the speakers.

-Brendon


Mark D. Zacharias wrote:
That's an over-current fault code. A shorted speaker wire is the most
likely
cause. Maybe a loose strand.

Mark Z.

Speaker wires frayed and / or touching together is the number one cause of
amplifier failures.

Mark Z.


"thatLADude" wrote in message
oups.com...
Mark:

Thanks so much for your help -- I guess it might be time for new
speaker wire -- I'm using Monster cable, but the ends are somewhat
frayed from over-twisting over the years to get into the connectors on
the back of the unit and the speakers.

-Brendon


Mark D. Zacharias wrote:
That's an over-current fault code. A shorted speaker wire is the most
likely
cause. Maybe a loose strand.

Mark Z.

Mark:

So after a small investment in new speaker wires, the unit no longer
powers off by itself!
The speaker wires were older than the receiver -- does oxidation also
occur on the copper of the speaker wires? Can that also cause problems?
Thanks again for your help!

Cheers,
-Brendon

I don't think oxidation is that much of an issue here, but I'm all in favor
of good-condition wires.
Glad that seems to have worked out - I was bound to be right eventually!

:-)


Mark Z.
"thatLADude" wrote in message
ups.com...
Mark:

So after a small investment in new speaker wires, the unit no longer
powers off by itself!
The speaker wires were older than the receiver -- does oxidation also
occur on the copper of the speaker wires? Can that also cause problems?
Thanks again for your help!

Cheers,
-Brendon