Yes i have looked for DC, and there isnt any.
Also there are 4 different relays, Front-Rear L&R None of them are
kicking in.


The fact that none of the relays is dropping in, is neither here nor
there - except to indicate that the problem is likely *not* related
to any particular relay driver. To avoid unncessary duplication, the
fault monitoring and switch on delay circuitry, will be a single
entity, monitoring all channels simultaneously, and acting on all
relay drivers simultaneously. Thus, any fault ( DC offset, over
current, over temp etc ) detected on *any* channel, will cause *all*
relay drivers to be inhibited. So, I would suggest that your problem
lies either with the fault monitoring circuitry itself, or the fact
that it is genuinely detecting a problem on one or more channels.

Arfa

Good point Afra

I think I've seen a couple bad 1 ohm resistors in the power supply cause
this. They're at the rear corner of the machine.

Mark Z.

Thanks mark.. Anything more specific on this 1 ohm resistor? location # perhaps?

i saw a few other posts of people complaning of the same problem, with no reply's of course, in other fourms on the web.
Ive put my Voltmeter on the outputs at the relay, i get 0.01 volts DC not enough to trip any protection circuit's.
thats why im seeking answers more like what mark has posted.
Known problems that ocassionally rear thier head.

I dont have the sony database of tips anymore cause I no longer subscribe, (i just dont do repairs like i used to)
but perhaps there is a sony bulliten on this issue?

I think I've seen a couple bad 1 ohm resistors in the power supply
cause
this. They're at the rear corner of the machine.

Mark Z.


R804, R805 in the rear corner pf the machine, the side where the power cord
comes in, as I recall. The board is called the "DC" board.

You may mail me directly at:



and reverse the domain name.


Mark Z.