Another Yamaha

[No1baggiesfan]

Re: Another Yamaha

Update again.
Amp still working, yay
Now I need to fix the on/off button on the remote, :/

[No1baggiesfan]

Re: Another Yamaha

Update.
Looks like she's back to her old self again, everything is working as it should, watched a couple of movies, no issues, does seem to be a tad warmer than I remember, maybe it's just me being paranoid lol.

Anyway, want to say thank you again to R_J for his time and help and everyone else who also joined in.

[No1baggiesfan]

Re: Another Yamaha

It does, but it it hadn't lit since last week

[R_J]

Re: Another Yamaha

Thats likely how it works, standby led lit in standby, turns off when amp is on.

[No1baggiesfan]

Re: Another Yamaha

Firmware is already 1.80
Just turned the amp off, red standby light is now on lol ??

[R_J]

Re: Another Yamaha

Try doing a full reset, if that does'nt help check the firmware version, I see there is a firmware update to ver. 1.80

[No1baggiesfan]

Re: Another Yamaha

I'll test that tomorrow, but for now it seems to be ok, it's working at least.
One other issue I noticed is that when I press 'sur decode' it goes into 'straight' mode when it should go into 'neo' mode

[R_J]

Re: Another Yamaha

The standby led supply voltage is the +3.3M It can be tested on operation board plug CB473 (page 136) There is also the control line from the main microprocessor ic which is the pin next to it, it should change when the amp goes from operate to standby

[No1baggiesfan]

Re: Another Yamaha

It's not a 'protect' error, it's the reading from the hidden menu
Amp is hooked up and working so far though

[R_J]

Re: Another Yamaha

Ok, reset amp, powered up and it stayed on

so the amp stays on but the diagnostic still shows an error
p1-2
Ps 80/129
Did you do the S3 factory reset?

[No1baggiesfan]

Re: Another Yamaha

Still no stand by led ?
Ps now showing 80/129

[No1baggiesfan]

Re: Another Yamaha

I hadn't tried

Ok, reset amp, powered up and it stayed on

I guess now we reassemble it and hook up some speakers

[R_J]

Re: Another Yamaha

ok, so NOW you have -12 volts on its output. Does the amp now work?

[No1baggiesfan]

Re: Another Yamaha

Autocorrect on iPhone, sorry

[R_J]

Re: Another Yamaha

So you now have 7.8 volts on the ground terminal???? I have know idea what you are doing.

[No1baggiesfan]

Re: Another Yamaha

Dry joint on regulator :/
I now have -12v -18v 0v on regulator

-18v and -19.7v on resistor

[R_J]

Re: Another Yamaha

20.9v on both side of the resistor tells me you ripped the trace replacing the regulator.
R1238 is 10Ω Wher did you come up with .22Ω ????
Please look at the schematic the resistor connects DIRECTLY to the INPUT of the regulator.
If you have 20.9 volts on one side of a piece of wire and 0 on the other side, where would you look for the problem.

[No1baggiesfan]

Re: Another Yamaha

R1238 reading 9.9 ohms
20.9v on both sides

Shouldn't it be 0.22ohm ?

[R_J]

Re: Another Yamaha

If you only get .6v on the input, R1238 must have gone open. It could be due to excessive load on the -12 volt line.

[No1baggiesfan]

Re: Another Yamaha

0.6v on input
0.9 across c1088
All plastic L7912cp

Old and new in picture