onkyo ht-r990

[Khron]

Re: onkyo ht-r990

Oh, good, so it's as i first suspected - just making sure Usually voltage readings are taken with respect to (at least) the circuit ground, that's why we "need" the + and -.

Have you checked for DC on the amplifier outputs, as indicated in post #8?

[harleyman58]

Re: onkyo ht-r990

ok there is a place on top of the board where I can check the prot. if I ground the black to chassis and the red to vprot I get 137 mv,red to iprot 138,red to volh -1.9. there is a point called hpground black to it red to vprot 134 mv, red to iprot 134 red to volh -4.9 .

[harleyman58]

Re: onkyo ht-r990

there are also these points to check, sprlz2,sprlcs,sbz2m,amu,sec1h,sec1 off.

[harleyman58]

Re: onkyo ht-r990

isn't all this controlled on page 8 by q701? there is no output on jl600a on any pins.

[Khron]

Re: onkyo ht-r990

What exactly does "no output on JL600A pins" mean?

Let's take this another way - what audio sources do you have available for testing, apart from HDMI?

[harleyman58]

Re: onkyo ht-r990

well the radio doesn't work, the headphones don't work , what do you want me to check?
you ask me to check the output signal on jl600a/b on post #8, I don't get any mv reading from c to ground and the same for l,r,sl,sr,sbl,sbr.

[Khron]

Re: onkyo ht-r990

Sources, as in INPUTS; headphones are outputs.

Nothing at all, you say? That's a bit odd, i'd expect at least SOME mV to be present - it's a bit unlikely all the amps are THAT perfectly DC-balanced...

Could you check the voltages, referenced to pin 3 of each amp chip, on each of the RE pins? Ie. pins 4-5-6-7 on Q6002/6003, and pins 4-5-6-7 and 17-18 on Q6001

[harleyman58]

Re: onkyo ht-r990

ok 6001 with the black on pin 3, red on pin 4 =3.2mv, pin 5= -4.1mv,pin 6= -0.9, pin 7= 6.2 mv.,pin 17= 2.0 mv, pin 18= -5.3 mv.

ok 6002 with the black on pin 3, red on pin 4=2.6 mv, pin 5= -6.5 mv,pin 6= -8.9 mv,pin 7= 0.8 mv.

ok 6003 with the black on pin 3, red on pin 4=4.5 mv, pin 5= -4.0, pin 6= -8.8 mv, pin 7= 0.3 mv.