Derek92994's 700 Ser II White Oak conversion

[laatsch55]

You go to 240 right?

 

[derek92994]

Dc offset 0.01 both channels at 142volt ac. Keep going?

 

[laatsch55]

Yep..

 

[laatsch55]

.01 on what scale?

 

[derek92994]

Relays clicked at about 180 and 190 volts ac. Went up to 230v

 

[derek92994]

0.01 on 2 volt scale

 

[laatsch55]

Ahhhh...check bias, set meter scale to millivolts..

 

[derek92994]

Millivolts dc or ac?

 

[laatsch55]

DC

 

[derek92994]

.360 left .367 right

 

[laatsch55]

Wonderful. Power down, let caps discharge, plug directly into wall, listen for relay clicks, let idle for 5 minutes, set bias to 375...

 

[laatsch55]

You are checkin bias between test point 2 (bias +) and test point 3 (out) correct?

 

[derek92994]

The meters peg for a split second on power up before relay clicks. This does not seem normal?

 

[derek92994]

I measured bias using positive in yellow bias L point and negative on black ground point. Same for right channel

 

[derek92994]

Ok some confusion, i did that all on control board, forgive my memory, could not remember bias checking procedure

 

[derek92994]

Will retest using correct points

 

[derek92994]

Bias checked and set to 375 using point 2 and 3 on backplanes

 

[laatsch55]

The meters peg for a split second on power up before relay clicks. This does not seem normal?

Yeah, that doesn't seem right..

 

[laatsch55]

Bias checked and set to 375 using point 2 and 3 on backplanes

Good, right where it should be!! Ya did it DARC!!!

 

[derek92994]

Found the problem!! Meter range was turned up