Bottlehead Forum

Second Try

71.80.65.127

In Reply to: RE: foreplay III voltage check help posted by eric.saletel@gmail.com on January 01, 2008 at 17:23:53

Ok,
You posted this info:
terminal voltage my reading
h1 26.3 0
h2 32.6 6
12 150 0
15 75 0
22 26.3 0
25 372 0
Are you saying the readings are:
terminal voltage my reading
h1 Should be 26.3V, is: 0V
h2 Should be 32.6V, is: 6.6V
12 Should be 150V, is: 0V
15 Should be 75V, is: 0V
22 Should be 26.3V, is: 0V
25 Should be 372V, is: 0V
If that is so, then the transformer is not putting out the voltage it should. There are several reasons, mostly "shorted to ground" wiring that could be the problem. The fact that H1 doesn't have the proper voltage kind of says that something is "dragging it down." That means you should not turn it on for long. AND CHECK THAT THE BLACK STRIPE ON THE CAPACITOR IS SOLDERED TO H1! (it is embarrassing how easy this is to get wrong)
Measure the resistance from ground/common/terminal to A3 (good channel) and B3 (bad channel). If both are infinity (or reeeeeely high), reverse the leads of your meter and you might find out that the B channel LED is reversed.
My last guess is one that is also easy to get muffed up, check the diode orientation.
You should have a diode from H4 to T3 with the stripe toward T4.
You should have a diode from H4 to T5 with the stripe toward T5.
You should have a diode from H5 to T5 with the stripe toward H5.
You should have a diode from H5 to T4 with the stripe toward H5.
Your readings on T12, T15, T22 & T25 would say that the regulator is not passing any voltage to the B+(high voltage) circuit.
But I am not sure. The schematic doesn't have terminal numbers on it.
But this is a start.
Good luck.

"Remember, YOU are the only one who needs to like the sound of your system."
Grainger Morrison
There Is Only One (Grainger Morrison, it seems)

Edits: 01/02/08

Follow Ups:

RE: Second Try - eric.saletel!@gmail.com 16:01:40 01/06/08 (1)
- WOO HOO ! ! ! ! - Grainger49 16:46:26 01/06/08 (0)
Even more confusing. - Grainger49 12:41:00 01/02/08 (0)

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