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Old 17th June 2011, 07:04 PM   #11
kmarei is offline kmarei  United States
diyAudio Member
 
Join Date: Mar 2010
Ok, i tested everything

for the 2 2SA1562s
1st
1-2: 0.007v and the meter beeps
1-3: 0.639v
2-3: 0.635v
2nd
1-2: 0.012v and the meter beeps
1-3: 0.641v
2-3: 0.634v

for the small round silver coloured cylinders with 3 legs
1-2: 0.644v
1-3: 0.001v and the meter beeps
2-3: 0.539v
second one
1-2: 0.645v
1-3: 0.014v and the meter beeps
2-3: 0.539v

for the outputs
for the 8 tip107s
1st
1-2: OL (i assume Over Limit)
1-3: 1.338v
2-3: 0.484v
2nd
1-2: OL
1-3: 1.338v
2-3: 0.484v
3rd
1-2: OL
1-3: 1.314v
2-3: 0.486v
4th
1-2: OL
1-3: 1.314v
2-3: 0.486v
5th
1-2: OL
1-3: 1.355v
2-3: 0.485v
6th
1-2: OL
1-3: 1.355v
2-3: 0.485v
7th
1-2: OL
1-3: 1.355v
2-3: 0.485v
8th
1-2: OL
1-3: 1.355v
2-3: 0.485v

for the 8 TIP102s
1st
1-2: 0.458v
1-3: 1.074v
2-3: OL
2nd
1-2: 0.458v
1-3: 1.074v
2-3: OL
3rd
1-2: 0.457v
1-3: 1.148v
2-3: OL
4th
1-2: 0.457v
1-3: 1.148v
2-3: OL
5th
1-2: 0.456v
1-3: 1.114v
2-3: OL
6th
1-2: 0.456v
1-3: 1.114v
2-3: OL
7th
1-2: 0.457v
1-3: 1.093v
2-3: OL
8th
1-2: 0.457v
1-3: 1.093v
2-3: OL

for the 2 regulators
1st
1-2: 0.885v
1-3: 0.428v
2-3: 0.640v
2nd
1-2: 0.753v
1-3: 0.990v
2-3: 0.445v

for the 4 rectifiers
1st
1-2: 0.4v
1-3: beep
2-3: 1.92v
2nd
1-2: 0.4v
1-3: beep
2-3: 1.92v
3rd
1-2: beep
1-3: beep
2-3: beep
4th
1-2: beep
1-3: beep
2-3: beep


if i had to guess
i'd say the outputs are all ok
the regulators are ok, but too different from each other so replace
the rectifiers, 2 are bad, other 2 ok (but might as well replace, to be safe)

am i correct?
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Old 17th June 2011, 07:11 PM   #12
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
One of the first 2 rectifiers is shorted. You can get replacements from J&R or Mouser (512-FEP16DTD).

You'll need to remove the shorted FETs and recheck the power supply driver transistors.
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Old 17th June 2011, 07:22 PM   #13
kmarei is offline kmarei  United States
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Join Date: Mar 2010
for the rectifiers
the 1st and 2nd are FEN16DT
the 3rd and 4th are FEP16DT

for the 2 regulators
1st is LM337T
2nd is LM317T
(shouldn't they be the same?)

and when i looked at the power supply transistors
the right side is bulging a little, on both of them
that's the side that has the 1-2 junction
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Old 17th June 2011, 08:30 PM   #14
diyAudio Member
 
Join Date: Sep 2006
The regulators are corrct..

The LM317 controls the Positive regulated voltages

The LM337 controls the Negative regulated voltages


The Fep16dt is for the positive rail voltages

The Fen16dt controls the Negative rail voltages..


So yes thoose are all the correct parts in the amp
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Old 17th June 2011, 08:35 PM   #15
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Join Date: Nov 2003
Location: Louisiana
You're right. I clicked the Ref405 file.

The regulators must be different. One is for positive voltage. The other is for negative voltage.
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Old 17th June 2011, 08:36 PM   #16
kmarei is offline kmarei  United States
diyAudio Member
 
Join Date: Mar 2010
so you still think one of the first 2 rectifiers is bad?
or is it the 3rd or 4th?

for the 4 rectifiers
1st
1-2: 0.4v
1-3: beep
2-3: 1.92v
2nd
1-2: 0.4v
1-3: beep
2-3: 1.92v
3rd
1-2: beep
1-3: beep
2-3: beep
4th
1-2: beep
1-3: beep
2-3: beep
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Old 17th June 2011, 08:44 PM   #17
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
With the meter set to ohms, do you read near 0 ohms across the outer legs of each rectifier?

Is the 'beep' a short beep or a steady tone?

What make/model meter are you using?
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Old 17th June 2011, 08:48 PM   #18
kmarei is offline kmarei  United States
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Join Date: Mar 2010
Fluke 115 True RMS multimeter

i get a 0.1ohm reading for all 4 rectifiers betwen legs 1-3

steady tone
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Old 17th June 2011, 08:52 PM   #19
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Join Date: Nov 2003
Location: Louisiana
That's normal. Post the 1-2 and 2-3 readings for one each of the FEN and FEP rectifiers with the meter set to ohms.
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Old 17th June 2011, 09:00 PM   #20
kmarei is offline kmarei  United States
diyAudio Member
 
Join Date: Mar 2010
for the 4 rectifiers
1st FEN16DT
1-2: 9 M ohm
1-3: 0.1 ohm
2-3: -4.6 M ohm
2nd FEN16DT
1-2: 8.5 M ohm
1-3: 0.1 ohm
2-3: -4.5 M ohm

3rd FEP16DT
1-2: 0.3 ohm
1-3: 0.2 ohm
2-3: 0.3 ohm
4th 3rd FEP16DT
1-2: 0.3 ohm
1-3: 0.2 ohm
2-3: 0.3 ohm
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