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Phoenix Gold MS-2125 no rail voltage
Phoenix Gold MS-2125 no rail voltage
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Old 16th November 2019, 12:52 AM   #11
Perry Babin is offline Perry Babin  United States
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Measure the DC voltage across all 4 of those diodes.

What's the DC voltage on all 3 terminals of the transistor that you replaced?
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Old 16th November 2019, 03:09 AM   #12
Chopperbuilder is offline Chopperbuilder  United States
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The DC voltage on the three legs of the transistor are:
1. +10.8v
2. +10.7v
3. +10.0v


As to the diodes will you please point out which 4 you are referring to?
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Old 16th November 2019, 03:23 AM   #13
Perry Babin is offline Perry Babin  United States
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Sorry. The 4 red LEDs that are not lit.

What's the supply voltage across the B+ and ground terminals of the amp?

Post the DC voltage on all pins of one of the PS driver ICs.
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Old 16th November 2019, 03:55 AM   #14
Chopperbuilder is offline Chopperbuilder  United States
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See attached photo for DC voltage readings across the 4 LED's.


The supply voltage across the B+ and ground terminals of the amp is +10.8v


DC voltage of PS driver IC:
1. +0.001v
2. +2.15v
3. +0.20v
4. +0.497v
5. +2.022v
6. +3.623v
7. +1.942v
8. +4.81v
9. +6.19v
10. +0.008v
11. +4.05v
12. +0.001
13. +10.77v
14. +4.05v
15. +10.77v
16. +5.06v
Attached Images
File Type: jpg 20191115_141822-2.jpg (924.5 KB, 25 views)
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Old 16th November 2019, 04:05 AM   #15
Perry Babin is offline Perry Babin  United States
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Why is it so low? Increase it to about 12v.

What's the DC voltage on the pins of either of the opto-couplers?
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Old 16th November 2019, 04:35 AM   #16
Chopperbuilder is offline Chopperbuilder  United States
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I'm not sure what is pulling it down. There is almost a 2v drop between what the power supply meter is showing and the reading at the amp terminals. I turned it up voltage at the amp terminals is now 12.2v


I'm guessing you are refer to one of the opto-couplers that are to the right and left of the PS driver ICs...


DC Voltage on the opto-coupler on the right in the photo in #14:
1. -2.1v drops very rapidly
2. -2.1v drops very rapidly
3. -0.002v
4. +2.52v
5. +5.06v
6. +3.19v
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Old 16th November 2019, 05:11 AM   #17
Perry Babin is offline Perry Babin  United States
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Measure directly across 1/2 and then across 4/5/
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Old 16th November 2019, 05:42 AM   #18
Chopperbuilder is offline Chopperbuilder  United States
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The DC voltage across 1/2 is +1.10v, 4/5 is +2.54v
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Old 16th November 2019, 06:02 AM   #19
Perry Babin is offline Perry Babin  United States
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Do both read the same?

If you increase the supply voltage (at the amp) to about 13.5v, does the voltage at 1/2 top out higher or does it remain about the same?
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Old 16th November 2019, 06:20 AM   #20
Chopperbuilder is offline Chopperbuilder  United States
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I'm not sure what you are asking me "Do both read the same?"


I only able to increase the supply voltage at the amp up to 13v. The voltage across 1/2 remains the same regardless if supply voltage is 12v or 13v.
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