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Old 14th November 2012, 04:36 PM   #11
rrae is offline rrae  Norway
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1. 0.00
2. 4.93
3. 0.01
4. 0.22
5. 2.05
6. 3.47
7. 2.03
8. 4.68
9. 1.36
10. 0.01
11. 1.38
12. 0.00
13. 11.04
14. 1.43
15. 11.04
16. 4.94
Voltage at terminals - 13.38V
Ground as reference.
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Last edited by rrae; 14th November 2012 at 04:39 PM.
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Old 14th November 2012, 07:44 PM   #12
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For U305 with the black probe on the center leg, what is the DC voltage on the two other legs?
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Old 15th November 2012, 04:11 AM   #13
rrae is offline rrae  Norway
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pin 1: 2.40V
pin 3: 28.8V
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Old 15th November 2012, 05:56 AM   #14
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Measure the DC voltage on both halves of U303A.

For one place the red probe on pin 1 and the black probe on pin 2.

The other other side, place the red probe on pin 4 and the black on pin 3.
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Old 15th November 2012, 04:34 PM   #15
rrae is offline rrae  Norway
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red pin 1, black 2 - 1.01v
red 4, black 3 - 0.43v
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Old 16th November 2012, 05:15 AM   #16
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The opto-coupler and regulator are causing the pulse width to be too low. Confirm that the following resistors are within tolerance (you may have to desolder one terminal to be sure) and that all match the values on the diagram.

R328
R329
R309
R358
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Old 16th November 2012, 07:22 PM   #17
rrae is offline rrae  Norway
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These resistors are ok.
This dont make sense to me - if i set power supply voltage more than 12.9V - power supply transistors are not drived correctly, by voltage what i did mention earlier - 1,49v.
If i set 12.4v, i get correct drive voltage around 4.96 on all supply transistors. But then i get only -63v rail and still old +33v rail on rectifiers.
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Old 16th November 2012, 09:09 PM   #18
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Are you saying that you get +33v and -63v rails?
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Old 16th November 2012, 09:36 PM   #19
rrae is offline rrae  Norway
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I might have been wrong, but if i remember correctly, yes, i should recheck then. But i dont understand, why drive voltage is not correct at 13v, but it is correct at 12.4v When drive voltage is "good", i can get negative regulated voltage on regulators and opamps, i do get -14v at 7915, but still old +7v on 7815
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Last edited by rrae; 16th November 2012 at 09:40 PM.
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Old 16th November 2012, 09:40 PM   #20
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This amp has a regulated power supply. When the voltage reaches the target rail voltage, it reduces the pulse width so that the rail remains precisely at the target voltage. When the pulse width is reduced, it will read less than 5v. In some amps, it can read as low as a fraction of a volt when the amp is at idle. When you reduce the input voltage, the pulse width has to increase to try to maintain the target rail voltage. When the pulse width increases, it reads as a higher DC voltage.
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