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Old 1st November 2005, 11:44 PM   #1
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Default wont turn on

linear power 2.2 hv wont power up. where do i start my diagnosis.
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Old 2nd November 2005, 02:55 AM   #2
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Why don't you start with what you've already done?
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Old 2nd November 2005, 04:53 PM   #3
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Default ok.

I talked to perry babin... and he suggested the pwm... i know where it is but i deleted the data and the email with it. so i need to know how to check it. I believe I am looking for a voltage reading at one of the pins in and one out. The amp has test points for power and ground. i have used both as testing points and get a 12v reading. It makes sense that the remote is what isnt turning on as he suggested. Do i use the amps ground as the ground to test the pins for the pwm?


Perry if you are reading this.... thanks for all your help I look forwad to reading anything you write.

D
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Old 2nd November 2005, 07:21 PM   #4
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Apply +B, remote and ground to the amp as you normally would. Ground the meter's black lead to the ground for the amp. Measure the DC voltage for each pin on the PWM IC. If you deleted the datasheet, do a Google search. You'll get lots of sites from which to download the datasheet for the PWM IC. Post the voltages you read like this:

Pin 1: xx volts
Pin 2: xx volts
Pin 3...

Look at the datasheet for the pin numbering configuration for the IC.

From that point, someone here will be able to help. I'll check back regularly for your post.
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Old 2nd November 2005, 07:52 PM   #5
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Default Perry

You are the man. Thanks. I found the email that had the link....i was looking for a email with an attachment.... been driving my self nuts. any way ill keep you posted.
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Old 3rd November 2005, 05:16 AM   #6
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Default OK HERE WE GO.

THE SG3525AN READINGS for the linear power 2.2

pin 1: 0.00 volts
pin 2: 5.20 volts
pin 3: 0.021 volts
pin 4: 0.205 volts
pin 5: 2.053 volts
pin 6: 3.85 volts
pin 7: 2.032 volts
pin 8: 4.94 volts
pin 9: 6.07 volts
pin 10: 0.00 volts
pin 11: 5.20 volts
pin 12: 0.00 volts
pin 13: 11.69 volts
pin 14: 5.12 volts
pin 15: 12.59 volts
pin 16: 5.20 volts

now that I have these numbers what am i looking for?

thanks again.
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Old 3rd November 2005, 08:47 AM   #7
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It looks like the chip is running and producing output.

Measure the DC voltage on the legs of the 4 rectifier diodes near the middle of the heatsink (near the large capacitors). You can list the various voltages randomly. If you have several close to the same value, only list the value once.

What model meter do you have?
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Old 3rd November 2005, 02:33 PM   #8
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Default OK ILL DO THAT TONIGHT.

the meter is a fluke 73 i think... ill look tonight aswell

thanks
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Old 4th November 2005, 06:06 AM   #9
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Default OK HERE IS THE INFO

first the meter i have is a fluke 23. second i tested the l.e.d with the amps b+, gnd and remote on..... nada. no power to either leg i did a continunity test on the l.e.d. and didnt get a tone. ill feel foolish if it has a bad l.e.d.

i want sure which diodes you needed were so i got all of them that i could see

ill list them as follows

d1 leg 1: 12.54 volts, leg 2: 0.00

d2 leg 1: 12.51 volts, leg 2: 12.49

d3 leg 1: 12.65 volts, leg 2: 0.00

d4 leg 1: volts, leg 2:

d5 leg 1: volts, leg 2:

d6 leg 1: 0.027 volts, leg 2: 0.034

d7 leg 1: 0.040 volts, leg 2: 0.028

d8 leg 1: 0.031 volts, leg 2: 0.014

d9 leg 1: 0.020 volts, leg 2: 0.020

d10 leg 1: 0.016 volts, leg 2: 0.020

d11 leg 1: 12.60 volts, leg 2: 12.60

d12 leg 1: volts, leg 2:

d13 leg 1: 0.027 volts, leg 2: 0.035

d14 leg 1: 0.020 volts, leg 2: 0.020

d15 leg 1: 0.062 volts, leg 2: 0.031


the blank ones i couldnt find.

i also tested the other chips

U1 (4N26 8047)
pin 1: 0.004 volts
pin 2: 0.025 volts
pin 3: 0.002 volts
pin 4: 0.000 volts
pin 5: 12.53 volts
pin 6: 0.001 volts



U2 (klh9612)
pin 1: 0.00 volts
pin 2: 12.50 volts
pin 3: 0.103 volts
pin 4: 12.48 volts
pin 5: 8.38 volts
pin 6: 0.004 volts
pin 7: 0.004 volts
pin 8: 12.60 volts

U5 (op275)
pin 1: 0.023 volts
pin 2: 0.020 volts
pin 3: 0.018 volts
pin 4: 0.026 volts
pin 5: 0.018 volts
pin 6: 0.018 volts
pin 7: 6.00 +/- volts
pin 8: 4.00 +/- volts

pins 7 and 8 on U5 started off @ 2 volts and climbed to the numbers i posted... they never stopped but would fluctuate.. those number being a close average.

U6 (op275)
pin 1: 0.027 volts
pin 2: 0.024 volts
pin 3: 0.021 volts
pin 4: 0.025 volts
pin 5: 0.032volts
pin 6: 0.019 volts
pin 7: 0.025 volts
pin 8: 0.018 volts

ok so that is what i have tested. what is my next step?

Thanks all, i really appreciate the school sessions.
D
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Old 5th November 2005, 01:10 AM   #10
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Default HERE ARE THE NUMBERS

THE 4 DIODES in the middle are as follows

IIDN1II leg 1: 0.02 volts leg 2: 0.02 volts
IIDP2II leg 1: 0.02 volts leg 2: 0.02 volts
IIDN2II leg 1: 0.01 volts leg 2: 0.01 volts
IIDP1II leg 1: 0.01 volts leg 2: 0.01 volts

I also checked q41, q42, q43 and q44 values are

Q41: leg 1 12.56 volts, leg 2 12.48 volts, leg 3 11.76 volts

Q42: leg 1 12.56 volts, leg 2 11.87 volts, leg 3 12.56 volts

Q43: leg 1 12.49 volts, leg 2 12.56 volts, leg 3 0.00 volts

Q44: leg 1 0.03 volts, leg 2 0.69 volts, leg 3 0.00 volts

what is next....... ill get this thing hammered out yet!
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