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Old 6th November 2009, 12:33 AM   #21
fongman is offline fongman  United States
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I think i found it. Right next to the bias on that channel.
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Old 6th November 2009, 03:28 AM   #22
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From the screen cap, Q221 appears OK (assuming that it was checked in the board).

Check R265. Is it within tolerance?

If so, pull Q212. Does the amp still have positive rail voltage on the speaker terminal (black probe on chassis ground)?
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Old 6th November 2009, 03:50 AM   #23
fongman is offline fongman  United States
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I got 20.1 ohms on R265. With Q212 out i got 3.6v.
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Old 6th November 2009, 04:08 AM   #24
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With the amp powered up and the black probe on chassis ground, post the DC voltages on Q219, 220 and 224. For the SMD transistor, the pins are 1 and 2 on the bottom (left to right) with 3 on top.

Q220
Leg 1:
Leg 2:
Leg 3:

Q219
Leg 1:
Leg 2:
Leg 3:


Q224
Leg 1:
Leg 2:
Leg 3:
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Old 6th November 2009, 04:25 AM   #25
fongman is offline fongman  United States
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Should i put q212 back 1st?
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Old 6th November 2009, 04:30 AM   #26
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No.
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Old 6th November 2009, 05:07 AM   #27
fongman is offline fongman  United States
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Q220
Leg 1: 32.5v
Leg 2: 32.02v
Leg 3: 32.54v

Q219
Leg 1: 32.04v
Leg 2: 3.60v
Leg 3: 32.54v


Q224
Leg 1: 32.04v
Leg 2: 3.60v
Leg 3: 32.54v
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Old 6th November 2009, 06:07 AM   #28
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Check Q212. Use the link above the one you used to check the SMD transistor and send me the screen cap.
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Old 6th November 2009, 08:42 PM   #29
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With 212 out of the circuit, what is the DC voltage on it's solder pads (square solder pad = pin 1)?

Q212 pads
Pin 1:
Pin 2:
Pin 3:

What is the voltage on the terminals of Q202 and Q203 (see attached for layout)?

Q202
Pin 1:
Pin 2:
Pin 3:

Q203
Pin 1:
Pin 2:
Pin 3:
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File Type: jpg smdpins01.jpg (18.8 KB, 30 views)
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Old 6th November 2009, 09:10 PM   #30
fongman is offline fongman  United States
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Q212 pads
Pin 1: .89v
Pin 2: 14.47v
Pin 3: 31.90v


Should i test Q202 and Q203 with the black on the amp ground?

Last edited by fongman; 6th November 2009 at 09:22 PM.
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