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Pioneer KEX-M900 troubleshooting
Pioneer KEX-M900 troubleshooting
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Old 24th November 2020, 10:22 AM   #21
Perry Babin is offline Perry Babin  United States
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Pin 5 shouldn't drag the signal down. The IC or one of the capacitors connected to pin 5 may be defective.
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Old 24th November 2020, 10:31 AM   #22
vincegironda is offline vincegironda
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Thanks Perry

Sorry I'm a little confused, by IC do you mean IC757?

There are 4 capacitors in the 763 circuit should I go ahead and replace all 4?
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Old 24th November 2020, 10:41 AM   #23
vincegironda is offline vincegironda
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I just pulled the caps and tested them, all appear good and within tolerance
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Old 24th November 2020, 10:46 AM   #24
Perry Babin is offline Perry Babin  United States
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I was referring to the op-amp IC763 (the one that caused the signal from IC764 to be dragged down).

Before replacing anything, measure the resistance from IC763, pin 5 to ground and compare that resistance to the readings on pin 5 of the other op-amps.
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Old 24th November 2020, 11:02 AM   #25
vincegironda is offline vincegironda
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Pin 5 to ground resistance

764 42.8 k Ohm
763 000.7 Ohm
762 43.1 k Ohm
761 1.93 m Ohm
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Old 24th November 2020, 11:08 AM   #26
Perry Babin is offline Perry Babin  United States
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If it's easily accessible, remove it and re-check.
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Old 24th November 2020, 11:24 AM   #27
vincegironda is offline vincegironda
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With 763 removed

764 42.8 k Ohm
763 000.2 ohm
762 43.1 k Ohm
761 1.8 m Ohm
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Old 24th November 2020, 11:25 AM   #28
Perry Babin is offline Perry Babin  United States
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It would appear that the fault is a shorted capacitor.
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Old 24th November 2020, 11:39 AM   #29
vincegironda is offline vincegironda
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I just checked all the capacitors on the dsp board and none are shorted

Should I pull them off the board and re test?
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Old 24th November 2020, 11:42 AM   #30
Perry Babin is offline Perry Babin  United States
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Something connected to pin 5 has to be shorted. C793 is the most likely suspect.
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