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Old 16th June 2011, 12:45 AM   #1
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Default Directed 1500D

All of the outputs are removed right now since some were defective..

Amp is still stuck in protection mode..

Heres what i get on the 494

Pin1:0
Pin2:4.96
Pin3:.05
Pin4:4.84
Pin5:1.46
Pin6:3.64
Pin7:0
Pin8:13.04
Pin9:0
Pin10:0
Pin11:13.04
Pin12:13.04
Pin13:4.96
Pin14:4.96
Pin15:4.96
Pin16:4.96
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Old 16th June 2011, 05:32 AM   #2
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Location: Louisiana
Post a photo of the inside of the amp.
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Old 16th June 2011, 04:51 PM   #3
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Heres the pics of the board..
Attached Images
File Type: jpg Directed.JPG (89.4 KB, 42 views)
File Type: jpg Directed 1.JPG (95.5 KB, 42 views)
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Old 16th June 2011, 05:57 PM   #4
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Location: Louisiana
Re-check the voltage on pin 16. 13, 14 and 15 may be shorted together which would account for having precisely the same voltage on those but pin 16 wouldn't be shorted to those and is unlikely to have precisely the same voltage.
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Old 16th June 2011, 07:45 PM   #5
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Pin13:4.96
Pin14:4.96
Pin15:4.96
Pin16:0
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Old 16th June 2011, 07:53 PM   #6
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Pin16 goes to a transistor C3198 (location Q1)
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Old 16th June 2011, 07:58 PM   #7
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Do you see a pulse of DC on the large output filter inductors as the amp tries to power up?

Is pin 4 of the 494 connected to the collector of a PNP transistor (possibly through a low value resistor)?
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Old 16th June 2011, 07:59 PM   #8
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It's likely that pin 16 is connected to ground. The protection drive is coming in on pin 4.
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Old 16th June 2011, 08:11 PM   #9
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If your talking about theese they both have 3.50 volts on them and the voltages remains constant..


Pin 4 connects to a C3198 (Q14)
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Old 16th June 2011, 08:13 PM   #10
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DC offset must be what's shutting it down.

Post the DC voltage on all of the pins of the B52 IC.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
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