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JL 500/1 component identification
JL 500/1 component identification
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Old 3rd June 2020, 12:42 PM   #1
randy0050 is offline randy0050  United States
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Default JL 500/1 component identification

JL 500/1 PCB 100005 Rev 10

Amp had low volume and muddy audio, then went out completely
RCA input read short. I need help identifying this part.
Itís in front of the supply capacitors
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Old 3rd June 2020, 12:59 PM   #2
Perry Babin is offline Perry Babin  United States
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Zener diode. I've seen both 5.6 and 6.8v there. Either will work.
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Old 4th June 2020, 11:00 PM   #3
randy0050 is offline randy0050  United States
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Thank you.
I changed diode and started checking voltages on 10 pin connector near +- inputs and got to pin 4 , then blew changed diode again and small pop sound emitted from test speaker . when pin 4 probed for voltage.
1. 5v
2. -14.9v
3. 13.7v
Low power input selected and gain set lowest position
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Old 4th June 2020, 11:09 PM   #4
Perry Babin is offline Perry Babin  United States
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I think you likely shorted one of the 13v pins to pin 4. The diode has a series resistor to prevent excess current. The only other connection to it, as far as I know, is the LM324.
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Old 5th June 2020, 01:50 AM   #5
randy0050 is offline randy0050  United States
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So the resistor to the diode you believe is shorted? My eyesight is bad enough so could you direct me to the area of that resistor?
Also D611 and D612 are measuring short across each of them. I lifted D612 and it’s not faulty
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Old 5th June 2020, 02:15 AM   #6
Perry Babin is offline Perry Babin  United States
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It's virtually impossible that the current limiting resistor is shorted.

Where are D611 and D612?
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Old 5th June 2020, 07:28 AM   #7
randy0050 is offline randy0050  United States
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I was praying it was muting component that Iíve read about in similar posts here. I still havenít lifted it because my voltages werenít similar enough
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Old 29th June 2020, 09:33 PM   #8
randy0050 is offline randy0050  United States
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The leg with the white (corrosion?) connects with the zener that keeps blowing. Is the white indication of it being bad?
Also d611 and d612 both read shorted in circuit but read good out of board
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Old 29th June 2020, 11:36 PM   #9
Perry Babin is offline Perry Babin  United States
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Are you referring to the white paint on the transformer?
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Old 30th June 2020, 02:28 AM   #10
randy0050 is offline randy0050  United States
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Is it paint? I just noticed it and thought it was from heat or bad connection.
The diode traces back to pin 9 which is negative input for pin 8,

Last edited by randy0050; 30th June 2020 at 02:32 AM.
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