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Old 4th December 2012, 10:38 PM   #1
dhamia is offline dhamia  United Kingdom
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Default Alpine 1507 repair

Hi I have picked up an alpine 1507 that has an issue
With the RCA input terminals.

The terminals have been damaged, looks like it had been dropped and they have
lost 2 gold outer caps.

I decided to pull the whole terminal and replace it with
individual chassis mount type plugs as it was only making sound if you
moved the plugs about- they had worked loose on the board.

The amp seemed to work fine before I fitted the new RCA input plugs
it now produced a very distorted sound.

Any ideas?
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Old 4th December 2012, 10:47 PM   #2
dhamia is offline dhamia  United Kingdom
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The soldering points for the RCA inputs appear to lead into

Integrated Circuit NJM4560L DUAL OPERATIONAL AMPLIFIER

Could it be somehow damaged or shorted?
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Old 5th December 2012, 12:41 AM   #3
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Location: Louisiana
Post a photo of the new jacks showing how you connected them to the amp.
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Old 5th December 2012, 10:22 AM   #4
dhamia is offline dhamia  United Kingdom
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Hi Perry,

I have now removed the new plugs as I had actually wired the earth and positive signal leads the wrong way...... (they looked right when I matched them to the original plug but when I tested the plug with a meter it was obvious I got them the wrong way round)

I have removed the new plugs - there are just 6 wires extending from the board now.

The sound is very loud and distorted when I connect the center pin of my signal rca
( i am using an old sony cd tuner)

The green music light flashes when a sound source is added

I fear I may have caused the distortion issue by wiring the plug the wrong way.
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Old 5th December 2012, 09:23 PM   #5
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You should not have caused any damage connecting the wires incorrectly.

Do you read 0 ohms between the shield grounds and the non-bridging speaker terminals?

Do the center conductors of the two input jacks connect directly to E101 and E102?
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Old 6th December 2012, 09:03 AM   #6
dhamia is offline dhamia  United Kingdom
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Hi Perry
The centre conductors lead to E101 and E102

I did the sheild ohm test with meter set on continuity
and the reading stayed on 1
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Old 6th December 2012, 09:23 AM   #7
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It should read the same as when you touch the probes together.
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Old 6th December 2012, 10:32 AM   #8
dhamia is offline dhamia  United Kingdom
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My meter beeps and shows 000 when the probes
join, when I test the ground shield against the speaker terminals
there is no change or beep
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Old 6th December 2012, 03:37 PM   #9
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Do you find any solder pads in the area of the RCA jacks that read 000 to the non-bridgingg speaker terminals?
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Old 6th December 2012, 04:01 PM   #10
dhamia is offline dhamia  United Kingdom
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Just checked, nothing reads 000
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