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Old 6th April 2015, 10:41 PM   #1
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Default Directed 1500D intermittent operation

Directed 1500D Amp. Had the setup for a few years no problems no changes. One day amp starts cutting in and out. Power light is on as normal, protect light is not on. I figure out that if I apply light pressure to the RCAs or the bass control cord it works flawlessly, both are on the same end of the circuit board. I open the amp up nothing obvious wrong or burnt, solder joints appear good. The mounting points of the board are inboard about two inches. If I apply light pressure to the same end of the board as rcas/bass control port amp works flawlessly. Where do I go from here?
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Old 6th April 2015, 11:37 PM   #2
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Maybe the RCA's have become loose fitting ?
Other than that soldered joints on large connectors are notorious for becoming dry joints.

I have had a couple of TV's where the scart connectors become loose due to cold soldered joints.
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Old 6th April 2015, 11:55 PM   #3
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Have you operated all of the controls through their entire range to see if any are at fault.
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Old 7th April 2015, 02:05 AM   #4
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I feel like its a bad solder joint somewhere. What is the proper method for checking the joints?
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Old 7th April 2015, 02:29 AM   #5
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Bad solder connections are not common on double-sided boards. If they are bad, it's typically obvious (visually).
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Old 7th April 2015, 02:55 AM   #6
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The solder connections break or crack on the 2 vertical boards in the amp ..

They crack mainly on the vertical board to main board .

The board containing the gain control is the suspect ..

I've seen this in every D1500 that I've repaired

Lift the plate over the gain and crossover controls power the amp up and push on those boards where they connect to main board and see if that's where the problem is

Last edited by S Merlington; 7th April 2015 at 02:57 AM.
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Old 7th April 2015, 04:33 AM   #7
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Quote:
Originally Posted by S Merlington View Post
The solder connections break or crack on the 2 vertical boards in the amp ..

They crack mainly on the vertical board to main board .

The board containing the gain control is the suspect ..

I've seen this in every D1500 that I've repaired

Lift the plate over the gain and crossover controls power the amp up and push on those boards where they connect to main board and see if that's where the problem is
Spot on Sir, vertical gain board to main board. The joints didn't look bad but didn't look good either. There are 6 joints on one side 8 on the other. I reflowed 2 as they had plenty of solder already, applied a dab to the rest. Installed it and it sounded like new. I will road test it tomorrow but all sounds good for now. Thank you all who replied.
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Old 7th April 2015, 07:16 AM   #8
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For reliable repair of broken solder joints, you should apply new solder, desolder and re-solder again. If you just re-flow, you can leave a layer of oxidized solder which can quickly fail again.
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Old 10th April 2015, 04:56 PM   #9
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Originally Posted by Perry Babin View Post
For reliable repair of broken solder joints, you should apply new solder, desolder and re-solder again. If you just re-flow, you can leave a layer of oxidized solder which can quickly fail again.
Agreed, at the time I had no way of removing the old solder, but removing the old would have been my preferred repair method as well.

I had a typo the amp is actually a 1100D but I would imagine the two have similar board designs.
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