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GK 1001RB II amp repair - help!

C

chowderhead1962

Apr 28, 2013
35
8
#1
Hi I have a GK 1001RB 2 that had the input jack break off. I bought a replacement for it, and unsoldered the holes, popped the new jack in, and resoldered it. I then connected all the connectors back onto the board and fired it up. But all I hear is a hiss and if I bring the volume up it then makes a big hum sound. I'm not really sure what I did wrong. Any ideas? Did I fry the board?

thx
David
 
#2
chowderhead1962 said:
Hi I have a GK 1001RB 2 that had the input jack break off. I bought a replacement for it, and unsoldered the holes, popped the new jack in, and resoldered it. I then connected all the connectors back onto the board and fired it up. But all I hear is a hiss and if I bring the volume up it then makes a big hum sound. I'm not really sure what I did wrong. Any ideas? Did I fry the board?

thx
David
Click to expand...

Sounds like you shorted something somewhere. Best take it to a qualified tech to sort it out. Don’t risk any further issues.
 
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#7
Without repairing the additional damage, that's a 1 hour repair tops for a qualified tech. Say if it even $75, that would generally be a lot less than going in and mopping up additional damage.
 
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#10
The other really dumb thing I did was not "mark" the tweeter and woofer leads that go from the circuit board to the front board. So I'm not entirely clear whether I had the facing forward or backward. I tried them both ways, but nothing changed.
 
#11
chowderhead1962 said:
The other really dumb thing I did was not "mark" the tweeter and woofer leads that go from the circuit board to the front board. So I'm not entirely clear whether I had the facing forward or backward. I tried them both ways, but nothing changed.
Click to expand...

Even more reason to take the unit to a qualified Tech.
 
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#13
chowderhead1962 said:
The other really dumb thing I did was not "mark" the tweeter and woofer leads that go from the circuit board to the front board. So I'm not entirely clear whether I had the facing forward or backward. I tried them both ways, but nothing changed.
Click to expand...

When you say facing forward and backward, what do you mean?

These are the guys you're talking about, right? I seemed to remember them being notched so that they could only be inserted the "right" way, but maybe I'm mistaken.
IMG_20170817_130259080.jpg
 
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#14
Kro said:
When you say facing forward and backward, what do you mean?

These are the guys you're talking about, right? I seemed to remember them being notched so that they could only be inserted the "right" way, but maybe I'm mistaken.View attachment 3434988
Click to expand...

Yes those are the leads, but it is the other end (the board that has all the inputs) that I forgot to mark. They can be inserted onto the two prong leads in either direction. I thought I had put them on correctly, but in either case it didn't work either way. I'll post some photos of the boards in a little bit.
 
#16
chowderhead1962 said:
Yes those are the leads, but it is the other end (the board that has all the inputs) that I forgot to mark. They can be inserted onto the two prong leads in either direction. I thought I had put them on correctly, but in either case it didn't work either way. I'll post some photos of the boards in a little bit.
Click to expand...

My memory is that they were a similar style... but I also only ever detached them from the power amp board. :unsure:

img_20170817_112127222-jpg.1410562
 
#17
chowderhead1962 said:
Hi I have a GK 1001RB 2 that had the input jack break off. I bought a replacement for it, and unsoldered the holes, popped the new jack in, and resoldered it. I then connected all the connectors back onto the board and fired it up. But all I hear is a hiss and if I bring the volume up it then makes a big hum sound. I'm not really sure what I did wrong. Any ideas? Did I fry the board?

thx
David
Click to expand...


I don't know about the construction of the 1001RB. On my older 2000RB, there are little wires in some of the holes where components are mounted instead of direct connection to the solder traces. The wires are actually twisted around the component leads when they are soldered. It's very easy to break the wires off when you remove a component. Without the wire, the terminal of the component does not have continuity with the circuit trace even though it is soldered in place

I suggest taking a look at the circuit board and tracing out the circuit path from the jack to ground and also the first component in the signal path, which should be a resistor. Check continuity between where the jack is soldered to the board and these two points. If continuity is broken, use use small wire to bridge the gap.
 
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#18
chowderhead1962 said:
Yes those are the leads, but it is the other end (the board that has all the inputs) that I forgot to mark. They can be inserted onto the two prong leads in either direction. I thought I had put them on correctly, but in either case it didn't work either way. I'll post some photos of the boards in a little bit.
Click to expand...

Weird that your's are reversible. Pretty sure the ones on my 2000RB and 700RB are keyed so they can only be inserted one way.
 
#19
Wasnex said:
Weird that your's are reversible. Pretty sure the ones on my 2000RB and 700RB are keyed so they can only be inserted one way.
Click to expand...
I would be shocked it they were reversible too. Now with enough force, anything can probably be reversed...
 
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#20
IMG_2087.jpg
Here is the resoldered jack.
IMG_2088.jpg
These are the effects jacks for comparison
IMG_2089.jpg
This is the tweeter lead I was mentioning. The tweeter and woofer leads in the input board both have the same connector. And they can be put on either way.
 

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