Kustopm 250-4

[mross001]

Found a red and green wire not connected to anything inside the amp. Cannot trace to where they might go. they were soldered to something. They each come off of a 10w 200ohm resistor stack. Any ideas

[Enzo]

What does the amp do wrong?

[Chuck H]

It looks like the amp doesn't do anything wrong. Because it doesn't do anything at all!

https://docs.google.com/a/mysvc.skag...YzQ/view?pli=1

Lower right page two and lower center page three. It looks like that's your voltage supply for all the preamp boards.?.

[52 Bill]

Found a red and green wire not connected to anything inside the amp. Cannot trace to where they might go. they were soldered to something. They each come off of a 10w 200ohm resistor stack. Any ideas

Those probably used to feed the pilot lamps inside the power and the polarity switches. Are the original switches still there?

[Chuck H]

Those probably used to feed the pilot lamps inside the power and the polarity switches. Are the original switches still there?

I saw those lamps and raised an eyebrow. I thought the same thing. "Maybe someone replaced the incandescent lamps with LED's or something.?." But the lamps are using 400R resistors and the board voltage supply uses the 200R resistors in the schematic. Then there are the red and green leads, labeled as such in the schematic too.

We'll need to hear from mross001 about the state of operation before we know more.

[Jazz P Bass]

https://docs.google.com/a/mysvc.skag...YzQ/view?pli=1

Can you post the actual schematic?

Google Drive wants me to sign on & I do not have an account.

[Chuck H]

No I can't. The site has the PDF's protected so I can't download them. Besides that, Kustom schematics are kind of funny (not "HA HA", more like the way old fish smells). The main amp schematics are model diagrams that indicate board number schematics you need to access separately. This site has all the info with main diagrams and specific board schematics. I hope you can read them from the site. There's no membership there and I didn't have to agree to anything to view or link them.

Welcome to VintageKustom.Com!

[Jazz P Bass]

Thanks for the info.

[mross001]

no output from the inputs. Reverb is active. dis-connected wires might power preamp boards but where to solder them? Power/polarity switch has been replaced with a 3 position toggle, up/on middle/off down /on.

[Jazz P Bass]

I cannot download the schematics.



Well, they let me have this one at least:

PC5069.pdf

OP, you need to check the power supply.
If you feel the problem is in the preamp, at least check any opamp for power to the supply pins.
On the preamp header, you can access the supply coming into the board.

Pin 1: -12Vdc
Pin 4: +12Vdc
Pin 5&6: Ground
Pin 9: Signal output

PC5069 Header.pdf

[52 Bill]

The preamps are supplied from the red and green wires that are regulated by the zener diodes via the molex plugs. These wires are connected directly to the power resistors from the power supply. They used to connect to the pilot lamps in the two front panel switches.

[g1]

I cannot download the schematics.

They are viewable but not for download.
Here are direct links:
PC5065 https://docs.google.com/file/d/0B1Fx...Ulk/view?pli=1
PC5066 https://docs.google.com/file/d/0B1Fx...ZW8/view?pli=1
PC5067 https://docs.google.com/file/d/0B1Fx...YVE/view?pli=1
PC5069 https://docs.google.com/file/d/0B1Fx...eEk/view?pli=1

[Jazz P Bass]

They are viewable but not for download.
Here are direct links:
PC5065 https://docs.google.com/file/d/0B1Fx...Ulk/view?pli=1
PC5066 https://docs.google.com/file/d/0B1Fx...ZW8/view?pli=1
PC5067 https://docs.google.com/file/d/0B1Fx...YVE/view?pli=1
PC5069 https://docs.google.com/file/d/0B1Fx...eEk/view?pli=1

Same thing.

[g1]

I can view them all. Chuck also mentioned he was able to view them.
Browser issue?

[Jazz P Bass]

PC5065-5067 I get that 'Whoops' thingy.

PC5069 has a little blue download button.



I can download that file fine.

I am running Vista with IE9.