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Introduction + Request (Kustom 88 Piano) [message #27690]

Sat, 29 February 2020 12:09

TelRay
Messages: 2
Registered: February 2020

Junior Member

Greetings and salutations y'all,
I've found this forum after a lot of unsuccessful searching for schematics for the Baldwin Kustom 88 Electric Piano, soy guys are kind of my last hope Smile

That search included: emailing people selling a piano like this, people who uploaded youtube videos about it, contacting Kustom themselves, etc.
The problem is the following:
I got this piano a couple of weeks ago and a resistor on the Power SupplyPCB was blown
The resistor is unreadable (no color code left)
I know this resistor acts as a voltage divider for the -25VDC rail sending some of that voltage to ground before sending the remaining voltage to the MOTOROLA ICs 514-063227 (unfortunately I have not been able to find the specs of this ICs, they seem to have been custom made)
What i need to know is the value of this resistor (either a photo of a working unit's circuit or a schematic would help)
Thank you!

PS: unfortunately i cannot post a link until i reach 10 messages so here is the incomplete link to the circuit's photo, identifying the missing resistor (easy to spot with all that burnt material around)

//i.ibb.co/DCmXwcM/IMG-0560.jpg

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Re: Introduction + Request (Kustom 88 Piano) [message #27697 is a reply to message #27690]

Mon, 02 March 2020 07:27

stevem
Messages: 4863
Registered: June 2004
Location: NY

Senior Member

You can get a schematic for that from music parts for 20 bucks and then we can help you.

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Re: Introduction + Request (Kustom 88 Piano) [message #27699 is a reply to message #27697]

Mon, 02 March 2020 08:51

TelRay
Messages: 2
Registered: February 2020

Junior Member

thank you Steven for suggesting MUSIC PARTS. Unfortunately I have only found "Kustom K88 Electronic Piano Owners/User Manual / Contents: An owners guide for the operation of the equipment"
No Schematics

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Re: Introduction + Request (Kustom 88 Piano) [message #27700 is a reply to message #27690]

Mon, 02 March 2020 12:41

stevem
Messages: 4863
Registered: June 2004
Location: NY

Senior Member

if that indeed has a regulated power supply then that burned up resistor is likely the one that sets the regulators voltage output limit.
In that case the resistor being toast means that the regulator is toast also.

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Re: Introduction + Request (Kustom 88 Piano) [message #29394 is a reply to message #27690]

Mon, 09 December 2024 18:02

toonomads
Messages: 1
Registered: December 2024
Location: Portland, Or

Junior Member

I just bought one of these, and I am looking to find some parts for these. Mainly the 2 switches for the vibrato. Any ideas where to find those? Thanks!

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Re: Introduction + Request (Kustom 88 Piano) [message #29405 is a reply to message #29394]

Tue, 17 December 2024 20:17

pleat
Messages: 1463
Registered: June 2004
Location: Belding, Mi

Senior Member

I have a copy of the PC5292 schematic. Not sure what board number you are looking for.
pleat

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Re: Introduction + Request (Kustom 88 Piano) [message #29499 is a reply to message #29405]

Sun, 20 April 2025 19:28

RocketMorton
Messages: 3
Registered: April 2025

Junior Member

Hey I've just picked up a kustom 88, I'm not quite sure which model but I've got an issue with feedback while using a damper pedal and this is the only place I've found anything about a schematic, you still have that kicking around perchance?

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Re: Introduction + Request (Kustom 88 Piano) [message #29501 is a reply to message #27690]

Mon, 21 April 2025 05:46

stevem
Messages: 4863
Registered: June 2004
Location: NY

Senior Member

Hello and welcome.

I have to look to see if I still have a copy of the schematic, but with that being said your issue is likely not feedback , but oscillation .

This is 99 % of the time caused by bad caps of the electrolytic type due to age.
If you only want to take the piano apart once I would plan on replacing every one of them .

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Re: Introduction + Request (Kustom 88 Piano) [message #29503 is a reply to message #29501]

Tue, 22 April 2025 15:48

RocketMorton
Messages: 3
Registered: April 2025

Junior Member

I actually found a screw wedging the last key to the frame and after removing that the sustain pedal noise went away. Not sure if that's at all related but a lucky fix regardless. If you do end up finding that schematic I would be very grateful! Especially as it's an old machine and likely needing some repairs sometime in the future

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