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What are the values ,old sidekick 10, got sent a schematic with no diode values can anyone help with a comprehensive schematic or knows the values of diodes 3,4,5, on the power input side of the circuit board ??

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6ya6ya
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Posted on Jan 02, 2017

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Posted on Oct 23, 2008

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SOURCE: phase 90 dead no led no nothing

One needs to consider the history of the unit. Could someone have used a reversed power adapter? If so they probably blew those diodes.

Input power protection diodes are often in the 1N4004 family.

Do not change any diodes without knowing the type. There may be Zeners as part of the effect shaping.

Check the power getting to the Op amps... pin 8 and 4 are the power pins, 8 being positive. Don't get fooled as sometimes the circuitry has the positive as signal ground.

ONLY SHOTGUN a device as last resort.

Posted on Dec 11, 2009

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SOURCE: Where can I get a schematic of the circuit board

Just a hint to troubleshoot: Connect a 100 Watt light bulb in series with the hot side of the power line into the amp. Make a cord with a light socket and a receptacle to plug the amp into. This acts as a resetable fuse and will send enough current through the amp to not fry stuff, but enough to do troubleshooting.

Posted on Apr 02, 2010

caroldon
  • 17130 Answers

SOURCE: Can someone tell me the value of D1 on the

This is a normal signal diode and used a signal shaper or for blocking. Ideally you can use a univerrsal signal diode- IN4148 would be good enough.
You have not mentioned the fault of the set and how tthis diode had been damaged but if there is any more please respond.
You will get to buy this from any spare shop or maybe if you have any old electronic boards around , it can be salvaged , but not rectifier diodes please
Hope you find my advice helpful Good day .

Posted on Aug 16, 2010

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SOURCE: PRESS THE KEYS..NO NOISE..KEYBOARD FROM '

The diodes are disconnect diodes for the scanning matrix. It is unlikely they are bad. There is no mechanism between the silicone cups and the keys. I hope you cleaned the rubber pills AND the circuit traces they contact with ONLY 99% isoprophyl alcohol as contact cleaners such as DeOxit and Blue shower destroy the conductive rubber pills. Use ONLY 99% isoprophyl alcohol and QTips to clean both the pills and the circuit traces. Note: the contacts do NOT go to zero ohms as they gate electronic signals and they can be 1K ohms or so and still work. There are two contacts per key to implement key velocity measurement.
Go to this site:

http://elektrotanya.com/korg_sas-20_sm.pdf/download.html

Find the link "get manual" and click on it to download the service manual. Ignore the other download links as they are for other apps.

Posted on Jun 17, 2011

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