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Yamaha cr 1040
Yamaha cr 1040
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Old 28th December 2013, 03:29 PM   #1
Audi2014 is offline Audi2014  United States
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Default Yamaha cr 1040

Hello all,
I am in the process of troubleshooting this receiver.Have found some bad parts and in the process of replacing them.I have a question concerning how can i troubleshoot to find out if the problem came down stream causing the components to fail.With parts missing, is there anyway I can check downstream?
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Old 28th December 2013, 07:45 PM   #2
Welcome is offline Welcome  France
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Check the pre-driver STK module. It is a very common cause of failure in this model. Sadly, if it's dead - which is likely - the amp is not repairable.
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Old 28th December 2013, 08:15 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Location: The Jurassic Coast, England. GB
The driver ic is still available.
IG02930【 Datasheet 】, IG02930【 Price 】, IG02930【 Supplier 】, IG02930【 PDF 】, IG02930【 Stock 】, IG02930【 Purchase 】, IG02930【 Datenblatt 】
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
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Old 10th January 2014, 01:53 AM   #4
chazix is offline chazix
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Yamaha cr 1040
Hi, sorry this isn't more timely, but I'm not a regular here.

It is possible, though maybe not what you'd call easy, to do a health check of the predrivers with the power output packs removed. It involves completing the overall feedback loop around the amplifier by tack-soldering a couple of resistors across certain of the power pack pads. With the loop completed, and the receiver powered with a "dim bulb" rig, you can make some DC voltage checks and even do a listening test at low levels through headphones. If this sounds like something you'd like to try, I'll go find my writeup in another forum and post here.

You might wonder about the complementary situation, testing the power pack with the predriver removed. I don't think it's possible to do an adequate "positive" test in this case. That is, I don't think it's possible to declare a power pack healthy based on such testing.

Regarding predriver availability:

I would be very, very surprised if one could actually obtain genuine IG02930s, despite the hints that you can find at sites like hkinventory.

I can offer hand-built and tested reproduction modules that are a drop-in replacement for IG02930 (and would also replace the predrivers from CR-840 and CR-640). It's not really a commercial enterprise, and I don't want this post to be a commercial, so if anyone is interested in a repro, please PM me.

Good luck!

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