Help! My 9090db just turned off while it was playing.
- Thread starter LilKaren
- Start date
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Welcome to AK!!
You may want to have this post moved to the Sansui forum. (See below). You’re in the Sansui Database now and you won’t get much action here.
First, do you have any experience with equipment repair?
Second, is your power light or protection light on.
Third, have you checked the fuses?
You may want to have this post moved to the Sansui forum. (See below). You’re in the Sansui Database now and you won’t get much action here.
First, do you have any experience with equipment repair?
Second, is your power light or protection light on.
Third, have you checked the fuses?
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When you feel up to it you could hook something into the auxiliary input and see if that works. If the aux doesn't work do you have another amp and preamp that you could hook up (after removing the jumpers) to it to see if it's in the amp section or the preamp section? That might narrow it down a bit.
Sorry to hear about your shoulder injury. Rotator cuff?
Now that this thread has been moved to the "Exclusively Sansui" forum, you should receive much more responses.
Follow @Mwdan good advice. Also, using a meter check your internal fuses to see if any have blown.
The first thing to check is the power supply for the tuner. It's a common failure point. It's the little board on the far left side of tuner assembly. It generates a lot of heat. Measure the DC voltage between pin one and chassis ground. Should be around 12.5 volts DC.
- Pete
- Pete
Yes, rotator cuff, and bicep tendon relocate. It's no fun this recovery but if all goes well it will be better in the long run.
Thank you!
Also. Yes, getting more replies. I'll take as much help as possible. Once I'm ready to move that beast, I'll get into it.
It's driving me kinda crazy just staring at it, unable to work on it: )
Many experts here on 9090db repair, LBPete is one of them.
Thank you! I'll get to as soon as I can. I'm recovering from shoulder
surgety so won't be able to do anything right now. I am just getting as much information as I can for when I'm ready to go.
Thanks again!
I had same surgery done in November (I also had a frozen shoulder). The recovery is baby steps but every few weeks you realize "I just did something I couldn't do before".
Go for as much PT as possible and do the exercises they prescribe at home. Soon you'll be able to reach for the sky!
Ok, I got the receiver down from the shelf and opened it up. The power supply for the tuner is good. All fuses are okay. I tested the resistors on the F-2624 board and there are four bad ones. From what I have read, this may be the culprit. The bad ones were R33, R34, R41, and R42. Does anyone know if I am headed in the right direction? Also, can you please point me to where the best place to purchase parts are? Should I replace all of them since I'm in there?
Thanks for any help!
Thanks for any help!
I regularly purchase from DigiKey. Mouser is also a good choice.
Replace the bad resistors first and see if your issue has been resolved. If so, then you can continue. If not, then continue troubleshooting.
There is a thermostatic switch mounted on the main heat sink and connected to the protection board. It is normally open [I think] and kicks in around 150 degrees C. If the unit is running hot enough it will throw the unit into protection. When the unit cools down it will allow the protection board to "go green" again [if it is working properly]. You can test it with a VOM and heat gun which I always do on rebuild. Monitor the heat sink temps and verify the thermostatic switch is working OK. If the unit is running hot then troubleshoot to find out why.
It never went into protection mode. The light never did turn red. It just stopped all audio. The power stayed on, light stayed green, just suddenly no sound. When I power it on now, it starts as normal. Clicks, then the green light turns on. All lights are on. There is zero meter activity from the power meter, or speakers.
Thanks for your reply, I'm waiting for some resistors that were bad on the main power board. I'll be trying one thing at a time and hope to find the problem.
Before getting too deep replacing random parts, lets check some basics. Have you checked the fuses on the power supply board? Also check R30 and R31. They sometimes go open and that shuts off the power to the amp. Do all the checks with the unit on using an AC voltmeter. Look to see that you have the same voltage on both sides of the fuses and the resistors.
- Pete
- Pete
Hi Pete,
The fuses on the power board are all good. The R30 & R31 are the resistors that I'm waiting for as they were both bad.
Thank you for the follow up.
Karen