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Author Topic: Looking for someone to repair 504 b board  (Read 938 times)

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Offline slots4home

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Looking for someone to repair 504 b board
« on: December 21, 2020, 07:19:08 PM »
I have a very clean 504 b board that has a reel 3 error code.
Looking for someone who does repairs.
No battery damage
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Offline Stayouttadabunker

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Re: Looking for someone to repair 504 b board
« Reply #1 on: December 21, 2020, 08:48:49 PM »
You might be able to fix it yourself S4H?

Here are two photos of two different boards.
The 1st one is a 502 MPU and you can see the 5 reel resistors and drivers.
The 2nd photo is a 504 MPU and the reel driver area.
There's not a lot of of difference BUT you can clearly see the blue resistors on the 504 MPU at locations
 R720 (Reel 1), R721 (Reel 2), and R722 (Reel 3) throwing out heat onto the circuit board. towards the left side of the resistors.
This is EXACTLY what happens to the 1st three resistors on an S+ MPU.

You can unsolder the light blue R274 (Reel 5) resistor and solder it to location R270 (Reel 1) after removing the resistor.
But since your problematic reel is #3...change THAT one instead.
Sometimes I just take parts off an acid-ridden junky board if the component isn't too bad and use those.

If changing out the reel resistor doesn't fix it, then you will have to change out the reel drivers which are right next to the resistors at locations Q700, Q702, and Q704...especially Q704 (Reel 3)
These ones are really transistors that switch power on and off to the reels....they overheat & short out inside sometimes.

Below are the two photos of the reel driver areas on the 502 and 504 .
Click on any photo to enlarge if needed...>>>>

« Last Edit: December 21, 2020, 11:47:32 PM by Stayouttadabunker »
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Offline slots4home

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Re: Looking for someone to repair 504 b board
« Reply #2 on: December 21, 2020, 09:14:01 PM »
Wow thanks for the information.
I do not feel qualified to tackle it and one of the members here is going to fix it for me.
Also I am sure I would screw it up.
Thanks Mark for the information, I really appreciate it.
I am sure some of the members here would like this information.
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Offline slots4home

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Re: Looking for someone to repair 504 b board
« Reply #3 on: January 01, 2021, 10:50:04 AM »
Wanted to let everyone know that John aka look electronics was able to fix my clean 504 board.
I would recommend him highly.
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Offline therockinelvis

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Re: Looking for someone to repair 504 b board
« Reply #4 on: January 01, 2021, 05:01:48 PM »

What is the cost of repair?

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Offline slots4home

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Re: Looking for someone to repair 504 b board
« Reply #5 on: January 01, 2021, 05:17:26 PM »
He only charged me shipping because it was a minor fix
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Offline therockinelvis

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Re: Looking for someone to repair 504 b board
« Reply #6 on: January 01, 2021, 06:07:56 PM »
Was it acid damage?
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the rockin elvis

Offline slots4home

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Re: Looking for someone to repair 504 b board
« Reply #7 on: January 01, 2021, 06:28:29 PM »
No mine was not acid damage
Pm him and let him know what you got
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Offline mvco

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Re: Looking for someone to repair 504 b board
« Reply #8 on: January 02, 2021, 09:26:01 AM »
John is a beyond awesome guy! Fixed a bunch of my bad boards. these 504B's are worth saving. Hi has the most awesome test jig I have ever seen. Highly recommend him for board repair.

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Offline slots4home

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Re: Looking for someone to repair 504 b board
« Reply #9 on: February 09, 2021, 05:39:43 PM »
Just had another board repaired by John Schulz with Looks Electronics
He does a great job repairing the 504 boards
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