Aristocrat loud grinding noise, homemade replacement part

[gwslotting]

Update to original post Aristocrat Atlas-Esprit Multiple questions[size=78%]


Before the machine was fired up for the first time, I had accidentally turned the reels by hand. Do not know if that caused  the problems below:


After power on,  MPU went through self check. Lights turned on. Motor does it "home" turn. But makes loud grinding noise before it stops. In play mode and Service 1 mode (door opened), it seems to run fine, and I get the same 3 "fruit" win combination a few times, and hopper pays out coins.  But each time there is the loud grinding noise when the reels stop spinning.


According to the manual, during service 1 (open door) or play mode, the motor starts the camshaft to turn, the cams reset the stopper arm, stops each reel one at a time. After all reels are stopped, the motor continues to turn until one cam at the end of the camshaft hits the "home" microswitch, stopping the motor.  The loud grinding noise has something to do with the brake process to stopping these wheels. There is no loud grinding noise when the reels are spinning.




Examining the cam shaft,  I found the "home" motor off micro switch linkage arm has completely cracked. See photo.  I don't have means to weld it back, as it is so small.  So I fabricate the entire linkage arm from scratch using slighly thicker steel plate. But the same sympton still there.  Could my hand turning the reels (not forcefully) caused reels out of alignment


Could this be related to the MPU EPROMS or other chips?
I have not done any Service Mode 2 Photo Optics Alignment, for fear of starting another can of worms.


Photo shows home-made linkage in contact with cam at the cam nose (toe), stopping the motor. But manual does not say at what point this contact should be made, right at the nose (toe) or how far before getting to the nose.


If of value of other members, I can make a Youtube video, then put a private link address to you can hear it.


I appreciate any help













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[gwslotting]

Update:  The entire unit finally works, the grinding noise has disappeared. I took time to fine tune the two long motor mount screws.They compressed the braking dog, spring and linkages. (see photot) When too tight, there were frequent "tilt". Not tight enough the grinding nosie returned. I adjusted the screws one quarter turn at a time. But only short lived.!!    I played for about two hours with no issues. Next morning on power up the noise returned.


I took apart again the motor mount again but did not dismantle the cork brake pad. And I could not eliminate the grinding noise again. Possible causes (see photo)


1. Cork braking pad got grease and dirt on it again. The motor assembly was previously oiled by the seller, and added too much oil. 2. the springs holding the nylon brake dog was stressed and deformed
3. The nylon dog (see arrow in photo), only half of it was in contact with the brake stop wheel , suppose to be 100% in contact. This will cause premature wear to the nylon dog. The spring itself was pushing the dog half way out, away from the nylon brake stop wheel.  An examination of the hopper motor, same motor and brake setup, shows 100% contact.
4. Too much play when pushing the motor shaft in and out of the motor mount. Should be only 1.5mm.


All the above are just wild guess, still cannot explain where the grinding noise come from !


Could it  be caused by a glitch in the EPROM codes that caused timing to be off?  But everything works fine and payout all works