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Post by paulg65 on Jul 26, 2024 11:20:42 GMT
Hi all!
I got a wonderful jukebox this past Saturday. Here's what I found once it hit the homestead:
1. The Selector Harness Edge Connector going to the Search Unit has a burned/melted spot that includes wires 26-30. [See Video]
2. The Tone Arm strikes and hops over a black rubber wedge on the Gripper Arm before making contact with the 45. This was tested manually with an allen wrench
with the Record Changer Mechanism taken out of the cabinet. [See Video]
3. I have to jiggle the Lower Knob of the Pricing Switch between 4 and 5 to get the letters and numbers to engage. The carousel rotates to the correct selection, but the record does not get selected and placed on the turntable.
I fail one of Rich's (R.I.P.) criteria for being here - I cannot read a wire schematic to save my life. I don't know how to find the cause of the melted edge.
Any information/guidance is gratefully appreciated. There are no service people close to me.
Paul
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Post by jukenorman on Jul 27, 2024 9:10:15 GMT
Hi Paul,
That search unit connector looks very poorly, I think you should make repair/replacement of that item a priority and I also think that you shouldn't be running the jukebox with it connected while it's in that condition. I suspect that it will be the cause of most of your problems. The manual would suggest that it's pins 1-4 that are burnt and not 26-30 as you indicate (ie the manual drawing shows pin 1 at the extension stub end). It's not possible to see the colour(s) of the wire on pin 1 (or 30?) because of the burning, can you trace it into the loom and confirm the colour(s)?
You are correct, the phono cartridge should not foul the gripper arm. The original cartridge was a Shure M44 but the fixing lugs were partly cut away to allow it to sit further into the tone arm. It looks like it might be an M44 in yours but maybe a stock replacement?
Norman.
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Post by paulg65 on Jul 27, 2024 12:13:04 GMT
Hi Norman,
I actually ordered the connector about 9 hours ago, and I'm expecting a new power cord in today. The original was cut in 3 or 4 spots; the wire insulation crumbled in my hands while I replaced the plug!
Okay, the wire colors are (from the first position): Yellow/Brown, Red/Black, Yellow/Green, Orange/Brown, and Black. The "underside" of the connector shows number 30 at the top of the burn, while the front side has the numbers 1 and 30 stamped on the opposite ends, per your description. How does one remove wires/contacts from the connector?
Regarding the needle and cartridge: the tip of the needle is not facing down to the record! Looks like someone folded the needle the wrong way. I remember home record players having needles on both sides, I think one side was for 78rpm only. I imagine that's not the case for a jukebox? 
I'm ordering a needle and cartridge shortly --
Paul
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Post by jukenorman on Jul 27, 2024 15:02:04 GMT
Yellow/Brown is pin 1. You shouldn't need a new cartridge (just a stylus), especially if it's an M44. Off the top of my head, I don't remember how the contacts come out and I haven't got one to look at. I'm not sure if there is a barb like a Molex? The parts list just says "connector". Maybe somebody else might remember? What exactly have you ordered, connector wise?
Norman.
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Post by paulg65 on Jul 27, 2024 16:40:15 GMT
The connector is an exact match to mine, except it has no hardware, just empty spaces.
The cartridge is a Shure model, so I need to work out why it is fouling the gripper arm. Any thoughts?
Paul
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Post by paulg65 on Jul 27, 2024 16:54:24 GMT
Never mind about the tone arm. I have the MM-1 manual. It shows the adjustment needed.
Paul
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Post by jukenorman on Jul 27, 2024 19:30:29 GMT
I was hoping you were going to say that you had bought a connector with trailing leads, in which case you could have spliced the wires! The burnt connector contacts will not be useable - they have been the cause of the burning!
Depending on which version of Shure cartridge is installed, you might be able to get adjustment but either way that is not an unsurmountable problem - the least of your worries lol!
Norman.
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Post by paulg65 on Jul 28, 2024 1:18:03 GMT
Man, the only correct connector I could find was that one! But I'll continue to search for another with those wires! Fingers crossed.
Paul
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Post by jukenorman on Jul 28, 2024 11:38:39 GMT
I looked at a well butchered JAL button bank that I have lying around. It has a 0.156" pitch printed circuit board edge connector, you could check whether yours is the same (I'm fairly sure it will be)? Is the circuit board on the search unit OK where the connector has fried?
Norman.
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Post by paulg65 on Jul 28, 2024 14:25:23 GMT
I bought a replacement circuit board, using the "change the spark plugs, also change the wires" philosophy! But I probably don't have to replace the existing board at this point. To all appearances, the circuit board looks fine. I don't understand what to look for on the edge connector. What info would you like?
Paul
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Post by jukenorman on Jul 28, 2024 15:53:49 GMT
I just wondered if the circuit board also had scorch marks? The fact that it doesn't is actually good news because it likely shows that the burning of the plastic on the connector is due to arcing at the contacts as opposed to over-current caused by a fault elsewhere.
Norman.
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Post by paulg65 on Jul 28, 2024 19:41:42 GMT
It has a 0.156" pitch printed circuit board edge connector, Norman, Do you have a wired edge connector?? |
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Post by jukenorman on Jul 29, 2024 8:55:48 GMT
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Post by paulg65 on Jul 30, 2024 5:11:36 GMT
GREAT news, Norman! I found the complete harness assembly (wired connector included). I'll put the replacement board in and the harness assembly.
I want to thank you for your guidance and help. I'll post a video when all is working.
Cheers,
Paul
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