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Post by jukenorman on Mar 21, 2023 9:21:36 GMT
The "hot" circuits for the magazine motor are shown on page 38 of the manual and although that is designated "selection registered" the scan switch just replaces the wobble plate switch to energise the play control relay. Is the transfer arm fully over the magazine? Then you're probably checking out #2 and #1 micro switches next although there are other possible causes.
Norman.
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Post by shrimpeater on Mar 21, 2023 23:39:28 GMT
Tested switches.1 open, 2 & 3 closed.Home switch open(because carraige not homed) Gripper arm in rest position,#1 in cam groove.
I've been reading about the play control relay.I'm going to trpile check it with a voc meter to make sure the contacts are actually making.But,when reading I did realize that moving a selector should also activate this relay. I only hear the relay come on when I put the switch to scan.Also noticed that the play relay operates the turntable ,which is working.
What I can tell from the diagram on page 38 is when the play control relay is activated it should activate the magazine motor relay.
I'll get this figured out one way or another.What would be a big help here is if the circuits or wires were color coded and I could check for continuity with a meter to make sure there were no broken/open wires.
I've never had to do any adjusting in a control box.I'm thinking my issue is still at the player relay,because when I put the box in scan,nothing moves in the control box,which is were the carraige motor control is. So----tracing the "hot" circuits carefully (no power) I've seen contacts that are touching before and not making contact.Hoping that's what this is.I'll know after using a meter.
Thanks
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Post by jukenorman on Mar 22, 2023 14:53:55 GMT
All I would add - and it has been said many times on this forum - is be very aware that testing contacts and switches for continuity with a digital meter can often lead to false positives!
Norman.
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Post by shrimpeater on Mar 25, 2023 18:43:52 GMT
So I push the home switch down to see what it does,and it rotates. I can get it to pick a record,but it doesn't cancel at the end until I move the gripper motor a little by hand using the knure,and then it ejects.
So my thinking now is that the cam switches may be off even though I got switch one in the groove when gripper arm is in resting place and gripper motor moved until it stops (by hand) So at least I got something to focus on now. I was getting worried that i may have to give up on this one as well,but I'm excited that it's actualy moving again.
I do know the home switch should stop the basket when its activated. Strangely the basket doesn't move unless it's activated,Hmmm No doubt I have a switch problem.As I can tell on the manuel,the outter switch should be #1 ?
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Post by jukenorman on Mar 26, 2023 10:47:46 GMT
The home switch, the wobble plate switch and the manual scan switch all perform exactly the same function when the magazine is not in the home position - they energise the play control relay. So something is very wrong there and in my world that would be priority to be repaired before moving on - this means concentrating on a known fault and getting it fixed! Then you can move on to the next issue knowing that what is happening in earlier sequences is as it should be. It also makes answering queries that you might have more straightforward.
Norman.
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Post by shrimpeater on Mar 29, 2023 19:15:30 GMT
I'm at a dead end. If I push down on home switch when it's in operate mode,the magazine turns.(should turn if switch is closed) If I put the machine in scan,it scans.But it doesn't go home when powered up,or after a scan,and it does nothing when I move a selection level. It's crazy that it doesn't scan unless I push down the home switch.If I home the magazine,when I power up,it jumps just enough to get off the switch. I seriously hate to part out a machine that is so close.But the time I'm putting into troubleshooting has become extreme,so I'm about ready to throw in the towel.No big lose money wise. It seems there may be a crossed wire,or even a bad connection.But I checked ,and could find anything apparent.
I can get the gripper to operate if I move the motor with knurl and get it over the turntable.It will reject propely and then the gripper goes back to standby and nothing?
Could all this be related to -28V Seems nothing would work if it wasn't present
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Post by jukenorman on Mar 29, 2023 21:25:07 GMT
First of all, I don't think it's related to the -28V, the motor does run after all! I'm confused about the home switch, is it adjusted correctly as detailed on page 13? If you're pushing down on the home switch to make the contact, then either it's not in adjustment or the the contacts are poor. You need to deal with one fault at a time. After you've dealt with the home switch, you need to turn your attention to the wobble switch. And so on!
If the machine is worth saving, then it's worth persevering. If nothing else, look on it as a learning experience. One fault at a time is a good habit though and don't give up!
Norman.
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Post by shrimpeater on Mar 29, 2023 22:02:02 GMT
I went back reluctantly and checked the output on the 437 I had. -36 vdc output at the rectifier. Checked the output on the 425.Same. So,I "finally" checked the voltage at the input plug at the bottom box.Sorry,don't recall the name,but NO power coming through pink wire on plug.So I have a open wire somewhere in the loom. Good place to look for a cut or broken wire.
So now once I know for sure there is -36 going into the selector box,I'll be able to start "again" looking for a fault. I checked wooble plate switch,changed wooble plate coil.The home switch is very confusing.But I want to start with the carraige going home,whether it stops there or no. If no selections are made,it should go home.
Thank you-Haven't given up yet (I did on the 437)
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Post by jukenorman on Mar 30, 2023 8:28:20 GMT
The DC power splits into two feeds after the rectifier, each one fused. It would be my guess - having read through the complete thread again - that the DC power is OK. Maybe you have subsequently blown the fuse on the write-in side? Can you still make a selection?
Norman.
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Post by shrimpeater on Mar 30, 2023 20:42:11 GMT
Can still make selection. Checked and even changed fuses,no progress. The pink wire did check out today,I'm getting voltage through it.Not sure where to look next.
Thank you
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Post by jukenorman on Mar 30, 2023 21:17:48 GMT
I don't think your jukebox is that far from being operational from what you've written previously so the DC voltages must be OK otherwise a lot more wouldn't function! So - it's back to checking out the home switch followed by the wobble switch.
Norman.
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Post by shrimpeater on Apr 1, 2023 1:11:50 GMT
Thats it. WE got it. I used a jumper to go from the empty home swtich lug to the red? wire on the wobble switch. Everything works normal. I'm not sure if someone put the wire in the wrong place,or it's a broken wire. But I will be moving the connections at the home switch to make sure thy are not in the wrong location.I can always add an extra wire,but I really want to get to the meat of the problem.
This machine is a rescue.It had been in a persons carport,outside,for I don't know how long. I got it for free,just paid to get it picked up,bought a manuel,changed power cord,and that's about it.Now I can make minor adjustments and head to the amplifier.
Thank you
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