Rock-Ola 424 Cam Switch Adjustment

[frank]

Hello All
I have tried tirelessly adjusting cam switch 2
With one adjustment the hammer switch cancels the selection but the tonearm does not contact the record until i manually press the microswitch cam arm .
Then it completes the cycle and record plays.
The opposite occurs if i adjust the microswitch brindle screw .
The tone arm goes down and tge cycle completes but does not cancel the selector switch.
I am really at a loss.
Working on this for over two months.
Is tgere something else i should be considering?
Thanks
Frank

[frank]

This is actually a 424
Sorry I didnt mention that
Frank

[jukenorman]

Are you struggling with the original switch or have you replaced it? Maybe a new switch is required?

Norman.

[frank]

Hi Norman
I would love to replace these 3 switches but have no idea how to get them
The ones i have are all original.
If you have that info that would be great
Thanks
Frank

[jukenorman]

The switches are still readily available. You should be able to get them from either a supplier of electrical goods like Mouser (which I think is worldwide, since we don't know where you are located!) or from somewhere supplying jukebox spares.

Norman.

[frank]

Thanks Norman
I am working on getting new switches now
How do I ask Shrimpeater if he got his cam switches problem solved?
Thanks
Frank

[jukeboxmarty]

The last time Shrimpeater visited the forum was on August 14th.

You can always try to send a Private Message.

[frank]

I have had a similar problem adjusting the micro switches
I replaced #2 with no change to the function
My issue is - one adjustment of the bristol #2 screw the tone arm will not sit on the record, the other slight adjustment of the screw the opposite direction the tone arm sits but will not hammer the reset tab
Been at this for months
I wonder if the #1 switch has anything to do with this
Have not adjusted this one

[jukenorman]

Something is not right here Frank! I doubt it will be the #1 micro switch because that is what electrically disconnects the magazine motor (which has just been dynamically braked). When the #2 micro switch operates, the transfer motor slowing resistor should be enabled and the reset of the selection pin should happen. The transfer motor should continue to run (slowly) until #3 micro switch is operated.

Might the slowing resistor be open circuit?

Norman.

[frank]

Hi Norman
The 15 ohm 5 watt resistor in the control box is open
What function does that actually perform?
This may be the problem
Thanks
Frank

[jukeboxmarty]

The slowing resistor connects in series with the gripper motor. It serves to slow down the motor near the end of it's travel to prevent the tonearm from crashing down onto the record.

If the resistor is open and the switches are adjusted correctly, the motor will stop before the tonearm reaches the record.

[jukenorman]

There will be a eureka moment when you replace that resistor!

Norman.

[frank]

EUREKA!
I couldnt stop smiling for a week
I have been working on that throughout the summer

Finally I cut the wire to the 15 ohm 5 watt resistor and measured
OPEN!
When I took it out it fell apart in my hands
Juke works perfectly and cancels the pins
Put in a new needle. Its great - top right speaker not working but hard to notice. Any suggestions?
THANKS NORMAN

[jukenorman]

There's a capacitor and resistor in the circuit to the upper speakers (only higher frequencies go there) and of course it might be the speaker itself that's failed.

Norman.

[frank]

Hi Norman
Is the cap and resistor in the volume control box that contains the volume and bass and treble
I will have to cut each wire to test , correct
Also , what method do you recommend to test the caps?
Thanks
Frank