Having issue with my 1952 AMI e-120 jukebox. The cam switch for gripper assembly needs to be replaced as arm won't return when record completes playing. Can it be replaced without soldering it?

Is the positioning off on the tone arm?

Sounds like tone arm is not swiping away soon enough before record lifts off. This could be a adjustment screw at the base of the tone arm linked to a spring. Same with C gripper

Did the circuit breaker blow for the mechanism? The 454 might still use fuses in the circuit so check the mech fuse if that is the case. If blown then most likely you need to have the gripper motor looked at and the mech completely lubed. If the fuse(or breaker) is not blown then you have a micro switch problem on the cam arm. Open the back door( push down the spring clips from the inside) and you will see the micro switches, they rarely go bad but it does happen.

1) Check all of the fuses in the power supply chassis.: 3x 3A, 1x 1A, 1x 1.6A ..(the power cord from the wall goes right to this chassis)

2) If all fuses are good, make sure that the Gripper has completed its cycle. The magazine wont run until the gripper arm is back in place and completely open.

3) There are several switches that ride on a cam at the rear of the of the mechanism.( end of shaft that moves the gripper) These switches tell it where the gripper is (in it's cycle) If they fail to report a completed cycle, it will not scan the magazine.Tapping lightly will sometimes get them working enough to let you know that you have found the problem.

4) It is possible that something is mechanically stuck, use the nub on the back of the (record carriage and gripper) motors, to see it they are free.

5) If it is still dead, you may have a power supply problem. The voltage at the motor(s) plug(s) can be checked with a volt meter, BUT this is not super reliable, because the voltage could have a lot of ripple or could drop to nothing when a load is applied. The capacitor and selenium rectifier under the power supply chassis should be changed for reliability reasons anyway.

5a) A regular 2 or 4 amp bridge rectifier (Radio Shack) will work in place of the selenium rectifier.
When installing it, just connect the 2 transformer leads to the (~AC) leads of the bridge.
The original rectifier should have a red mark or paint on it, near one of it's leads...THAT IS THE PLUS (+) hook that lead to the (+) on the new bridge. (EVEN IF IT LOOKS LOOKS IT GOES TO THE CHASSIS OR GROUND)
The remaining wire connects to the only remaining lead on the new bridge.

5b) The capacitor can be a little higher in voltage and micro farads, just be sure to observe the polarity. (+ & -)

5c) Make sure that you clean and inspect the small relay. This must open and close the contacts correctly.
.
6) It is possible that you have a bad motor, even it it turns freely. There are 2 brushes on these motors, and if one gets too short, the motor will not run no matter what. There may be a dead spot in the armature which would cause it to stop in mid cycle. I have seen gripper motors stop prematurely, right near the end of the cycle. If you help it a little with the nub on the back of the motor, it would then scan to the next record. Sometime this will happen due to a cam switch problem, so check this before you condemn the motor.

7) There is a metal box on the underside of the record mechanism It is near the front, behind the play counter wheel. There are relays in there that often need to be cleaned. They will keep some motors from running, but this is usually when selecting or reading out, but might be worth a look, as I do not have the schematic for this machine in front of me.

With in 100 miles of Lancaster PA? give me a call if you would like me to do a reasonably priced service call. (717)333-6933

Let the music play,
Ed

Yes

Hi Tim,
Do you have the manual? If you do check the adjustments on the gripper bow and the gearing adjustments whilst in transfer.
If you have greased the cam or trunion gears then remove any trace of lubrication from the gripper bow assembly other than putting some high melting point grease in the trunion casting pivot points.
Also check on the gripper bow (transfer arm & hub assembly) this plastic moulding that goes through the trunion has two flanges on it that guide the toggle pins to help turn the gripper bow staight before it goes back into the basket.
I hope this helps.

Regards
Alan
Alan Hood
ami-man
UK

Dave - I have the same problem, how do you replace the trip switch? I got the part, but it appears it needs to be soldered?

It won't reject because it needs to have the gripper arm complete the motion before the microswitches on the cam are in the right position.
It has either seized up or blown a fuse or both.

Hello J.P.,

You need to get the manual for this jukebox.
You have to however confirm what the manufacturer and the model number of this is. The One More Time was made by the following manufacturers:-
Wurlizer, Rowe Ami, Rock Ola, Antique Apperatus and Sound Leisure.
Look for a serial plate on the back of the jukebox in order to get any information.
You can get manuals in the USA from www.victoryglass.com

Regards
Alan Hood
ami-man
UK

At the far side of the white nylon gears at the base of the gripper arm is a small white 'duck bill' bracket, which clicks a microswitch when the gripper is over the carousel. When it breaks or comes loose it fails to click the microswitch and the arm doesnt stop.

Dave F.