1960 Ami K JDK-200, after selection magazine won't turn

1960 Ami K JDK-200, after selection magazine won't turn . After a record is selected the brush arms and pin selector in back turns , stops at a selection then nothing else happens

what should I look for at this point

thanks Gregg

Hi Greg,
If you are saying that the basket quits turning at a selected pin, that is the correct operation, to that point. At that point, the gripper motor should get power, and put the record on the turn table. I would first check that the gripper motor is, or is not getting power ( 25-30 volts) ( I forget if this model has an AC or DC motor--as they changed it somewhere along the line). Either motor is subject to "binding up", especially if not properly oiled---If the motor is not getting power, you will need to trouble shoot , using the schematic.
HTH, Ron Rich

Ron, 'Ransome" the K is AC gripper with a DC relay in a box to control it. The AC grippers no longer reversed. The cam was redesigned for continuous direction so that if a pin was not cancelled quick enough all that would happen is the record would get put back into the magazine and the operation would "try again" -instead of jamming and blowing the DC fuse.

Rob

Ron Rich wrote:Hi Greg,
If you are saying that the basket quits turning at a selected pin, that is the correct operation, to that point. At that point, the gripper motor should get power, and put the record on the turn table. I would first check that the gripper motor is, or is not getting power ( 25-30 volts) ( I forget if this model has an AC or DC motor--as they changed it somewhere along the line). Either motor is subject to "binding up", especially if not properly oiled---If the motor is not getting power, you will need to trouble shoot , using the schematic.
HTH, Ron Rich

The basket doesn't turn at all , the only thing moving is the brush arms , they stop after finding the selection number. The turntable is also spinning.
That's all that is working now

Greg, that model came in three versions, you have either the type where the keyboard generates a series of pulses, or the type which connects the keyboard directly to the search unit.

When you make a selection do you hear a series of rapid pulses, or just a few "clunks" and a small motor running? A look at the keyboard will be instructive.

The direct design is much easier to fix in that it eliminates the entire pulse generator and stepper.

Let us know and we'll try to help you.

Rob-NYC

Greg,
Do you have the service manual for this phono--if so, it is much easier if you use the terms they used--Please purchase one--see the list above of "where to find'----I'm guessing that "brush arms" may be the "arms" in the rear that should push out a pin ? If I am correct, do they actuate,
when the stop at the selected pin ?
Rob,
I know the AC motor runs in the same direction, but it too can "jam" ! I have seen several where they were dry, and the armature remained connected to the gear box, so the motor lacked the power to start. Also saw one where the drive link was so "worn" that it would turn sideways, and bind the motor--
Ron Rich

Here is a video that shows what is going on. Notice that the basket never moves

https://youtu.be/GJfHBPomWCs

thanks Gregg

Hi Greg,
The only thing the video shows is that the pulse generator is operating the pulse converter, which has it's cover laying on the side, doing no good---and that a record is on the TT, but the tone arm is not on the record ? Ron Rich

Hi Greg,
The only thing the video shows is that the pulse generator is operating the pulse converter, which has it's cover laying on the side, doing no good---and that a record is on the TT, but the tone arm is not on the record ? Ron Rich

Ron Rich wrote:Hi Greg,
The only thing the video shows is that the pulse generator is operating the pulse converter, which has it's cover laying on the side, doing no good---and that a record is on the TT, but the tone arm is not on the record ? Ron Rich

That's all it does

What other part of the box would you like to look at

thanks Gregg

Ron, Greg, to get terms cleared up here, on this version there is no 'pulse generator". There is a search unit directly connected to the keyboard.

First thing to check is if the pins on the memory wheel are being punched.
In addition:
-At the same time a pin is punched another coil started the scan assembly (part of the popularity assembly) this in-turn start the turntable motor and also starts the low voltage DC motor the rotates the magazine.

The fact that the t-t is turning means that at least the scan assembly has been started. So, check that the plug on the magazine motor are actually connected. This is a small plug and known to fall out. Check for DC of approx 26 volts at that plug.

Check if the stopping switch assembly is on a pin (at the rear). Some line drawings of that assembly are here
:http://s1192.photobucket.com/user/Rob-NYC/library/AMI-%20I%20200?sort=3&page=1

Check ALL fuses in the power supply. I believe this series still hid one inside the power supply chassis, so remove it to check.
As Ron mentioned the gripper motor can jam so feel it for vibration or heat. It is to the left of the T-T. It is quite possible that the mech has scanned to a pin and then stalled with a failed-jammed gripper motor. those early AC motors were closed gearbox which prevented oiling and frankly, that mech wasn't really well designed for that type of motor.

Let us know what you find.

Rob

+1 to Rob -
It seems as if the switch (or the coil that's supposed to reset the switch) to start the magazine turning isn't firing, so the search unit is firing, but then the magazine isn't turning. Likely, even though the arm is up, it may not be up all the way, so that the transfer cam isn't clearing the proper switches yet (why the turntable's still spinning). The magazine won't scan until the transfer motor's in it's parked position.