Rowe R74 Jukebox Rebuild

Thank you gentlemen.

the Stylus (which I am guessing is the needle itself) ???

is brand new, this one I have mounted is the cheap Amazon $10 one, I also purchased the recommended $40 one that I am saving for when the jukebox is up and running correctly.

Regarding the broken cable holder, I just broke the little metal clip that is pressed into the post.

Thank you.

Tony,
You can use a drop of "super glue"(aka "krazy glue"), either to hold the clip, or the wires directly--that will be no problem--
Ron Rich

That's a great idea Ron going to check Lowes over the weekend for clips but as a last resort Super glue (or a hot glue gun for flexibility) is something I had not considered.

Received my two brand new beautiful relays but they seem to make no difference operation wise, looks like I'm going to have to dive into those diagrams and determining what makes what do what.

Wish me luck guys, getting in over my head.

Kindest Regards

Tony

Tony,
This looks to me to be what you are looking for ? eBay Item: 310848173420
Ron Rich

Thank you, just purchased the last 2 and will keep em handy in case my mouse wiring doesn't work,

Netcat wrote:That's a great idea Ron going to check Lowes over the weekend for clips but as a last resort Super glue (or a hot glue gun for flexibility) is something I had not considered.
Received my two brand new beautiful relays but they seem to make no difference operation wise, looks like I'm going to have to dive into those diagrams and determining what makes what do what.
Wish me luck guys, getting in over my head.
Kindest Regards
Tony

Ok, so let's check the status of things:

When you establish credit: Does the latchbar pull-in and cause the first key to stay in while till the second is pushed?

When the second key is pressed do the search unit wipers rotate and after a few seconds does a pin get punched out on the front of the pin memory? Concurrent with a pin punch the magazine should start to rotate -does it? Does the stopping switch find the pin -or hop over it?

If the above does not occur:
Does the magazine rotate when you manually lift the scan gear to release it (white nylon gear).
Does the mech stop at a pin if you manually push it outwards and lift the scan gear?

All above require service sw in "normal" position.

Rob

Hi Tony,

Follow Rob's normal fault finding techniques associated with 1100 mechanism and you will not go far wrong.

Regards
Alan

Alan Hood
ami-man
UK

If I press the credit button, I can depress the first and second button corresponding to letters and numbers they will stay in but have no effect whatsoever on the mechanism .. (ever since I've owned the jukebox)

I did check the fuse in the upper portion of the jukebox and its ok.

the only way I get any action is by Squeezing the old Relays (since the casings are broken I suspect when I do this I am manually pushing the relay contacts into action and making the mechanism do whatever that relay is designed to prompt into action), with the new relays (Intact casings) I can get no action whatsoever.

I am attempting to the best of my ability to read through the entire troubleshooting section and locate the diverse components that need to be checked but my manual and diagrams are blurry scanned copies, without mentioning I wouldn't have the faintest idea how to test properly half of these components.

I am also attempting to procure the aid of a friend locally whom is considerably more versed in electronics than myself.

On the plus side.. did find a nut clip at LOWES that fits the record player arm beautifully. and helps conceal and keep the wires in proper position.

f I press the credit button, I can depress the first and second button corresponding to letters and numbers they will stay in but have no effect whatsoever on the mechanism .. (ever since I've owned the jukebox)

Is the search motor -itself- turning? These have two small belts that connect the motor to the first driven gear. the belts inevitably sag and the motor (silently) but nothing else happens. That is the first thing to check here. If the motor doesn't drive the search unit, it won't punch the pin-won't deduct credit-won't release the latchbar-won't start to scan. Belts are cheap and readily available.

FYI: The first few models of Rowe search units used a gear to couple that motor. this produced a growling noise in the sound if a quiet record was playing and the AGC had brought up the gain. The belt driven motor is quieter, however every few years the belts loosen and you get a machine that just sits there. On the two hideaways I have in service, I rebuilt two older, geared search units. These machine only serve speaker wallboxes so the noise isn't noticeable.

BTW: Do you have a test meter (DVM or analog type)?

Rob

will check on belts tonight.

Yes have several multimeters both analog and digital

VERY EXCITING NEWS

After Reading Rob’s latest input I proceeded to press the selection buttons and immediately noticed a humming from one of the motors in the front of the mechanism, upon unplugging the Long edge connector and reconnecting it ceased humming (Sign of a stuck motor???), if I depressed a couple more buttons it started again, after feeling around a bit I found a small rubber belt that I manually spun around a couple times this obviously released something that was seized up.

Now when I press buttons the gears spin for a second and seem to lock into place at this point the belt can no longer be spun manually so I am assuming it is by design although sadly nothing else is happening at this stage it is Extremely exciting for me to see some real action from the search gears since I’ve had the machine.

I can still coax a record into playing if I fiddle with one of the relays in the correct order (Note this will only work with the older relays)

Attaching a small video 3 Minutes 23 seconds, if you guys could please see the whole thing I added notes to illustrate were I currently stand and what I am able to make the mechanism do.

MAIN VIDEO
https://www.youtube.com/watch?v=lamAuypsEZo&feature=youtu.be

Close-up of record player selection mechanism:
https://www.youtube.com/watch?v=dZxDYqC ... e=youtu.be

Another interesting side effect to un-ceasing the motor can be seen here:
https://www.youtube.com/watch?v=apDnXGe608g

Progress so far
• Gained access to Jukebox after pervious owner drilled out locks and it latched itself closed
• Removed record mechanism and thoroughly cleaned out case
• Blew out mechanism with compressor and sprayed down with contact cleaner
• Rebuilt Tone arm completely including wiring counterweight and new needle
• Checked for blown fuses and breakers
• Replaced Relays
• Un seized motor from record selection mechanism

QUESTION OF THE DAY

Last night removed CAM Switch plate and individually removed, cleaned, tested for continuity (in both positions) and remounted all 5 CAM Switches.

My question is concerning CAM SWTCH #3, which in the diagram of the original R74 Manual is depicted as mounted one way and on my machine it is mounted upside down, there is a slight possibility I mounted it backwards but I'm 99% sure I didn't, by having it mounted in a different position it seems to me the switch would be activated at a different position when the CAM wheel rotates.

Please see attached comparison photo (LEFT PHOTO IN COLOR IS MINE AFTER I FINISHED)



Is it possible there was a revision to the mounting positions of these switches or did I simply mount it upside down ?

Comments ?

Ton
I am GUESSING here--I GUESS that you have turned it upside down--and yes, of course, that will make a difference in where it activates ! As for "checking Micro Switches", how did you do it (see above sticky). Ron Rich

No Comment regarding my previous post (AND VIDEOS) ?

TESTING MICROSWITCHES

Multimeter in continuity setting. (BEEPES when there is continuity, doesn't when there's not)

IMHO, That's NOT a valid test for switches !! Ron Rich