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Author Topic: Nsm City 2 - the journey and rebirth  (Read 871 times)

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Legtod2

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Nsm City 2 - the journey and rebirth
« on: April 15, 2017, 07:49:51 am »
Sharing my journey of restoring a Nsm City 2 jukebox.

I began my journey finding the unit sitting dead at my brothers place.
My brother fixes and restores seeburgs, wirlitzers, ami, etc from the tube era.

This unit was not getting the love and attention it needed, someone needed to bring it back to a working state.

My last jukebox was a seeburg LS1 and unfortunately I sold it when I had a temporary moment of bad judgement.
Missed it and rebuilt several mame machines, virtual pinball machines, pi jukebox radios.

Now that I have the nsm I really want to restore and improve upon it.

First I'll get the unit working and playing, then add remote capability.

The City 2 and 1946 Philco radio sit side by side.
« Last Edit: April 17, 2017, 05:59:11 am by Legtod2 »

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #1 on: April 16, 2017, 07:55:06 am »
So what are the problems with this unit ?
Carriage will not track left and right when music selected.
No sound if record manully mounted.
Needs a good cleaning
Base speakers look to be in bad shape
Some rust on bottom speaker grills
Gas props that hold up doors not working, using a broom handle to hold open lid
Missing back art work
Burnt out bulbs in control panel
Credit segment display very weak.
Minor scratch on glass
Gas prop rods that hold up door
« Last Edit: April 17, 2017, 05:58:09 am by Legtod2 »

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #2 on: April 16, 2017, 08:12:18 am »
Carriage will not track left and right when music selected...

The solenoid on the carriage unit was stuck. The pin would not move at all.
I did not have a replacement part so I forced the pin out of the solenoid, used a drill bit to oversize the plastic sleeve by a thousands of an inch and now the pin slides without issues.

Put everthing back together and tested firing the solenoid from the relay. That worked fine.
Wham bam thank you mam, the carriage now tracks left and right.

The tracking one direction is really slow in one direction, and regular in the other direction.

Over multiple testing cycles the carriage is not always recognizing it is in rest position or starting position located at the far right of the track. Not sure if this is an optio issue or not. Add optio checkup to the list.
« Last Edit: April 17, 2017, 06:05:38 am by Legtod2 »

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #3 on: April 16, 2017, 08:23:41 am »
No sound...
Now that the carriage is tracking left and right lets try to select a sound and listen to some tune.

Oh boy the carriage tracks to the 3 digit selection and the 7 segment display show the tracking with each selection as the carriage moves. Thats good news the optio is working ..

The carriage stops and it loads the correct record. The motor spins and so does the record.
No sound...

I check out the amp and volume controls. Try to turn up volume and pots to get sound. Nothing.
Checking the schematic I see the 4 pin volume wires are connect to the wrong place on the board.
Connect them up.... still no sound.

Scratch my head for a while.   Hmm, what will happen if I switch from stereo to mono (switch on main board).

We have sound !!!!!!!

Now I am listening to records but volume is a bit low for a 700 watt system. I want the windows to rattle when I crank this beastie.  Amp rebuild on the check list.

After several testing cycles I see the sound is only coming from the left base speak and top left speaker.
« Last Edit: April 17, 2017, 06:08:29 am by Legtod2 »

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #4 on: April 16, 2017, 09:17:46 am »
Brainstorming... what do I really what this thing to do.

I have seen a could of examples whereby jukebox have been hacked to enable mp3 music capabilities.
In some cases the interior of the box is gutted and replaced with a ipod with some fancy controls on the outside.

I want to retain all the charm of the original controls and playing the records with the traditional controls.
I also want internet radio and mp3 songs to stream thru the jukebox amp. Plus I want my ipad or phone to control it.

Already did this with my 1946 radio, now Do it again with the juke box.

Question is how to do it?
So one method is to hook into the optional wall box controls of the jukebox. Control volume, record cancel, on off, record selection, a/b toggle between mp3 feed to amplifier from jukebox and alternative music feed.
A raspberry pi could provide a web service to the ipad to act as an external wall box control system.

Method two is Replace all controls and displays with my own version of new 7 segment displays and touch screens.
If I go touch screen, I will drop the present buttons and 7 seg display all together. Should I go this direction, the machine will lose some of its present character. A web interface is a must plus streaming to bluetooth speakers placed outside or in different rooms in the house. The pi will be used for this.

Decisions decisions.

Will post pictures and youtube of radio and jukebox in action.
« Last Edit: April 16, 2017, 09:20:36 am by Legtod2 »

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Re: Nsm City 2 - the journey and rebirth
« Reply #5 on: April 17, 2017, 06:20:00 am »
Cleaning...
Uggghh. Scrub brush, and tooth bush to clean the exterior black plastic.
The top speaker covers were caked with years of gunk. The bottom speaker grill will need black paint.
Windex to the glass and new sparkle was found. Used automotive dashboard cleaner to add shine to the black plastic works.

Cleaning the 45 rpm records all 80 of them. Yup the records had dust and other foreign particles.
Cleaned them with a kit from Crosley Vinyl cleaner. Basically its a plastic tube with a micro fiber cloth and gentle pads inside which clean the record surface. Just add water and the scoops of the gentle cleaning solution.
Insert the record in and rotate the record 3 times in each direction. Then wipe dry with micro fiber cloth.

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #6 on: April 17, 2017, 05:57:28 pm »
Burnt out bulbs...
There are 6 12volt bulbs located in the control panel.
Found replacement bulbs at princess auto.
They are #194 12 volts. There is a small twist cap that the bulbs sit in.
Simple matter of untwist, replace bulb and put them back in place.

Replace gas prop rods...
I found the prop rods at princess auto too. They were 23 inches pin to pin.
They need to have mounting points modified to fit, soo I will hold off installing until after the re caping of the capacitors and amp rebuild.

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #7 on: April 24, 2017, 06:23:05 am »
Spent the weekend reviewing the schematics and building my shopping list for capacitors, resistors, etc.

The control unit has one connector that has nothing plugged into it. Its labeled electronic wallbox.

The schematics I have don' really include this.

Any one have schematics for the nsm city 2 ?

I might be able to use this for my connections to arduino controls

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Re: Nsm City 2 - the journey and rebirth
« Reply #8 on: April 25, 2017, 05:33:19 pm »
No 5volt led light on. No lights to 7 segments display. Guess no power to control unit.

Have the jukebox laying on its back and removed the 8 2inch long screws holding the base wood plate from bottom of cabinet. Now I am checking the transformer inside of the base and checking voltages on transformer
Getting 46.5 vac, 23 vac, 27 vac, and 13.6 vac.
Excpecting 43 vac, 22vac, 26 vac and 12 vac so not far off unit looks good no burn or brown marks.

Since I have the base open I may as well inspect base speakers too.that required 14 more 3inch lag bolts to be removed.

See pictures

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #9 on: May 02, 2017, 07:48:25 pm »
My 5volt led being out was from blown fuse Si2.
Replacing the fuse returned the working control lights on the 7seg displays and the all the control bulbs.
I was able to play two records and the same fuse blew again.

I really need to find the schematics so I can trace the circuit and order the replacement resistors, caps, etc.

Sent an email to nsm usa looking for help, no reply.

They have a recent "we have been sold and ami is new owner, business to continue same as usual"

Guess I'll never hear boo from them.

Tried John from jukebox parts, he has no schematics.

Crap, crap, crap.

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #10 on: May 15, 2017, 08:59:48 pm »
After much searching I found the schematics at radiomuseum.

My fuse blowing issue was from my 12 volt light bulbs on the console.
After I removed the 6 bulbs and ran the jukebox every thing was fine no blown fuses.

Guess I need to order my part to rebuild the board.

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #11 on: May 16, 2017, 06:27:26 pm »
Latest observation. I can add credits to the machine. After the record plays I get an err1 and the credits do not decrease. The unit moves on to play my next selection. Not sure what is causing this

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #12 on: May 16, 2017, 06:50:36 pm »
After I reprogrammed the credit unit the credit issue is now adding and removing credits properly.
Programming requires lifting the lid of the jukebox.
When P is displayed in the 7segment display I pressed 8 to clear all credits the press the finger icon button.
Next close the lid of jukebox and no credits display.
Next add two credits and choose two records to play.
Each record plays and properly reduces credit count one record at a time.

Ok that works okay dookie.

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Re: Nsm City 2 - the journey and rebirth
« Reply #13 on: May 18, 2017, 06:52:47 am »
Had a evening of listening to the jukebox play. Loaded up 23 records and exercised the controls of the machine.
Inserted 25 cent coins for each record selection and monitored behavior of machine.

When this machine starts its scan it begins from the right and scans to the left, displaying digits 179 to 100 on the 7 segment display. When it travels left to right the display counts up from 200 to 279. Of course the enables the selection of the A Or B side of the record to be played.

During the scan from right to left the pace of the carasel is slow. After the record is played and the carasel is tracking to the right again the pace is excellerated. This may be an indicator of a bad resistor, cap or something else.

During the tracking of left to right the pace of the carasel returns to its slow and pokey self. I can only guess why the pace of the carasel varies some much.

The amp is presently switched to mono as opposed to stereo. When I switch to stereo I get no sound.

With just the one sound channel the volume is not up to my expectations. The amp rebuild should cure this.

I guess I should stop fiddling and order my parts and get to rebuilding

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #14 on: May 20, 2017, 07:27:25 am »
This little tidbit maybe helpful to nsm city 2 owners...

7 segment displays Err 1 when jukebox turned on.  What the hell does this mean. ????

According to the manual it means the unit is out of order and programming needs to be checked.

To correct and reprogram...
Lift lid of jukebox and Letter P P appears on display.
Press 8 key and finger icon key.
Lower lid of jukebox and now prices for selection will appear.
Insert some coins and listen to the music.

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #15 on: May 21, 2017, 07:07:58 am »
Tidbit of helpful quarks...

The carasel has a mechanical reverse direction switch. The lever is present on the left side below the grove where the record rotates.
For whatever reason the mechanical sliding lever is not fully engaging when the carasel returns to the home position. I will have to check the mech for other sticking and sliding parts. Maybe all this baby needs is to be exercised till the gunk gets worked out of its system.
The symptom of this problem was this...
Insert coin selection, I heard a hum but carasel was not moving and motor not spinning. I mannually turned motor but it crawled back to its home posistion. Pushing the reverse lever and the machine went on with its normal operation.

Legtod2

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Re: Nsm City 2 - the journey and rebirth
« Reply #16 on: June 17, 2017, 05:19:38 pm »
Taking a short break from my Marconi Radio build so I can install my new capacitors into the amp.

After I inventoried the caps and the schematics, I have all the correct voltages and capacitance per the schematics.

Removed the amp from the chasis then disconnected the large heat sink from the electronics back plane.

Mistake number one, ordered axial instead of radial caps for one of the caps.
Mistake number two the schematics called for 3300 uF and 25volts. The actuall installed on the board was 3300 uF and 35 volts.

Got all the electrolytic caps replaced that I had on hand. Next step I will just check the circuits for any tell tale problems. Goings to shoot some contact cleaner into the sliding stereo/mono switch.

Maybe my fathers day gift will be to having the left and right channels working on the amp and to have the ability to shake the windows when I crank the volume on the amp.

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Re: Nsm City 2 - the journey and rebirth
« Reply #17 on: June 19, 2017, 12:25:27 pm »
All caps done, re assembled amp and installed.

Wires connected ...

No sound ...

Trouble shooting time.

  
 

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