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Old 4th Oct 2020, 3:25 am   #1
DerciiDercii
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Default Uher 4000 Report Monitor - Speed Control wiring and gearing?

Hello fellows!

I bought a 4000RM a while ago that had the speed control broken off. I've been able to fabricobble a new gear and shaft as shown here: H5P49Hv.jpg
The issue is, I'm not sure how the switching gear (shown here: OJeuG7t.jpg) should be oriented for the different speeds.

Also, two wires have come loose on the switcher and I don't have a reference of the wiring.

What position should the gear be in and what's the wiring for the switch? Thanks for your time.
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Old 4th Oct 2020, 10:54 am   #2
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

You did very well to make the gear.

The speed control being broken off most likely is due to the machine having the BBC single/fixed speed (7.5ips) modification.

My linked Thread below covers this.

https://www.vintage-radio.net/forum/...d.php?t=167836

I purchased a NOS gear assembly and fitted it and had a bit of a struggle getting it aligned correctly for the 4 speeds.

If it has had the BBC modification then there also is some wiring changes required to go back to normal operation. More on this later.

David
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Old 4th Oct 2020, 11:14 am   #3
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Schematic attached (Hungarian I think).
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File Type: pdf 4000 Report Monitor Schematic.pdf (999.8 KB, 77 views)
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Old 4th Oct 2020, 11:37 am   #4
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Ref Post 10 and other posts in my linked Thread does your unit have the white plastic widget fitted ?

Not a great photo but attached shows the widget in position with the speed control out of the way, it is near top centre with nearly 30 vertical teeth.
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Old 4th Oct 2020, 11:56 am   #5
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

For any required wiring changes first have to establish if the K4 Start switch and K7 Rewind switch are duplicated, i.e. 2 of each, second ones being mounted on top of original switches.
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Old 4th Oct 2020, 9:45 pm   #6
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Thanks for all the replies DMcMahon. Quite a lot to take in!

Yeah, the plastic widget is still there. That's no problem.

How should the roller switch gear (big circled here) be positioned relative to the other gear circled in furthest left position?

Also, how should the switches on the speed assembly be wired? The short red wire and the black wire came loose when freeing the assembly.
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Old 5th Oct 2020, 12:08 pm   #7
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Good that your widget piece is not missing, as that would have been a stopper.

I found it difficult and took numerous iterations of moving the roller switch gear out of the way to make small adjustments to the lateral position of the widget then refit the gear each time (so the gear wheel on roller switch gear meshes at a different position on the widget) before all came good.

It is difficult to explain but basically you have to position the widget so that for each speed selected the steel pin on the roller switch gear drops down into the bottom (trough) of the saw tooth shaped metal piece, for the 7.5 ips speed it is not a sawtooth but a square where the pin has to drop smoothly (not forced) into the corner of the square.

I will take some photos to try and explain better and take some approximate measurements of where the brass pin on the widget is distance wise from the case wall
for each speed which may help to get you in the ballpark area.

Also will photo the wires and the singe or double switches, to see if you also need to modify the wiring back to standard.

David
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Old 5th Oct 2020, 12:22 pm   #8
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Correction to above, the steel pin does not drop down/move, it is the sawtooth shaped piece that moves up to meet the pin.
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Old 5th Oct 2020, 1:03 pm   #9
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Approximate dimensions from the inside wall of the case to the inside edge of the brass pin on the widget.

7.5 ips = 25mm
3 3/4 ips = 20mm
1 7/8 ips = 13mm
15/16 ups = 8mm

A good reference is that the brass pin on the widget sits virtually directly under the steel pin of the roller switch assembly when switched to 3 3/4 ips. From the second photo attachment it looks like the brass pin is very slightly to the left of the steel pin when viewed from the rear.
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Old 5th Oct 2020, 1:53 pm   #10
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

This and next Post has 7 photos showing the position of the steel pin in relation to the sawtooth:-

Photo # 1 = 7 1/2 ips
Photo # 2 = 0 speed between 7 1/2 & 3/ 3/4 ips
Photo # 3 = 3 3/4 ips
Photo # 4 = 0 speed between 3 3/4 & 1 7/8 ips
Photo # 5 = 1 7/8 ips
Photo # 6 = 0 speed between 1 7/8 & 15/16 ips
Photo # 7 = 15/16 ips
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Old 5th Oct 2020, 1:54 pm   #11
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Remaining 2 photos for Post #10.
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Old 5th Oct 2020, 2:08 pm   #12
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Attached photo shows the speed selector switch wiring.

The black wire connects to the top left terminal, the red wire connects to the switch terminal directly below together with the brown wire.
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Old 5th Oct 2020, 2:25 pm   #13
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

First photo shows the K4 Play/Start switch, there should only be 1 of these on an unmodified unit, you will see on the photo there is a second switch on top of the lower one.

Second photo shows the K7 Rewind switch, once again there should only be one, there are 2 in my photo.

Both extra switches have had the fixed speed modification extra wiring removed.

Third photo shows a single K4.

So check your switches to see if 1 or 2 switches are fitted at each position.
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Old 31st Oct 2020, 4:24 pm   #14
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Any progress ?
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Old 31st Oct 2020, 5:07 pm   #15
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

The OP never returned. I've emailed them a link.
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Old 1st Nov 2020, 5:43 am   #16
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Still here sorry!
I don't seem to get emails from replies for some reason so I keep needing to come back to the thread and manually check.

Some progress has been made. I've got the gear assembly restored. It's a bit wonky so I'll need to keep adjusting, perhaps removes the stopper that goes into the divets in the gear face for finer movement.

I'm having what I think might be a torque issue between the motor and spools as smooth playback only happens when both of the playback buttons are pressed down.

The K4 switch does seem to be modified, is that what's causing the single speed?

Also what does the K7 switch be by default? I'm not getting FF or Rewind, does it govern both?

I'm starting to think I'm in way over head here
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Old 1st Nov 2020, 1:04 pm   #17
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Banner above post 1. Thread tools - subscribe to this thread, if automatic subscription is not set up in your profile.
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Old 1st Nov 2020, 2:30 pm   #18
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

There is only 1 playback button (Start) can you clarify please what you mean by 2 playback buttons ?

David
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Old 1st Nov 2020, 2:33 pm   #19
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Quote:
Originally Posted by DerciiDercii View Post
Still here sorry!
I've got the gear assembly restored. It's a bit wonky so I'll need to keep adjusting, perhaps removes the stopper that goes into the divets in the gear face for finer movement.
Not entirely sure what it is you describe but definitely should not be necessary to do that.
Quote:
The K4 switch does seem to be modified, is that what's causing the single speed?
I am not sure but do not think so.
Quote:
Also what does the K7 switch be by default? I'm not getting FF or Rewind, does it govern both?
It enables power to the motor both in FF & RWD, is your K7 a single switch or 2 switches ?

David
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Old 1st Nov 2020, 6:46 pm   #20
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Default Re: Uher 4000 Report Monitor - Speed Control wiring and gearing?

Before the new part was fitted was it functional on the single speed ?

David
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