Allied MultiPrep

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Motor

Both motors (drive, osc) were identical

PITTMAN
GM8712-41
19.1 VDC
187:1 RATIO
MFG 05-29-98 S

33 and 17 ohm. Is one of these damaged? Why are their resistances so different?

Tried testing under load

  • black goop
    • 12.19 V @ 1.266 A (current limited)
    • 8 ohm after
  • other
    • Initially drawing way less current than first
      • 12.12 V @ 0.332 A (voltage limited)
    • then started smoking
      • 11.68 V @ 1.248 A (current limited)
    • 6 ohm after

Aren't these rated 19.1 V? Am I misunderstanding?


Try pinning out the spare bad head

  • 1-5: 2.8 k
  • 2-6: 147 R
  • weird...


what does the secondary machine test? (believe good)

  • 1-5: 9.0 R
  • 2-6: 10.4 R


What is max voltage allied puts out on motors?

  • 1-5
    • 7.6 (fixed)
    • osc
  • 2-6
    • 15.0 (max)
    • drive


Head connector

Head plug

  • 4x2 (8 pins)
  • 3 mm pitch
  • Head female, cable male
  • Maybe Minitek Pwr™ 3.0 Series
    • https://www.digikey.com/product-detail/en/amphenol-icc-fci/10132445-08LF/609-5283-ND/7590945
Mcmaster allied multiprep head 4x8 connector.jpg
Mcmaster allied multiprep head cable standard.jpg
Mcmaster allied multiprep machine new connector label.jpg
8 pin mini-amphenol t o 8 pin mini-DIN "standard connector" https://en.wikipedia.org/wiki/File:Pseudo_miniDIN-8b_Diagram.png
Mini-amphenol mini-DIN Signal Note
1 1
2 2
3 8
4 7
5 3
6 5
7 6
8 N/C
Mcmaster allied multiprep machine old connector label.jpg
5 pin mini-DIN to 8 pin mini-amphenol Same connector as S-video Needed for old machine https://en.wikipedia.org/wiki/Mini-DIN_connector#/media/File:Close-up_of_S-video_female_connector.jpg
Mini-amphenol mini-DIN Signal Note
1
2
3
4
5
6
7
8

Motor on mini-DIN

  • 1: drive motor +
  • 3: drive motor -
  • 7 V
8 pin CPC to 8 pin mini-amphenol Guessing this was a custom cable
Mini-amphenol cpc Signal Note
1 8
2 6
3 1
4 4
5 5
6 3
7 2
8 N/C


Tach board

  • Adapts 8 pin to 4 pin
  • Includes cap + 4 pin SMD component (489, probably hall effect sensor)
  • Must interface to those two red things I was confused about...looks like they have magnets on the end
  • Minitek 4x2
    • 1: 4x1.1
    • 2: 4x1.3
    • 3: hall, cap
    • 4: hall
    • 5: 4x1.2
    • 6: 4x1.4
    • 7: hall, cap
    • 8: chassis ground
  • 4x1
    • 1: osc
    • 2: osc
    • 3: drive
    • 4: drive

Test primary machine motor via 4x1

  • drive: 10.2 R
  • osc: 5.6 R
    • *** out of spec
    • consistent with a failed motor


failed motors appear to be caused by carbon buildup from brushes. They will fail very quickly if you operate them even close to their rated voltage. I was able to disassemble and blow one out to fix it. Now it runs at about 12.22V @ 350 mA. Current went down over time, maybe was 500 mA initially

Lets try another... initially 12.22V @ 1.25 A. Visible smoke. Rotor very dirty...should have cleaned other rotor. After cleaning dropped to 12.22V @ 1.1A and then rose up. Hmmm. Clean between rotar contacts. Success! Now 12.21 V @ 153 mA! Significant improvement! 9.6 ohm now

Back to original motor. Cleaned, now drawing 12.21 V @ 0.180 mA. Seems pretty concrete: needs to be cleaned, especially between rotar contacts. Try 18.86 V @ 197 mA. 9.6 ohm

Try osc motor. Didn't try running initially for fear of damaging. After cleaning (worst of all motors so far) 12.19V @ 175 mA. Current seems to be going down as well. 12.19 V @ 200 mA installed. However system is still not turning it (ie its not applying voltage). Other motor is about the same (even though it wasn't cleaned). Osc 9V on 8 pin. Osc motor being driven at 1.3V. Maybe power supply is failing? Current seems okay to me

McMaster

2020-01-14

  • Win cross sectioning kit


2020-02-20

  • Order sample holder
  • Order replacement tubing
    • Later found I had some spare, but meh can use for other projects


Primary

S/N 568


Hermitage: Allvia Sunnyvale? Not sure if they are still in business


2019-12-19

  • Submitted offer. Negotiations failed


2020-02-19

  • Seller accepted offer (was firm at old offer). Local pick up


2020-02-232

  • Swap DRO from spare to primary machine
  • Replace rusted micrometer


2020-02-23

  • Observe osc motor is not moving
  • Observe osc doesn't have slit like spare to keep in place...how is it supposed to work?
    • Is this a DRM thing of sort where they didn't supply the right adapter if the user didn't purchase osc option?
    • ie the motor was intentionally disabled and also mechanically hindered

Spare

???

  • Won a few lots of parts TechPrep heads
  • Goal: combine into one good head and mount on SBT machine


2019-03-20

  • Try to get old TechPrep base. Negotiations failed


2019-12-20

  • Won old TechPrep base machine. Change plan from retrofitting SBT machine to actually fitting on this machine
  • Without reference machine a little difficult to piece together
  • Machine filthy. Significant cleaning


2020-02-23

  • Used reference machine to greatly accelerate repairs
  • Made cable to hook up head
  • E1.43 (error code?) persists, but machine seems to work fine