(Topic ID: 96521)

Tech Help Please: Scared Stiff

By JKirby

5 years ago

Topic Stats

  • 18 posts
  • 6 Pinsiders participating
  • Latest reply 4 years ago by zaza
  • Topic is favorited by 2 Pinsiders


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#1 5 years ago

Good Afternoon Everyone,

Working on my Scared Stiff - the spider motor won't spin. There are no schematics in the manual, so I'm hoping someone here can point me in the right direction.

What I know: The LED is lit, I'm assuming this means voltage. When I attempt the spider test it seems like the motor is trying to spin. I can hear it humming, and when I put the actual plastic pointer on it the pointer shakes as if it's trying to move. Please note that is a new motor. I took the cover off and the lubricant on there is still viscous and not dirty.

What can I look for to try to resolve this? Any help would be much appreciated.


#2 5 years ago

Measure voltage at the motor. If low it won't work, if right bad motor.

LTG : )™

#3 5 years ago

Just in case you need a new motor, look here for $14.95:
I bought and install one and it worked great.

#4 5 years ago

Measure voltage at both sets of wires (4 wires, 2 & 2 without a schematic I'm assuming they're paired). I get 6.9V DC at both pairs, when I run the motor test, 1 set drops to 0v, the other stays constant at 6.9V

Is that a strange voltage? I figured it would be 12V

#5 5 years ago

The gray/yellow wire, witch comes from J141-2 should be 12v, and goes to both. The other wire for solenoid #39 is yellow/white and goes to J110-4, and for solenoid #40 it is green/white and goes to J110-5.

#6 5 years ago

I have 14v at gray/yellow, 9.7v at Green/brown & 10.7 at Tan/red - the connector coming from the backbox to the stepper board. Measurements taken on the pins of the stepper board connector while not plugged into the board.

#7 5 years ago

So is the yellow/white replaced by the green/brown, and green/white replaced by the tan/red? Do these wires go to the solenoids or come from J110-4 and J110-5?

#8 5 years ago

Sorry, I just went across the connector and measured what voltages I had. Yellow/White has continuity with the J110-4 as does the Green/White at J110-5. Measuring these two wires for voltages yields a reading of 0v.

#9 5 years ago


Here's a picture where you can see the basics of the operation of the wheel.
Depending on the inputs A and B, the exits of P2 are 0 volt or 9 Volt dc.

#10 5 years ago

Ok, sounds like the 9-10v on one and 0v on the other is a good reading. But you said earlier you only got 6.9v, so where's the voltage drop. Low voltage probably won't let the motor run.

#11 5 years ago

Maybe one channel is working and gives a lower reading because of the high-speed pulsing,
and the channel other is stuck to 0 and 9 volts.

In that case, one of the data inputs could have bad connection.

#12 5 years ago

All of the diodes check out (tested in circuit), only one that's possibly off if D10 - measures 664. Most all of the resistors are within tolerance, except the 100K, that reading is at about 60K.

Anything else I should check for? I've reflowed solder on the input connector.

Thank you for all the help so far everyone.

#13 5 years ago

With some reservation because I have no Scared Stiff or stepperPCB to verify.

D10 and D9 are in serie and should measure about the same.
Resistor 100K reading 60K, is that R13 ? That one is for Opto-receiver and not motor-control. does opto work?

During the spider motor test, PDB J110-4 and J110-5 are pulsing at high speed from high to low.
This signal is connected to steppermotorcontrolboard J1-4 and J1-5.
High = 12Volt Low = 0Volt. If there's no pulse, possible U3 of PowerDriverBoard is bad

If there is a pulse signal, you could perform this test to find out if the stepperPCB is working:
-machine on
-disconnect PDB J110
-jumper J1-7 (GND) to J1-4 (input A). Does the motor move 1 step ? and/or
-jumper J1-7 (GND) to J1-5 (input B). Does the motor move 1 step ?

You mention you hear the motor humming so I assume settings A.2 30 is set to "NO"

1 week later
#14 5 years ago

Well, the problem is resolved. Ended up being the 5 pin molex connector in the back box. Replaced the housings and repinned all the wires and now it works like a charm. Some testing with alligator clips & my meter helped me isolate this.

Thanks to everyone that helped. There are a lot of really smart people that post on here.


7 months later
#15 4 years ago

Hoi Zaza,
Its sounds you know how it works the spider motor, i tried some stuff bud it wont turn.

please help.

#16 4 years ago

Help is on the way, but it's almost sleeping time over here but will first finish my drink.
What's the problem with the spider ?

#18 4 years ago

Ok, will look there

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