Mk-products MK Cobramatic Pro Series User Manual download pdf (Page 16)

Cobramatic

Pro Series Owner’s Manual - Page 9





The gun should be tested prior to testing circuitry on the main board.

Gun amphenol must be connected to the Cobramatic

Pro Series cabi-

net to perform the following tests.

To test the motor voltage circuit and measure how much voltage is being

delivered to the gun motor, place a voltmeter across diode test points 

and depress gun trigger. A reading between  should be

observed, as the gun potentiometer is varied.





Remove the connector from the cabinet.

Using the Amphenol connector, check the resistance across pins  and 

(motor leads).

If an open circuit (more than K ohms) or short (less than 2 ohms) exists, check

the motor leads and motor independently.



Using the gun amphenol, check the resistance across pin  (wiper) and

pin. The resistance should vary fromas you turn pot.

Check the resistance across pin (wiper) and pin. The resistance

should vary fromas you turn pot.



Using the gun amphenol, check for continuity across pinsand when

the trigger is pressed.

Figure 9

For reference, see Main PC Board Connections picture in Section F

Motor Voltage

Test Point

TP2

Motor Voltage

Test Point

TP1

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 42 43

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Mk-products MK Cobramatic Pro Series User Manual Page 16