Troubleshooting 2
© 2000 Martin Professional A/S, Denmark
Martin University MAC 2000 Service Seminar
MOTORS
To avoid damage to the step drivers, always turn off the power before connecting or
disconnecting the motors.
The pan and tilt motors in the MAC 2000 are 3-phase stepper motors. All other motors are
2-phase steppers.
Important! NEVER test 3-phase drivers with the Martin step drive tester!
STEP MOTOR DOES NOT TURN, OR TURNS ERRATICALLY
Burned-out step driver: Most step motor problems are due to a burned-out driver. A
burned-out driver results in erratic or no movement. Test 2-phase drivers with the Martin
step drive tester or switch the motor to another circuit.
Two LEDs on the PCB, LD 401 and 402, indicate the status of the 3-phase drivers. When
lit, one or more of the drivers is defective. If both of the LEDs are unlit, the 3-phase
drivers are okay.
To test the 3-phase drivers, remove the fixture from power and disconnect the pan and tilt
motors. Measure the resistance across the driver gate and source pins by placing the
negative probe on the G (gate) pin and the positive probe on the S (source) pin as shown. A
very low reading, below 10 ohms or so, indicates a defective driver.
If the drivers pass the resistance test but you still suspect them, you can also check the
drivers with an oscilloscope. Set the voltage scale to 10 V and the time scale to 10 µs: with
the motors connected, one will see a square wave signal across the output to the motor if
the driver is working properly.
Bad connection: Check continuity between the motor and the PCB. Alternatively, check
the connections from the PCB to the connection block by putting a working motor on the
circuit. Check the wires from the motor by plugging it into a working circuit.
Burned out motor: You should only feel slight resistance when turning a step motor by
hand. Replace the motor if it is hard to turn. You can also check for equal resistance on the
windings. The resistance should be close to the values shown below.
MOTOR TURNS THE WRONG DIRECTION
Reversed motor cable: Unplug the motor cable and flip it over.
gate(-) (+) source
Motor P/N Where used Approximate coil resistance
Stepmotor, standard mini, 22 mm shaft 05701201 cyan, yellow 120 ohms. Measure across pins 1&3, 4&6.
Stepmotor, standard mini, 10 mm shaft 05701202 magenta, CTC 120 ohms. Measure across pins 1&3, 4&6.
Stepmotor standard small (micro) 05701601 gobo 1 rotation, gobo 2 rotation 145 ohms. Measure across pins 1&3, 4&6.
Stepmotor, standard small, 22 mm shaft 05701602 gobo 1 shift 140 ohms. Measure across pins 1&3, 4&6.
Stepmotor, standard small, 12mm shaft 05701603 iris, gobo 2 shift, color shift, 140 ohms. Measure across pins 1&3, 4&6.
Stepmotor, standard medium, 9V micro 05701606 effect shift & rotation, focus, zoom 40 ohms. Measure across pins 1&3, 4&6.
Stepmotor, standard medium 12V HT 05701607 dimmer (2) 65 ohms. Measure across pins 1&3, 4&6.
Stepmotor, 3 phase 05703801 pan (2), tilt (2) 4 ohms. Measure across pins 1&3, 1&7, 3&7.
(Pin 1 = yellow, pin 3 = blue, pin 7 = yellow)
(28 Seiten)
(40 Seiten)
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