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Digital Microforce 2
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1. 1 3 5 7 9 111315 iv Testing and Adjustment procedures CAUTION These tests involve measuring voltages on the pins of integrated circuits and or test points with very fine spacing Accidentally shorting adjacent pins MAY DESTROY the devices Only a skilled technician should undertake these tests Refer to fig 3 for test point and potentiometer locations 1 Power supply operation The digital Micro Force has four switching power supplies controlled by IC s U12 U13 U14 and U20 All four supplies are active when the Micro Force is driving a digital motor They generate 23 5V 9V 5V and 3 3V 3 3V respectively U12 acts as a voltage booster in that its output voltage is 23 5V for input voltages less than 22V and its output voltage tracks the input voltage for voltages greater than 22V When the control is used in the Analog mode for generating a Zoom command signal to control the FI Z zoom channel or operate the internal servo of a video lens the 5V and 23 5 V supplies are turned off to minimize current consumption 2 To test the power supplies power the unit with a 12V 2A source PTC1 is a 1 6A thermal fuse which protects the unit from catastrophic damage It is located next to test point TP2 If it is hot to the touch there is a short circuit or damaged component This fault must be remedied before proceeding further The table below lists the voltages generated on the circuit board
2. 99 With nothing contacting the red joystick knob measure the voltage between test points 3 and 4 Adjust VR2 to make the reading less than 0 20mV This completes the joystick offset adjustment Check for joystick hysteresis by momentarily applying pressure to the red knob in one direction and then releasing After allowing 10 20s for the meter reading to stabilize the reading should return to less than 1 mV Repeat this but with pressure applied in the opposite direction Again confirm that the reading is less than 1 mV Excessive hysterisis can be caused by the joystick receiving a large mechanical shock The next steps is for adjusting the digital motor offset Use a Y motor cable to power the control but don t connect a motor Place the control on a flat surface Make sure nothing is contacting the red joystick knob Press and hold simultaneously buttons Set and Reset for 3 5 seconds and then release This will automatically determine the value for the digital motor offset and store it into memory The last step is for adjustment of the analog mode offset Connect the control to a Video lens or the FIZ unit using an appropriate cable Be sure that the sensitivity control is set to minimum O as before Find pins 7 and 8 of connector J1 on the circuit board the brown and brown white striped wires See fig 3 Use fine probe tips on the voltmeter probes to measure the voltage difference between pins 7 and 8 Adjust VR3 until th
3. by the associated IC s All voltages are measured relative to the ground pin see figure 3 IC s or test points located on the bottom side of the circuit board are designated with an asterisk Voltage Designator IC P N Test Point 23 5 0 5 U12 LT1370HV C41 4 5 0 0 2 U14 LM2675 5 C36 9 0 0 3 U13 LM2675 5 C51 4 3 3 0 1 U8 LTC1877 C69 R45 340 5 U8 LTC1877 C71 Voltages which are outside of the stated tolerance may indicate either a defective IC a faulty passive component capacitor inductor or diode or an improper load It is strongly that the factory service department or a designated PCS service representative perform board level repairs Null Adjustments The following procedures are used to eliminate motor creeping when operating pressure is not applied to the joystick The procedure has three parts null adjustment for joystick offset digital motor offset and analog mode offset The null adjustment for the joystick must always be performed first A digital voltmeter with 0 1mV resolution is required Use small grabber hooks to make contact with the test pins aon Remove the 4 screws securing the cover of the unit Apply power using either a Y cable for connection to a digital motor a cable for connection to a FIZ system or a cable for a video lens Secure the unit at a typical operating angle 30 to 45 typical Turn the maximum speed control clockwise to
4. the lens to the other desired limit Release the button Now the lens will stop at these limits Use the bargraph display to feather the move as the limit is approached The Reset button erases the limits The Lens Cal button initiates the calibration procedure The soft stop function automatically slows the zoom motor as it approaches the end stops The point where deceleration begins is programmed by pressing the Soft Stop switch fig 3 below and setting the deceleration distance by pressing the joystick up or down The lit area of the bargraph shows the relative distance over which deceleration takes place Release the Soft Stop switch to resume normal bargraph display operation Fig 3 Setting the soft stop distance Micro Forces Digital 2 Set Reset T Stop Gal Dir Preston Cinema Systems USA 8 N D25037 6 Troubleshooting Guide Problem Action Power light is off Check power source Is battery OK Is power present at accessory socket Check unit with auxiliary power cable The thermal fuse may have opened Remove power for 1 minute Motor stops during calibration Is the gear mesh too tight Does the lens bind Check that the motor bracket doesn t move and that post through the motor is tight Is the motor jammed Check operation with motor decoupled from lens gear Press the reset button and recalibrate the lens Power light is on but the zoom motor doesn t move Check the s
5. 30 VDC max Idle current is 55mA at 24 VDC or 95mA at 12VDC The maximum current drawn under stalled motor conditions is 1 2A 24V typ or 2 4A at 12V The actual current requirement is proportional to the operating torque and the current limit set on the circuit board Operating Procedures CAUTION The motor will start rotation as soon as power is applied to the unit Make sure your hand is clear of the moving gear a Attach the DM1 DM1X or DM2 motor to the matte box support rods using a 19mm motor swing arm product series 4300 with a step down bushing for 15mm or 625 rods if required Make certain that the rods are secured against rotation Use the Arri or Panavision Bridge 4304 4311 to prevent 15mm or 625 rods from twisting b Position the motor so that its gear teeth are engaged with the corresponding teeth on the zoom ring of the lens Auxiliary gears product series 4231 4240 4241 are available to enable the motor to drive either Panavision 48 DP gearing or 50m 60m gears for Canon and Fujinon video lenses Check that the gears are meshed just tightly enough to eliminate any play but not so tightly as to cause the gears to jam Connect the Microforce 2 to its power source The green LED power indicator should be illuminated The motor will calibrate by finding the mechanical end stops of the lens During this phase the motor current is limited to a low value so as not to apply excessive force to the lens The bar grap
6. Digital Micro Force 2 Manual ver 1 2 Micro Force Digital 2 o Set Reset 6 Soft Stop Cal Dir I Preston Cinema Systems USA 8 N D25037 Preston Cinema Systems e 1659 Eleventh Street e Santa Monica CA 90404 fig 1 Digital Micro Force 2 control descriptions LEMO receptacle io Camera Run Threaded well Micro Force Micro Force 3 Switch for bracket Digital 2 Digital 2 Reset Set zoom zoom limits ed bed limits Zap Switch Set soft z Joystick fae Sott Stop Cal stop limits Calibrate Zoom lens end Sensitivity stops display w Motor Dir Zoom Bargraph Direction position indicator J Preston Preston Cinema Cinema Systems Systems USA USA Zoom marking strip B N 025018 8 N D25037 Zoom Sensitivity adjustment knob fig 2 Microforce control with Pan Arm Adapter accessory p n 1155 for and 17mm pan bars Digital Microforce 2 Introduction The new Digital Microforce 2 builds upon the same robust force sensor technology which made the Micro Force an industry standard The Digital Microforce 2 features automatic lens calibration electronic limit setting and a bright LED bargraph display of zoom position This latest version adds programmable soft stops and a new speed control knob with a digital readout The rugged housing machined from solid aluminum alloy protects the control from mechanical abuse and assures years of reliable operation Its ergonomic design provides a r
7. able custom length Canon Video Y cable 8 pin Tajimi Anton Bauer power tap Fujinon Video Y cable 8 pin Tajimi Anton Bauer power tap Canon Video Cable 20 pin Hirose Y Cable for Sony HD Panasonic HD Canon Video Cable 12 pin Hirose Fujinon Video Cable 12 pin Hirose DM2 Digital Motor DM1X Digital Motor 48 pitch zoom gear for Panavision lenses 5 0m gear for Canon lenses 60m gear for Fujinon lenses Arri 19mm Swing Arm Arri Panavision Swing Arm Moviecam Arri Swing Arm Step Down Bushing 19mm 15mm Arri Step Down Bushing 19mm 625 Panavision Articulating Pan Arm Bracket for Digital Micro Force and VF2
8. e voltage difference is less than 0 10mV This completes the analog mode offset adjustment VR4 is used to null out joystick asymmetry It s setting should not be altered unless the joystick is replaced v Current Limit adjustment The current limit adjustment pot VR1 determines the maximum motor torque both during calibration and normal operation The operating torque is approximately 40 higher than the calibration torque The stall current through the motor is factory set to 0 90A Turning VR1 anti clockwise increases the maximum motor torque each full turn of VR1 roughly corresponds to a 10 change fig 4 DM1 DM1X and DM2 digital motors DM1 DM1X DM2 fig 5 Micro Force with FIZ Hand Unit Camera Preston Cinema Systems Product Number 1210 1128 1129 1130 1220 1221 1222 1225 1226 1227 1234 1234V 1235 1236 1237 1238 1240 1241 1258 4201 4205 4231 4240 4241 4301 4302 4333 4320 4321 1155 Digital Micro Force Controls and Accessory List Description Digital Micro Force 2 Control Auxiliary Power Cable 12V 4 pin XLR Auxiliary Power Cable 24V 3 pin XLR PV polarity Auxiliary Power Cable 24V 3 pin XLR Arri polarity Y cable for 12V Arri Cameras Y cable for 24V Arri Cameras Y cable for Panavision Cameras Y cable for Aaton Cameras Y cable for Moviecam Cameras 2 pin Fischer Y cable for Anton Bauer Power tap Extension Cable 25 Extension Cable 25 for video lens only Extension C
9. etting of the Speed Control Was the set button pressed inadvertently without moving the zoom position This will result in having the two limits next to one another the span will be zero and the lens won t move Press the reset button to clear any limit stops Check that all the connectors are firmly seated Zoom Motor creeps with no pressure applied to the joystick See service guide Section 7 iv 3 7 Technical Information and Service Guide i LEMO 14 pin out Type EGG2B314 Power Gnd m d Momentary Run inverse i Run Run inverse Vref input Zoom Command output X Motor Plugged inverse Encoder Channel B Encoder Channel A Encoder GND 5V Motor Drive A Motor Drive B OOOO Bag OO Nor PRPRPPR FPWNRO ii DM 1 DM 2 LEMO pin outs LEMO type EGG1B307 receptacle 1 Motor Drive B 2 Motor Drive A 6 3 Encoder Channel A Q 4 5VDC 5 O0 O 5 GND OO 6 Encoder Channel B 4 7 Motor Plugged inverse iii 16 pin Berg Housing 1 Battery 2 Battery 3 Switch common momentary 4 joystick 5 Joystick output 6 joystick 7 Video Ref input 8 Zoom Command output 9 Motor Plugged 10 Encoder Channel B 11 Encoder Channel A 12 GND 13 n c 14 5V 15 Motor Drive A m e a Motor Drive B Fig 3 Circuit board showing test points and potentiometer locations TP3 4 APE w i 2 4 6 8 10 12 14 16 VR2 Ground Pin under wires J1
10. h indication will remain dark until this operation is completed After finding the end stops of the lens the motor stops and the bargraph indicator will light indicating the position of the zoom setting The zoom speed and direction can now be controlled by applying pressure on the red joystick button 5 Control Functions a The Maximum speed Zoom Sensitivity control is located at the bottom of the control The adjustment range is 8 turns of the Zoom Sensitivity knob with a corresponding range of the digital display from 0 99 The zoom speed and direction is controlled by applying finger pressure to the red joystick knob either towards the top or bottom of the control The Direction switch reverses the motor rotation The Camera Run switch has 3 positions center Off Toggle On away from the joystick and Momentary On towards the joystick The Toggle On position is for cameras requiring a continuous signal to run i e Arri 12V Panavision Aaton while the Momentary On is for cameras requiring a short pulse to change from run to stop i e Arri 24V Moviecam Sony RED digital The Zap switch sets the control to maximum speed Pressing this momentary switch allows the lens to be returned quickly to position despite a low maximum speed setting The Set button is used to set limits to the zoom range To set limits position the lens to the first limit using the joystick While depressing the Set button press on the joystick to move
11. ounded grip for comfortable all day use and also offers a convenient attachment point for its mating Pan Arm adapter The new speed control knob is virtually indestructible It turns with glassy smoothness that reflects on the careful design used throughout The unit can drive the DM1 DM2 or DM1X digital motors Its powerful drive capability assures trouble free operation with even the largest zoom lenses Motor connection is made via a series of molded Y cables These cables are available for both film and video cameras and allow the Digital Microforce 2 to remotely control the camera run stop or VTR functions respectively The Digital Microforce 2 also supplies the analog command signal for controlling the zoom channel of the FI Z system the internal servos of video lenses or the Radio Micro Force wireless module Power Connections The Micro Force may be powered using the following types of cables n Y Cables product series 1200 for specific film and video cameras Micro Force power is drawn directly from the accessory socket on the camera b Video Cables for Canon Fujinon and Nikon lenses Power is drawn from the 12 pin Hirose connector on the lens Zoom cables series 4444 4445 for use with the FI Z system Auxiliary power cables product series 1128 1130 may be used in conjunction with Y cables to power the control directly from a battery Qo Power requirements The Micro Force operates over a voltage range of 11
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