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6 : M e c h a n i c a l a n d E l e c t r o n i c A d j u s t m e n t s

CHRISTIE

CHRISTIE

35/70 Service/PM Manual

March, 1997

M E C H A N I C A L A N D E L E C T R O N I C A D J U S T M E N T S

This section describes the overall mechanical configuration of the projector and details adjustments that may be required
as the result of repair or parts replacement. All necessary mechanical and electronic adjustments are made before the
projector is shipped from the factory.
Figures 4.1 and 4.2 illustrate the features of the film path side and the mechanical side, respectively, of the 35/70
Projector.

General Approach to Adjustments

The adjustments and replacement procedures described in this section are ordinarily performed individually as the result
of a repair, or because a part has been accidentally disturbed. The order and grouping of the adjustments in this section
represents the typical approach to the projector, and is related to the diagnostic approach embodied in the following
chapter on troubleshooting.
The starting point is to ensure that the system will come into a READY state, and that the shutter and optical system are
performing satisfactorily. Next, the constant velocity system and the film handling loops and gate are set up, and the film
is correctly threaded on the machine. With the film handling in place, the reeling system is set up, allowing the film to be
transported in slew modes. Finally, the pulldown system is set up to allow cine motion and the projection of the image.
In many cases, the adjustment sequence must be repeated to obtain optimum performance. Coarse adjustments are first
made to get the system operating; then finer adjustments are made, often by observing the projected image.

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Содержание 35/70

Страница 1: ...CHRISTIE I N C O R P O R A T E D 35 70 Automated Electronic Film Projector Maintenance and Service Manual CHRISTIE INC 10550 Camden Dr Cypress Ca 90630 714 236 8610 Fax 714 229 3185...

Страница 2: ...that may appear in this document CHRISTIE CHRISTIE or its subsidiaries designated representatives and any other vendor of the 35 70 Automated Film Projector are not responsible in any way for any lia...

Страница 3: ...f detail that are suitable for various purposes For operators and for general information see Section 2 General Description Section 3 Operating the Projector Section 4 Periodic Maintenance Section 8 E...

Страница 4: ...erfaces directly with the 35 70 projection system is not covered in this manual The projector can operate at speeds of 24 25 30 48 or 60 frames per second and can be configured to use 35 millimeter or...

Страница 5: ...Service PM Manual July 1997 Installation and Unpacking This section provides unpacking information installation data and external connection data for the 35 70 Projector For physical and electrical in...

Страница 6: ...2 G e n e r a l D e s c r i p t i o n CHRISTIE INC 35 70 Service PM Manual July 1997 The lamphouse is not part of the projector system...

Страница 7: ...he selected floor area should be of extremely solid construction to minimize transmission of floor vibration to projection equipment 2 When the projector is supplied without a lamphouse attach the pro...

Страница 8: ...2 G e n e r a l D e s c r i p t i o n CHRISTIE INC 35 70 Service PM Manual July 1997 Refer to Section 6 8 for correct voltage strapping of power supply transformers prior to connection...

Страница 9: ...show and the number of the show that is to be played next called next show The projector has sensors that detect the reflective tape used to indicate the show number beginning of film BOF and end of f...

Страница 10: ...he reel counter and frame counter were compared at the point that is 2 minutes 37 seconds and 15 frames into Show 2 their values would be Reel Counter 01 06 55 19 3 52 14 0 16 20 2 37 15 Frame Counter...

Страница 11: ...orations in error and corrects the error during the next pulldown by pulling either more or less film as appropriate The pulldown is automatically synchronized with the shutter as the running frame ra...

Страница 12: ...own in Figure 2 1 The keypad LED display strip normally indicates the frame counter for the current show However this display strip may also display other command specific information as explained in...

Страница 13: ...ndicators The LEDs associated with the keypad provide an indication of projector status Table 2 3 contains a list of the keypad LEDs and their indications Upon detection of a malfunction that causes a...

Страница 14: ...in the gate 8 There is EOF sensor tape in the gate 9 Keypad control is enabled CLEAR AUTO The projector is in the CYCLE TEST mode G The projector is receiving or performing one of the G function comma...

Страница 15: ...et Projector commands are encoded in a hexadecimal character format They are sent to the projector by the show controller by a service terminal or from the keypad Some common commands have been assign...

Страница 16: ...try or LED is described the key s identity is enclosed in brackets as STOP If more than one key must be hit keystrokes are separated by a comma C0 The STOP Command OP L This operational command causes...

Страница 17: ...d the douser will automatically open after 3 seconds 3 Play current show 4 Stop at EOF marker 5 Rewind to head of show STATUS Set to 1 while advancing with douser closed set to 3 while playing with do...

Страница 18: ...d put the projector into slew mode STATUS Set to 1 C5 The CLEAR CUES Command OP This operational command is used to erase all previously programmed BOF and EOF cue points ENTRY CMD C 5 CODE C5 ACTION...

Страница 19: ...ference Load the film on the reel so that the BOF tape for Show 1 is above the gate or on the supply reel Chapter 3 READY READY Puts projector into READY mode Section 0 SET MAX SHOWS 5 H D 5 Sets numb...

Страница 20: ...t show on the film this may not be the next show in a programmed sequence A CUE command must be issued prior to the first time a show is played after the system powers up thereafter the projector trac...

Страница 21: ...nter a G1 DISPLAY COUNTER command ENTRY READY CODE CA ACTION S 1 Apply power to motor systems 2 Check all limit switches 3 Check the CV Pulldown and Shutter motor systems 4 Set loop 5 Execute single f...

Страница 22: ...res the entered BOF or EOF value STATUS Unchanged Before beginning the manual logging process it is necessary to create a log sheet such as the one shown in Figure 2 2 SHOW SHOW NAME START TIME STOP T...

Страница 23: ...t have been entered Enter the C D command followed by a 1 to indicate Show 1 then press ENTER to step through the entire set of BOF and EOF reel times BOF and EOF values are not changed CD The SHOW CO...

Страница 24: ...a second CYCLE TEST command is entered The current cycle completes and the system returns to the start point of the first show A STOP command pauses the cycle a FORWARD or REVERSE command resumes oper...

Страница 25: ...EXT SHOW command see Section 0 STATUS Set to 1 while moving to first frame Set to 3 while playing douser open Set to 0 when stopped at end of show H2 The SET GOTO Command DX This diagnostic command al...

Страница 26: ...d should only be used if there is a problem with the current value ENTRY CMD H 4 CODE H4 INPUT 1 Enter the new value for the frame counter in the counter format hh mm ss ff see Section 0 2 Press ENTER...

Страница 27: ...Command DX L This diagnostic command triggers the projector to move the film to the point in the show that was previously set with the SET GOTO command see Section 0 ENTRY CMD H 6 CODE H6 ACTION S 1...

Страница 28: ...layed for one second before the numeric display reverts to the frame counter The new next show value must be entered while the show values are displayed ENTRY CMD H 8 CODE H8 ACTION S 1 Display curren...

Страница 29: ...r MASTER projector Commanding the projector into INTERLOCK mode before a READY causes the projectors shutter to lock into a position 180 degrees out of phase This mode is useful for applications that...

Страница 30: ...mode CODE HC ACTION Displays pulldown gain STATUS Not applicable HC NOT RDY The BRAKE RELEASE Command DX This diagnostic command is used to release the upper torque motor brake to allow for easier fi...

Страница 31: ...ock mode allows the projector to be interlocked via BI Phase to an external motion source or MASTER projector To prevent film damage enter this command only when the external motion source is idle ENT...

Страница 32: ...ewhat From the projector control console the sequence is All alphabetic characters terminal hexadecimal digits entered into the service terminal must be upper case ENTRY G 0 CODE G0 INPUT Enter the fo...

Страница 33: ...dress is shown to the right of that address on the terminal s display yy New value for memory location two hex digits Value at selected address is updated Up arrow cursor Increment memory location Dow...

Страница 34: ...elect 25 frames per second Enter a 3 from the keypad to select 30 frames per second Enter a 4 from the keypad to select 48 frames per second Enter a 6 from the keypad to select 60 frames per second 2...

Страница 35: ...ilm STATUS Unchanged G4 The LOAD REEL COUNTER Command DX This diagnostic command loads the time code value of the frame counter register into the reel counter register This command is used for motion...

Страница 36: ...ch preceded by a PROMPT STATUS Unchanged Output Meaning PROMPT CR LF hh mm ss ff PROMPT BOF for Show 1 hh mm ss ff PROMPT EOF for Show 1 hh mm ss ff PROMPT BOF for Show 2 hh mm ss ff PROMPT EOF for Sh...

Страница 37: ...from the top of R150 is 0 volts 1 volt This adjusts upper torque arm position 4 Adjust R136 so that the upper torque arm sensor voltage as measured from the top of R149 is 0 volts 1 volt This adjusts...

Страница 38: ...last five commands sent to the projector over the RS 232 communication port The status is output on the RS 232 port to the show controller or the service terminal These commands are recorded only when...

Страница 39: ...mmand is used to park the BOF sensor tape in the gate The use of this command is associated with operating the projector in the Master or Slave mode and can be issued after a CUE command See Section 2...

Страница 40: ...ISTIE INC 35 70 Service PM Manual July 1997 GF The SOFTWARE VERSION Command DX This diagnostic command triggers the output of an ASCII string containing the software version number ENTRY CMD G F CODE...

Страница 41: ...the film as it might not be read through the film if it is positioned on the base side When a start command is given the film accelerates to cine speed before it encounters the BOF marker The film de...

Страница 42: ...ulled into the bottom the total bottom loop guide is 75 full For 35 millimeter film thread the film so that there are 20 frames plus 1 frame for every 50 feet of projector to screen distance of film b...

Страница 43: ...utter comes up to speed and is tested 5 The STOP and READY LED s go on and the SET LOOP LED goes off 6 Enter a CUE press CUE command The film moves forward in slew motion at 15 fps until the BOF tape...

Страница 44: ...ector then automatically cue s both projectors so that they are ready for the next show 8 Repeat steps 1 to 7 to play the next show Master Motion Controller Operation If the projector is to be used in...

Страница 45: ...e projector must be taken out of interlock with the LOCAL MODE HE command and rewound to the start of the show by entering a CUE NEXT H7 command into the projector 10 Repeat steps 2 to 9 to play the n...

Страница 46: ...ists equipment that should be available in the projection booth It should be easy and convenient for the projectionist to perform any required maintenance If the proper tools are not at hand it is unl...

Страница 47: ...ckle trips Check Sprockets Check torque arms Check picture quality Table 4 2 Daily Preventive Maintenance Checklist Log Sheet CHRISTIE CHRISTIE 35 70 Projector Weekly Preventive Maintenance Log Sheet...

Страница 48: ...nections Table 4 4 Monthly Preventive Maintenance Checklist Log Sheet CHRISTIE CHRISTIE 35 70 Projector Semiannual Preventive Maintenance Log Sheet Year 19 ________ Action Required Date Performed Inte...

Страница 49: ...rews damaged cables etc Replace Particle Transfer Rollers Clean back of projector with vacuum Table 4 6 Annual Preventive Maintenance Checklist Log Sheet CHRISTIE CHRISTIE 35 70 Projector Lamphouse Pr...

Страница 50: ...ll debris from the rollers Insure that the rollers are completely dry before re installing 2 If necessary clean the projection lens using the lens cleaning kit 3 Using the soft cloth carefully wipe th...

Страница 51: ...AREA 14 2269 SHUTTER ENCODER 15 SHUTTER MOTOR 16 2275 PULL DOWN AMPLIFIER 17 CONSTANT VELOCITY C V MOTOR 18 2269 C V MOTOR ENCODER 19 DOUSER INTERLOCK RELAY 20 LOWER BUCKLE LIMIT SWITCH 21 PULL DOWN M...

Страница 52: ...LL DOWN SPROCKET 16 2268 PULL DOWN SENSOR 17 LOWER C V BUCKLE PLATE 18 LOWER LOOP GUIDES 19 LOWER C V SPROCKET 20 35mm OPTICAL HEAD 21 PRE AMPLIFIER LOWER PARTICLE TRANSFER ROLLERS 22 LOWER TACHO GENE...

Страница 53: ...igure 4 2 2 Clean the DTS head or Magnetic head with a cotton swab dipped in isopropyl alcohol or using a soft brush 3 Open the back of the projector and vacuum the circuit boards 4 Generally clean al...

Страница 54: ...f the filter to free the filter from the threaded center post and slide the filter off d If replacement is not necessary clean the element 1 Blow dry compressed air 30 PSI or less through the element...

Страница 55: ...o generator is secure and there is no slippage between the generator and the roller 2 Check all power supply voltages 5V 15V 34V and 24V 3 Ensure the reeling motor brakes are operating properly in the...

Страница 56: ...terrelationship and timing between these circuits is shown schematically in the film velocity diagram and the system timing diagram both in Section 8 15 Miscellaneous Diagrams The Shutter Control Circ...

Страница 57: ...and direction of the constant velocity motor is controlled by the CPU The pulldown motor is slaved to the constant velocity motor so film moves through the film gate smoothly During slew operation the...

Страница 58: ...mplifier U22 is sent to comparator U42 where the error signal is converted into a pulse width modulated PWM signal by comparing with a sawtooth input This output is sent through photocouplers to the P...

Страница 59: ...r Second 24 FPS 240 PPS 30 FPS 300 PPS 48 FPS 480 PPS 60 FPS 600 PPS 120 FPS 1200 PPS Table 5 4 Constant Velocity Rates for Film Speeds A direction signal is also supplied by the CPU These signals are...

Страница 60: ...e mode During slew operation the pulldown motor must be locked to the constant velocity motor so film moves smoothly through the film gate Figure 5 5 shows the pulldown circuit configured for slew ope...

Страница 61: ...plifier Card driving the Pulldown motor Figure 5 7 shows the timing relationships during the pulldown action Prior to time 0 on the diagram the film is in registration and is being illuminated by the...

Страница 62: ...et value The CPU rewinds four and one half frames and stops in registration A two second timeout stops the pulldown motor if there is no film in the projector and illuminates LED 3 on the keypad A fra...

Страница 63: ...applied in the take up direction The circuit is biased in such a manner that the input signal from the optical pot will be zero volts when the torque arm is at normal position independent of speed Th...

Страница 64: ...l Sensor is monitored using comparator U34 Transistor Q10 disables the PWM output in the Platter mode of operation The Sync Separator Card 0300 The Sync Separator card see Section 8 2 is used to extra...

Страница 65: ...gates and flip flops Control Circuitry much of which is described in Section 5 1 The CPU Section The CPU section of card 2293 illustrated in Section 8 7 uses a 6809 processor with a built in crystal...

Страница 66: ...PIAs and the ACIA and controls the PTM Based on the information received the processor sends the necessary control signals to the PIAs to operate the pulldown constant velocity and shutter motors A ph...

Страница 67: ...also Section 8 14 The EOF tape is detected by comparator U35A The output of U35A goes high while the tape is being detected it is input to the CPU through a PIA The BOF tape is processed in a similar...

Страница 68: ...1 inputs the Pulse Width Modulated signal to U5 U7 while U2 inputs the direction signal U3 and U4 activate bilevel drivers Q2 and Q3 Q1 is used to activate photocouplers on the 2293 card that limit cu...

Страница 69: ...errupt routines with background routines for less time critical functions provides the speed required for projector operation along with the robustness of full command functionality Fail safe hardware...

Страница 70: ...ety Check Douser Char Keybd Warning Indicate Fault Set to Not Ready Execute Command Yes No Yes No Yes No Yes No INTRPT Shutter Yes No Do Pulldn Yes No Pulldown at Cine Speed Fwd CV Int Do Pulldn Yes Y...

Страница 71: ...a part has been accidentally disturbed The order and grouping of the adjustments in this section represents the typical approach to the projector and is related to the diagnostic approach embodied in...

Страница 72: ...8 7 These sensors operate by detecting either the amount of light reflected from the film non active or a piece of FORMLINE silver tape attached to the film active The tape should be 3 8 inch wide it...

Страница 73: ...6 M e c h a n i c a l a n d E l e c t r o n i c A d j u s t m e n t s CHRISTIE CHRISTIE 35 70 Service PM Manual March 1997 Tape may not be seen through the film if it is placed on the base side...

Страница 74: ...vision horizontally and 1 0 volts per division vertically Set the trigger to automatic If using a voltmeter set the scale to 20 Volts 2 To adjust the BOF sensor voltage adjust VR7 for a level of 2 0 V...

Страница 75: ...stop 3 Remove the disk sensor cover 4 Loosen the locking screws so that the sensor assembly can be moved with respect to the disk See Figure 6 2 5 Loosen the set screw holding the disk to its shaft 6...

Страница 76: ...the upper torque arm sensor voltage as measured from the top of R149 is 0 volts 1 volt This adjusts lower torque arm position 5 Repeat steps 3 5 with speed values of 20 30 40 50 60 70 and 80 6 Enter...

Страница 77: ...itter free picture while running cine forward Both a 90 degree and a zero degree signal are used to form a biphase signal that locks the pulldown sprocket to the constant drive sprocket during slew mo...

Страница 78: ...d E l e c t r o n i c A d j u s t m e n t s CHRISTIE CHRISTIE 35 70 Service PM Manual March 1997 Pulldown Signal TP13 Figure 6 4 a Pulldown Signal Gain Too Low Pulldown Signal TP13 Figure 6 4 b Pulld...

Страница 79: ...ly power to the lamphouse strike the lamp and power the projector Enter a READY command hit the READY key 3 Slightly loosen the two screws securing the pulldown sensor card 4 Enter a FORWARD command t...

Страница 80: ...cope to pin 3 of U19 The phase relation should be about 90 degrees as shown in Figure 6 6 The quadrature relationship is required when the projector executes high speed slew motion operations If adjus...

Страница 81: ...refer to the 35 70 Power Supply component layout in Section 8 4 240 VAC Operation To configure the 35 70 projector for 240 VAC operation 1 Remove the jumper from terminals 1 3 and 2 4 on T1 and the ju...

Страница 82: ...the outer edge of the rail on the fixed film gate Movable Gate Stop Adjustment The gate stop can be moved in or out by first back threading the 20 socket cap screw then adjusting the stop limit set s...

Страница 83: ...s and knobs are tightened against the flats on the shafts 7 Install the 35mm C V sprocket pad shoes on the upper and lower C V sprockets Insure that the gap between the Delron pad and the sprocket is...

Страница 84: ...isolates the particular failures or mis adjustments that can cause the condition Repair or adjustment is described to allow the technician to repeat the sequence progressing to the next abnormal cond...

Страница 85: ...d to identify any open connectors loose film guides failed bearings broken belts etc See Tables 7 2 7 3 and 7 4 Correct any deficiencies found in the visual check Step 2 This step is described in Sect...

Страница 86: ...The click from the limit switch should be audible near the relaxed end of the arm motion A2 Verify that all Guide Rollers rotate freely with a minimum of lateral play Note that the Torque Arm Rollers...

Страница 87: ...B3 Gently verify Lower Torque Sensor and Disk 34 are tight B4 Verify that the four belts are undamaged and properly tensioned B5 Verify Upper and Lower Brakes 2 31 are engaged and that there is no pla...

Страница 88: ...1 None of the control lights comes on Step Diagnostic Result 1 Verify 5 volt supply is correct at J1 of the 2267 card in the control panel head If not determine fault and repair 2 Verify that the ribb...

Страница 89: ...vates 3 Visually verify that the Upper and Lower Torque Arms move to centered position and that the reel brakes are released Verify that system is stable reels do not oscillate 4 Visually verify that...

Страница 90: ...the LED still remains lit proceed to Step 3 3 The 2267 keypad or the 2293 CPU Main Logic card could be defective Repair or replace as necessary 1 2 LED is on CONDITION 2 LED 5 is on Step Diagnostic R...

Страница 91: ...if necessary 5 If the LED still remains lit the 2267 keypad or the 2293 CPU Main Logic card could be defective Repair or replace as necessary 1 4 LED is on CONDITION 4 LED 2 is on Step Diagnostic Resu...

Страница 92: ...e lower torque 2285 amplifier card and READY relay are not damaged and are correctly plugged in 3 Verify that the time delay relay contacts on K2 in the power supply are closing approximately 3 second...

Страница 93: ...volts as arm is moved to its extremes zero volts should be near the center of travel Readjust if necessary 3 Monitor supply voltage at the plus side of the 2285 card as the READY button is pushed This...

Страница 94: ...embly are correct The spring tension adjustment should be checked and corrected if necessary See Section 6 3 3 Oscillation could indicate worn brushes in the Torque motor or tacho generator assembly R...

Страница 95: ...1 Check the 8 amp fuse fuse 1 associated with the 34 volt supply of the Pulldown system Verify that the 34 volt supply does reach the 2275 card 2 Verify that the input to the 2275 card at R102 or at T...

Страница 96: ...e film one frame and lock CONDITION 2 The constant velocity sprocket turns with enough force or speed to trip the buckle switch or damage film Step Diagnostic Result Replace the 2285 card 5 3 The Cons...

Страница 97: ...m and lock Since a Loop Set was performed in Section 3 of this table those checks need not be repeated CONDITION 1 Pulldown sprocket offers no resistance to movement by hand Step Diagnostic Result 1 R...

Страница 98: ...ure determine wiring fault or defective encoder and repair or replace b If shutter is not moving continue to step 4 4 Verify the reference frequency at TP33 of the 2293 card This square wave should ha...

Страница 99: ...by pushing the button sequence CMD H 3 Checklist Item Step Description Completed Verify that the film accelerates to 120 frames per second in a smooth and linear motion B Push the STOP button and afte...

Страница 100: ...N 2 Film ramps up smoothly to maximum speed but upper loop is lost while going forward Step Diagnostic Result 1 Verify that the Constant Velocity Tach voltage reaches the 2293 card If not repair wirin...

Страница 101: ...ower Torque Arm assemblies are equal and at their proper value An imbalance puts excessive load on the Constant Velocity system Readjust if necessary See Section 6 3 A 5 Film does not ramp smoothly to...

Страница 102: ...utton After film speed stabilizes enter the C 3 command to cause the douser to open Checklist Item Step Description Completed 1 Verify that the film accelerates to the pre programmed film rate in a sm...

Страница 103: ...e secure in their sockets Verify that the douser relay does function Determine bad solenoid or wiring fault and repair or replace 2 If relay does not function determine if fault is the driver on the 2...

Страница 104: ...at least one quarter turn to produce one high going pulse If pulse is not present trace to the 2276 card and finally to the pulldown sensor to determine failure point Repair wiring fault or replace 22...

Страница 105: ...just if necessary See Section 6 5 4 It is possible for a Pulldown amplifier to have defective output transistors and function in all modes except Pulldown Replace 2275 card 5 It is possible for one of...

Страница 106: ...sary unless parts associated with the shutter system have been replaced 2 If the shutter ghosting adjustment must be made on a regular basis verify that all mechanical parts are properly tightened A l...

Страница 107: ...l Pot Assembly 0208 Optical Sensor Assembly 0300 Sync Separator 1008 Frame Counter Display 1034 Power Supply Assembly 2262 Bi Level Interface 2267 Keypad 2268 Pulldown Sensor 2269 Shutter and CV Encod...

Страница 108: ...S E C2 REVERSE C3 OPEN DOUSER CINE C4 CLOSE DOUSER SLEW C5 CLEAR CUES SET LOOP C6 SET LOOP C7 OUTPUT STATUS CUE C8 CUE C9 JAM READY CA READY NOT READY READY CA DISPLAY REEL COUNTER READY NOT RDY CB NO...

Страница 109: ...RROR HC PULLDOWN GAIN DISPLAY READY HC BRAKE RELEASE NOT READY HD SET MAX SHOWS HE LOCAL MODE HF DISPLAY START G0 MEMORY INSPECT G1 DISPLAY FRAME COUNTER G2 SELECT FRAME RATES G3 AUTO DOUSER G4 LOAD R...

Страница 110: ...A p p e n d i x A R S 2 3 2 C o m m a n d P r o t o c o l CHRISTIE INC Service PM Manual July 1997...

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