International Tapetronics Corporation 770 Series Technical Manual Download Page 1

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Summary of Contents for 770 Series

Page 1: ...www SteamPoweredRadio Com TECHN CAL MA UAL 770 SER ES REEL TO REEL REPRODUCER 25HZDETECTOR lnTERnATIOnAL TAPET on1cs CORPORATIOn 2425 So th Mai Street Bloomington Illinois 6 70...

Page 2: ...RODUCER 25 Hz DETECTOR tnTERnATIOnAL TAPETROnlCS CORPORATIOn 2425 SOUTH MAIN STREET BLOOMINGTON ILLINOIS 61701 OCopyright 1981 lnternaUonal Tapetronics Corporation Made under one or more of the follow...

Page 3: ...t at the time of crisis when equipment malfunction is suspected When this happens the manual is usually missing or at best difficult to locate PLEASEFIND A CONVENLENT SPOT TO KEEP THIS MANUAL We at IT...

Page 4: ...7mm thick aluminum tool plate deck for stability equipped with a unique high quality professional head assembly utilizing two induction torque motors for supply and take up reel handling and a D C se...

Page 5: ...nt Operating Temperature 16 Remote Control 17 Brakes 18 External Connectors 19 Dimensions 20 Weight E Warranty 1 2 F Options and Accessories 1 2 SECTION II INSTALLATION A Unpacking and Handling 2 1 8...

Page 6: ...5 ips c 15 ips B Electrical 4 6 1 Reproduce Head Azimuth and Phasing 4 6 2 Reproduce Amplifier Equalization 4 8 3 Reproduce Amplifier Level 4 8 4 Infrared Tape Sensor 4 8 5 Capstan Motor Speed Change...

Page 7: ...ense 1 Component Loading and Overlay 8 13 2 Schematic 8 14 3 Parts List 8 15 SECTION IX 25 Hz DETECTOR OPTIONAL A Introduction 9 1 1 General Description 9 1 2 Specifications 9 1 a Input lmpedence b Se...

Page 8: ...www SteamPoweredRadio Com F Electrical Drawings and Parts List 1 Component Loading and Overlay 9 6 2 Schematic 9 7 3 Parts List 9 8 viii...

Page 9: ...ressure Roller Pressure Adjustment Adjusting the Solenoid Plunger Proper Height of the Reel turntable The Split Collar Gauge Inserting the Split Collar Gauge Brake Assembly and Adjustment Points Slip...

Page 10: ...atic Power Supply Cage Wiring layout Reproduce Amplifier Component loading and Overlay Reproduce Amplifier Schematic Switchcard Component Loading and Overlay Switchcard Schematic Motion Sense Componen...

Page 11: ...e azimuth pivot point is located directly behind the center of the head in both 1he vertical and horizontal plane This feal ure permits azimuth adjustment without disturbing the zenith or height adjus...

Page 12: ...red to or set out herein This war ranty applying only to the original user extends from date ofshipment for a period oftwoyears No claimshall be maintained hereunder unless written notice is re ceived...

Page 13: ...for the 770 Series is shipped separately and requires minor assembly upon receipt After Temoving the console from the packing mate rial install the four casters in the bottom of the console legs Set t...

Page 14: ...power cord G FUNCTIONAL CHECKOUT 1 Plug the unit in and turn the ON OFF switch to the ON position The capstan motor should rotate clockwise as viewed from the front 2 Push REWIND FORWARD STOP and RUN...

Page 15: ...e left of the magnetic heads ActivatingtheSTARTSWITCH putsthetrans port in the run mode at the selected speed When the start switch is pressed full torque is momentar ily applied to the forward reel m...

Page 16: ...h until the tape motion has ceased and then activate rhe stop switch immediately lo set the mec hanical brakes 5 The POWER switch either applies or removes power to the machine A 6 The SPEED swi1ch co...

Page 17: ...ics housing on the back of the 770 Series deck CAUTION RE MOVE POWER CORD FROM SOCKET BEFORE ADJUSTING RESISTORS While the torques are being measured thereel motor not being used should beheld station...

Page 18: ...airpot until the tape does not lose con tact with the heads Please note that the airpot has an effective range of approximately one quarter of a turn Therefore make thisadjustment cautiously as a smal...

Page 19: ...required when torquemotormaintenance is performed and otherparts have been replaced or adjusted Turntable height ad justment may also be required to adjust the machines ability to wind tape in the ce...

Page 20: ...ay toward the torQue motor least spring tension 2 Insert a 1 64 0 4mm thickpieceofcardboard about the thicknessofa matchbook cover or ITC brake gauge 830 0036 001 between the brakecoil and the inner d...

Page 21: ...eck plate surface The alignment tool Part Number 830 0022 021 may be used for this adjustment See Figure 4 14 c Coarse Zenith Adjust the rear height screw RH until the face of the head is perpendicula...

Page 22: ...Figure 4 17illustrates the adjustment points for each tape speed 4 6 low PHO ADJUST 1 4 IPSI __ MEDIUM SPEED AOJU T 1 1 2 PSI t111 1HG PHO DJIIST H IPSI TENSION AR AIR OAMPl G A0Jll T Figure 4 17 CAP...

Page 23: ...observe if phase shift has occurred Use Fig ures 4 18 4 l9 4 20 and 4 21 as references If phase shift has occurred adjust the azimuth screw A to correct this phase shift For example If the pattern in...

Page 24: ...ches It isaccessible by removing the front switch dress panel Should adjustment ofthis control be necessary remove the switch dress panel by removing the four Phillips headscrewsholdingit in place Thr...

Page 25: ...direction Refer to the Reproduce Amplifier PCB drawing for the location of this transistor NOTE Ifyour unit is a recorder reproducer a corresponding Recording Amplifier componenl arrangement is utiliz...

Page 26: ...n the tape path Allow all cleaning fluid to dry before rethreading tape onto the machine to reduce the possibility of damage to the tape Do not allow cleaning fluid to enter the bearings in the pressu...

Page 27: ...use D SPARE PARTS Your new 770 Series Reel to Reel unit was shipped with a Maintenance Parts Price List enclosed in the front of this Technical Manual We sincerely hope you never have to replace part...

Page 28: ...telephone conversations ITC will gladly repair the defective item and return it to you All we require is notifica tion from you that the item will be returned 0381 LC 3 When returning an item or mach...

Page 29: ...d Q301 will 0381 PD turn off Trim pot R302 is used to adjust for op11 mum photo sensor sensitivity with various thick ness and varieties of tape and leader Capacitor C301 and resistor R306 form an R C...

Page 30: ...ntrol R219_This potentiometer has a limited range of approximately t8 dB 4 dB from the e vertical position_Because of this audio performance of Lhe amplifier is uniform Audio is coupled to the base of...

Page 31: ...es with the latch circuit to ground for these relays If not forward biased it will prevent K101 0381 PD and Kl02 from remaining energized Forward bias for Q107 is removed through diode CR107 whenever...

Page 32: ...y Bl k tape lifter Record oc Rubber bumper hp Plate dress Play only Plate dress Play Record Escutcheon 770 h 6 fiber 1 4 O D Was er6 32 x 5 16 Phillips pan Screw black l l 2 button head 0 Screw 10 32...

Page 33: ...head Disc turntable Washer turntable anti skid Screw 4 40 x 1 2 sh cap black Reel retainer black Array motion sense supply side only HEAD COVER ITEM NO PART NO DESCRIPTION 0381 HTD SDT 1 2 3 4 5 350...

Page 34: ...andoff bearing Washer 812 O D x 193 I D x 021 thick Washer 437 O D x 193 1 D x 007 thick Bearing ball tape guides SKF 6262 Tubing plastic clear 1 4 dia x 3 16 Cap bearing black Screw 10 24 x 7 8 B H s...

Page 35: ...teamPoweredRadio Com 0381 HTD CAPSTAN MOTOR ITEM NO PART NO DESCRIPTION 350 1034 000 Screw 10 32 x 1 1 2 button head socket cap black 2 313 010 001 Collar motor mounting 3 455 0003 003 Motor Nidec DCB...

Page 36: ...2 0720 000 832 0710 000 455 0003 003 DESCRIPTION Deck Switch card assembly Power transformer assembly w harness Motion sense assembly Dash pot and foil sense assembly Electronics assembly Solenoid pre...

Page 37: ...www SteamPoweredRadio Com...

Page 38: ...0001 000 7 7 DESCRIPTION Solenoid assembly with plunger rront mount bracket Washer IH0 x 1 2 flat ZP Bearing ball Screw 10 24 x 5 8 Phillips pan head ZP Chain ladder 5 links Tubing l 4H clear Screw 1...

Page 39: ...18 350 0810 000 Screw 8 32 x 5 8 Phillips pan IC 301 0051 000 Spring compression 1D 837 0018 000 Armature assembly 1 837 0019 000 Roller clutch assy R H supply with red dot 837 0020 000 Roller clutch...

Page 40: ...f 4 40 x 3 16 x 13 16 hex female em ale 300 0080 001 Standoff 6 32 x 1 4 hex x 1 2 male male 384 0003 000 Header solder 26 wire flat cable 431 0010 000 Cable ribbon 26 C scotch 3302 26 384 0004 000 Pl...

Page 41: ...3 4 5 I POWER TRANSFORMER PART NO 526 0015 000 376 0039 000 350 0410 000 365 0401 000 350 0804 000 DESCRIPTION Transformer Terminal strip Smith 3010 Screw 4 40 x 3 8 Phillips pan head Washer 4 int lo...

Page 42: ...1 4 x 1 4 male male 2 831 0229 002 Motion sense P C board 3 300 0085 000 Standoff 6 32 x 3 4 x 1 4 hex fe male female 4 370 0601 000 Nut 6 32 x 1 4 hex ZP 5 297 0021 001 Shield motion sense 6 350 060...

Page 43: ...THOUT MOTION SENSE 4 15 IPS 7 1 2 IPS USE JUMPERS H TOH ANO L TO M 7 1 2 IPS 3 3 4 IPS USE JUMPERS H TO M ANO L TO L 5 WI THOUT MOTION SENSE USE JUMPERS A TO B ANO E TO O WITH MOTION SENSE USE JUMPER...

Page 44: ...l l llt 10 l U US J OltS lt 110 1 ltV IO AIU lit Ml It SAlflllN S N R AUOltO Olt ec v t SOl tOA r 1 I I I I I I I I I I I I I I I t 4 YOC t C IO t IN400 t CIOS t zoo Y1 C 101 u oo c 101 11 11 U DO 20...

Page 45: ...et CR102 575 0007 000 lN 4005 J4 380 0007 000 6 pin socket C R103 575 0022 000 MDA 206 bridge rectifier 613 0002 000 TO 3 socket for VRl CR104 575 0007 000 lN 4005 JS 380 0125 000 11 pin socket CR105...

Page 46: ...hm 1 2 watt carbon film comp Rl02 630 0047 000 220 ohm 1 4 watt carbon Rl30 638 0007 000 lK ohm 12 watt adjustable film Rl31 628 0189 000 75 ohm 8 watt wire wound Rl03 628 0179 000 50 ohm 20 watt wire...

Page 47: ...BER TBI 3 76 003 9 000 T B 2 376 0003 000 Fl 4 18 000 1 000 4 17 0007 000 LI NE CORO 443 000 1 0 00 311 000 3 000 J 2 38 0 0007 000 J 3 380 000 1 000 J4 380 000 7 000 ERA SE a 3B0 00 48 000 RE CCR 0...

Page 48: ...208 C2 06 JI filw C22 6 ifil Tiill ill C209 u E LC 1 ffiill Q203 C2 12 Q204 C2I3 R2 27 R2 22 CB Q207 0 20 5 BE ill R2 2 8 C2I4 Q206 22 21 20 19 18 17 16 15 14 13 1 2 11 10 9 8 7 6 5 4 3 2 I PLAYBACK A...

Page 49: ...30 47 0 10K 150 T C211 2 2 K 4700 I 0027 I I I L _ _J ON 3 3 4 I PS ONLY lr y I __ R242 R 239 4 7 820 0 l C226 Jorn R229 R 2 34 R 2 43 R2 50 4 7K 2 2 00 i K f 4 70 1000 R 256 100 GES58I 6 C2 1B l 30 0...

Page 50: ...220 uFd 25v electrolytic 100 uFd 12v electrolytic 4 7 uFd 35v tantalum 300 pFd 300v silver mica 300 pFd 300v silver mica 01 uFd 200v pacer 100 uFd 12v electrolytic 4 7 uFd 35v tantalum 4 7 uFd 35v tan...

Page 51: ...0107 000 68K ohm 1 4 wait carbon film film R245 630 0043 000 150 ohm 1 4 watt carbon R213 630 0087 000 l0K ohm 1 4 watt carbon film film R246 630 0071 000 2 2K ohm 1 4 wat1 carbon R214 630 0031 000 4...

Page 52: ...SteamPoweredRadio Com 8 10 0 I u I d c J 0 I i z z 0 SWITCHCARD COMPONENT LOADING AND OVERLAY 0 a c o a O 0 01 o o X N 00 I I ii l a 0 c m z 0 0 I z 0 IE I I z z 0 0 E 0 0 I c 0 c z _ 0 x c 0 ill 0381...

Page 53: ...220K R307 1501 C301 I 1 ALL RESISTORS ARE 1 I WATT DESIGNATED IN OHMS UNLESS OTHERWISE M ARKED 2 ALL CAPACITORS ARE DESIGNATED IN MICROFARADS UNLESS OTHERWISE M ARKED 7 3 W E RESERVE THE RIGHT TO MAKE...

Page 54: ...carbon film 2 2K ohms 1 4 watt carbon film 220K ohms 1 4 watt carbon film 150K ohms 1 4 watt carbon film 2 2K ohms 1 4 watt carbon film lK ohms 1 4 watt carbon film Transistor Q30J 590 0022 000 2N603...

Page 55: ...www SteamPoweredRadio Com 8 13 C I tao J MOTION SENSE COMPONENT LOADING AND OVERLAY 0 a l 0 m 0 Cl w C I 0 zO w 0 C I z C I oO __ Of C Q 0381 SOT...

Page 56: ...I T I I lu40IA 7 V R408 I OOK R409 IOOk R410 1001 R404 33K R4fl IOOK I ALL RESIS TORS ARE f 4WATT DESIGNATED I N OHMS UNLESS OTHERWISE MARKED 2 ALL CAPACITORS ARE DESIGNATED IN MICROFARADS UN LESS OTH...

Page 57: ...N oted R401 630 0252 000 360 ohms 1 2 watt carbon film R402 630 0255 000 470 ohms 1 2 watt carbon film R403 630 0111 000 lO0K ohms 1 4 watt carbon Him R404 630 0099 000 33K ohms 1 4 wait carbon film...

Page 58: ...ne Message E O M Stop pulse sinking 0381 OM ground switching for 500 m sec Activates as sinking Delayed Machine Stop pulse ground switching for 500 m sec after 5 to 5 5 sec variable delay Available up...

Page 59: ...back deck through PlOl 5 1 DETECTOR CIRCUIT A 25 Hz subaudible tone is separated from all other frequencies through the application of active filters constructed around a quad operational am plifier T...

Page 60: ...hould always be used to limit rile sensitiuity of the detector and not to needlessly enhan ce it 0381 DM 3 STOP DELAY ADJ UST When the stop delay option is used on the detector card a control is provi...

Page 61: ...RT SWITCH 111 8 RUN LAMP REWIND LAMP FAST _I_FORWARO SWITCH FAST FORWARD LAMP TO KIO COMMON CONTACTS NORMALLY CLOSED L NORMALLY OPEN Figure 9 1 S10P DELAY J I a D ODD I REMOTE X 16 2 x 6 0 f igure 9 2...

Page 62: ...PART NO 300 0009 000 350 0605 000 831 0116 003 365 0602 000 300 0040 000 281 0033 003 DESCRIPTION Spacer 6 32 x 1 1 4 x 1 4 hex Screw 6 32 x 1 4 Phillips pan int Sems 25 Hz detector card Lock washer...

Page 63: ...www SteamPoweredRadio Com 9 6 25 Hz DETECTOR PC BOARD 831 01 16 003 Printed Circuit Card 25 Hz Detector 831 0116 003 0381 SOT...

Page 64: ...P A B FOR ENO OF TONE S TOP SlRAP A C FOR OE LAVE D 5 1 0P A F TER END OF TON E Cl 07 CI08 4 7 4 7 R I II If 3 3K RI 14 2 2K Rl 2 1 1 00 CR IO I 7 I N4 0 05 CRl 03 l N 4 005 Vl CR I0 4 I N 4 005 r kJl...

Page 65: ...590 0018 000 Transistor 2N5817 PNP R121 630 0039 000 Resistor 100 ohms l 4 watt Ql04 590 0017 000 Transistor 2N5816 NPN film Ql0S 590 0017 000 Transistor 2N5816 NPN Rl22 630 0063 000 Resistor lK ohms...

Page 66: ...0007 000 47 ufd 20V Tantalum R141 630 0079 000 Resistor 4 7K ohms 1 4 C113 694 0007 000 47 ufd 20V Tantalum watt film Cl14 694 0002 000 10 ufd 20V Tantalum Rl42 630 0127 000 Resistor 470K ohms 1 4 Cl...

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