Ampex-ATR-700-Service-Manual-1977.10 电路图 维修手册.pdf

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1、AMPEX AUDIO-VIDEO SYSTEMS DIVISION ATR-700 RECORDERIREPRDDUCER OPERATION AND MAINTENANCE CATALOG NO. 4890410-02 ISSUED: OCTOBER 1977 ATR-700 RECORDER/REPRODUCER OPERATION AND MAINTENANCE AMPEX CORPORATION AUDIO-VIDEO SYSTEMS DIVISION Catalog No. 4890410 -02 lssued: October 1977 PARAGRAPH NO. 1-1 1-2

2、 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 3-11 3-12 3-13 3-14 3-15 3-16 4-1 4-2 4-3 4-4 4-5 AMPEX 4890410-02 TABLE OF CONTENTS TITLE SECTION 1 GENERAL INFORMATION Description Specifications SECTION 2 INSTALLATION Unpacking and Inspection Installation Site Rack Mou

3、nting AC Voltage and Frequency Conversion Initial Connections Input Connections Output Connections Verification of Connections Optional Modification for Line Output Metering. SECTION 3 OPERATION Contrais and I ndicators Pre-Operating Procedures. Reel Installation Small Hub Reels Large Hub Reels Hold

4、down Knob Spacer Removal Threading the Tape Operating Procedures Recording Synchronous Reproduce Recording. MIC Recording. MIC-LINE Mixing LINE-LINE Mixing Reproducing Editing. Erasing. SECTION 4 THE ORY OF OPERATION Tape Transport Theory Sequence of Operation for Each Mode. Play Mode Fast Forward M

5、ode Fast Rewind Mode PAGE NO. 1-1 1-2 2-1 2-1 2-4 2-4 2-6 2-6 2-6 2-6 2-10 3-1 3-12 3-12 3-12 3-12 3-13 3-14 3-14 3-14 3-17 3-17 3-18 3-18 3-18 3-19 3-20 4-1 4-1 4-1 4-1 4-2 iii PARAGRAPH NO. iv 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 4-18 4-19 4-20 4-21 4-22 4-23 4-24 4-25 4-26 4-27

6、 4-28 4-29 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-10 5-11 5-12 TABLE OF CONTENTS (Continued) TITLE SECTION 4 THEORY OF OPERATION (Continued) Record Mode Pause Mode . . . . . . . . . . . . . . Stop Mode . . ; . . . . . . . . . . . Reel Hub Size Selection . . . . . . . . . . Power Line Frequency Select

7、ion (50 Hz/60 Hz) Solenoid Drive Circuit . Rewind Stop Unit . EDIT switch. . . . Signal System Theory Reproduce Operation Reproduce Equalizer Amplifier Reproduce Une Amplifier . Buffer Amplifier . . . . . . Une Output/Phone Amplifier Synchronous Reproduce Operation _ Record Operation 1 nput Selector

8、 . Mix Une Amplifier Record Amplifier. Bias Oscillator . Meter Amplifier/Stabilizer Switchboard A. Switchboard B . Head Select PWA. SECTION 5 MAINTENANCE Test Equipment Cleaning . Demagnetizing Lubrication . Pinch Roller. Capstan Shaft Digital Counter Roller Electro-Mechanical Checks and Adjustments

9、 Panel Removal . . . . . . . . . Capstan Shaft Tolerance Adjustment . Coarse Head Adjustment . . . . . . . Pinch Roller Pressure Check and Adjustment PAGE NO. 4-2 4-2 4-2 4-2 4-2 4-9 4-9 4-9 4-10 4-10 4-10 4-10 4-14 4-15 4-15 4-15 4-15 4-16 4-17 4-18 4-18 4-18 4-23 4-23 5-1 5-2 5-2 5-3 5-3 5-3 5-4 5

10、-4 5-4 5-5 5-5 5-6 AMPEX 4890410-02 PARAGRAPH NO. 5-13 5-14 5-15 5-16 5-17 5-18 5-19 5-20 5-21 5-22 5-23 5-24 5-25 5-26 5-27 5-28 5-29 5-30 5-31 5-32 5-33 5-34 5-35 5-36 5-37 5-38 5-39 5-40 5-41 5-42 5-43 5-44 5-45 5-46 5-47 5-48 5-49 5-50 AMPEX 4890410-02 TABLE OF CONTENTS ConUnued) TITLE SECTION 5

11、 MAINTENANCE (Continued) Tension Measurements and Adjustments Back Tension (Play Mode) Takeup Tension (Play Mode) . . . . Fast Winding Back Tension . . . . . . Fast Winding Tension . . . . . . . Brake Torque Measurement and Adjustment Brake Band and Drum Clearance Adjustment Performance Tests . . .

12、. . . . Test Equipment . . . . . . Tape Speed and Wow Flutter Test Reproduce Signal-ta-Noise Ratio . Reproduce Frequency Response Overall Frequency Response Overall Signal-ta-Noise Ratio . Electrical Checks and Adjustments DC Voltage Adjustment . . . Tape Speed Adjustment . . . . Reproduce Head Alig

13、nment. . Reproduce Output Level Setting VU Meter Setting. . . . . . F requency Response . . . . . Reproduce Signal-ta-Noise Ratio . Headphones Output Level Monitor Performance Checks LIN E Input Level Check . MI C Input Level Check Record Adjustments . . . Bias Trap Adjustment (Record) Bias Trap Adj

14、ustment ( Reproduce) Bias Setting Adjustment (Position 3) Record Level Set . . . . . Frequency Response Adjustments Bias Setting at Position 3 Bias Setting at Position 2. Bias Setting at Position 1 Dummy Coil Adjustment. Overall Signal-ta-Noise Ratio D istortion Check . . . . PAGE NO. 5-7 5-7 5-10 5

15、-11 5-12 5-12 5-14 5-14 5-15 5-16 5-17 5-17 5-18 5-18 5-20 5-20 5-20 5-21 5-22 5-23 5-23 5-23 5-25 5-26 5-26 5-26 5-27 5-27 5-27 5-27 5-28 5-28 5-28 5-28 5-28 5-29 5-29 5-29 PARAGRAPH NO. vi 5-51 5-52 5-53 5-54 5-55 5-56 5-57 5-58 5-59 TABLE OF CONTENTS (Continued) TITLE SECTION 5 MAINTENANCE (Conti

16、nued) Erasure. . . . Crosstalk . . . Replacement of Parts Head Assembly and Head Replacement Capstan Motor Replacement . . . . Replacement Capstan Motor with Different Speed. . . . Reel Table Replacement and Height Adjustment. Reel Motor Replacement . Troubleshooting . . . . . . . . . . . . . . SECT

17、ION 6 PARTS LISTS AND SCHEMATICS List of Assemblies and Schematics . . . . . . . PAGE NO. 5-30 5-30 5-31 5-31 5-32 5-33 5-33 5-34 5-35 6-ii AMPEX 4890410-02 LIST OF ILLUSTRATIONS- FIGURE NO. TITLE PAGE NO. 1-1ATR-700 External Dimensions 1-6 2-1Unpacking the ATR-700 2-2 2-2 A TR-700 in Upright Positi

18、on 2-3 2-3Rack Adapter Installation 2-4 2-4 Screw Locations for Panel Removal . 2-5 2-5Voltage and Frequency Conversion 2-7 2-6Voltage Conversion Plug 2-8 2-7 50 Hz/60 Hz Frequency Conversion Switch. 2-8 2-8Rear Connecter Panel 2-9 2-9 Rear Connecter Panel - Initial Connections 2-9 3-1 Reel Table Sp

19、indle 3-13 3-2Large Hub Reel Installation . 3-13 3-3Tape Threading Path 3-15 4-1 Control Unit Schematic 4-3 4-2 Power Supply Schematic 4-4 4-3Timing Diagram 4-5 4-4Switchboard A Schematic 4-8 4- 5Signal System Black Diagram 4-11 4-6Signal Level Diagram 4-12 4-7Reproduce Equalizer Amplifier Schematic

20、 4-13 4-8Reproduce Line Amplifier Schematic 4-15 4-9Output/Phone Amplifier Schematic . 4-16 4-10Output Transformer PWA Schematic 4-17 4-11Input Selector PWA Schematic 4-19 4-12Mix Une Amplifier Schematic. 4-20 4-13 Record Amplifier Schematic 4-21 4-14Bias Oscillator Schematic. 4-22 4-15 Meter Arn pl

21、 ifier/Stabilizer Schematic 4-22 4-16Switchboard B, C Schematic 4-24 4-17 Head Assembly Schematic 4-25 5-1 Lubrication Points 5-3 5-2 Digital Counter Roller Location 5-4 5-3Digital Counter Roller Lubrication 5-4 5-4Connecter Panel Screws . 5-5 5-5 Capstan Shaft Tolerance Adjustment 5-6 5-6 Head Alig

22、nment 5-7 5-7 Tape Positioning for Head Afignment 5-8 AM P EX 489041 0-02 vii FIGURE NO. 5-8 5-9 5-10 5-11 5-12 5-13 5-14 5-15 5-16 5-17 5-18 5-19 5-20 5-21 5-22 5-23 5-24 5-25 5-26 5-27 5-28 5-29 viii LIST OF ILLUSTRATIONS (Continued) TITLE Pinch Roller Pressure Measurement . Pinch Roller Mounting

23、Screws Location . Pinch Roller Adjustment Screw Location Pinch Roller Pressure Adjustment . . . Tension Measurement . . . . . . . . Torque and Tension Adjustment Resistors Torque Measurement . . Brake Assembly . . . . ASA A Weighted Filter Test Connections . . . . DC Voltage Adjustment . Tape Speed

24、Adjustments . Locations of Electrical Adjustments L701 Dummy Coil . . . . Head Assembly Removal . . Head Assembly Connectors . Head Disassembly Capstan Motor Removal . . Reel Table Removal. . . . Reel Height Adjustment . . Reel Motor Assembly Removal Troubleshooting Flow Chart . PAGE NO. 5-8 5-9 5-1

25、0 5-11 5-12 5-13 5-14 5-15 5-17 5-19 5-21 5-22 5-24 5-29 5-32 5-32 5-33 5-34 5-34 5-35 5-36 5-37 AMPEX 4890410-02 TABLE NO. 1-1 1-2 1-3 2-1 3-1 3-2 3-3 3-4 4-1 4-2 4-3 5-1 5-2 5-3 5-4 5-5 5-6 5-7 AMPEX 4890410-02 LIST OF TABLES ATR-700 Versions . . A TR-700 Specifications Accessories and Options Inp

26、ut Connections . . Operating Controls . . Input and Output Controls TITLE Head Housing and Tape Counter Controls Switch Settings for Normal Record and Reproduce Operations . . . Sequence of Output Signals in Control Unit State of Reproduce/Equalizer Amplifier Transistors for Various Tape Speeds and

27、Equalization Curves . State of Transistors in Record Amplifier for Various Speeds and Equalization Curves Test Equipment and Material . . . . . . Tension Measurements. . . . . . . . . Ampex Test Tapes . . . . . . . . . . RECORD Switch Settings for Four Types of Tape DC Voltage Test Points and Adjust

28、ments. . . . Frequency Response Limits. . . . . . . . . Frequency Response Adjustment Potentiometers PAGE NO. 1-2 1-2 1-5 2-10 3-1 3-7 3-10 3-16 4-7 4-14 4-23 5-1 5-11 5-16 5-19 5-20 5-25 5-25 ix I ; r: I Tl ATR-700 Recorder/Reproducer X AMPEX 4890410-02 SECTION 1 GENERAL INFORMATION This manual con

29、tains general information, instal- lation, operation, theory of operation, and main- tenance information for the ATR-700 Recorder/ Reproducer, Ampex Part No. 4010270-4010275. (See Table 1-1 for configuration/part number information.) Parts lists and schematics are also included in the last section o

30、f this manual. The first section of this manual contains general description and specifications for the A TR-700. 1-1. DESCRIPTION The ATR-700 is a highly reliable, professional audio magnetic tape recorder/reproducer designed for use with 1/4-inch tape and 5, 7, or 10-1/2-inch reels. It is availabl

31、e in six versions; all are switch- able between NAB and I EC equalization. Each unit offers two selectable speeds; 7-1 /2 and 15 in/s in the high-speed models, and 3-3/4 and 7-1/2 in/s in the low-speed models. The ATR-700 is available in three different head configurations; full track, two track, an

32、d quarter track with either one or two channel capability. All units include two channels of electronics, allowing easy conversion of full-track units to two track or quarter track operation. Table 1-1 shows the con- figurations of the six available versions. The electronics of the ATR-700 feature I

33、C logic control for error-free operation. Motion sensing logic allows changing from fast forward or rewind mode to reproduce mode smoothly and without tape spillage or damage. Reproduce mode begins shortly after the motion sensing circuitry deter- mines that tape motion has stopped. No preset or aut

34、omatic delays are necessary. The direct drive de servo capstan motor provides positive tape control unhampered by belts that could introduce wow and flutter or tape speed variations. AMPEX 4890410-02 The standard ATR-700 utilizes three heads: an erase head, a record head, and a reproduce head. A spa

35、ce is reserved on the right side of the head assembly for installation of a fourth head (a second reproduce head), which may be ordered as an option. Changing a head assembly is a simple operation and requires only minor adjustments. Two-channel versions feature the synchronous reproduce mode which

36、makes it possible to switch the record head of either channel to the reproduce mode for monitoring that channel. Thus, channels recorded at different times are in perfect synchron- ization. The two-channel ATR-700 has a built-in four-in/ two-out mixer (two-in/one-out for each channel). Four micropho

37、nes, four line inputs, or two micro- phones and two line inputs can be mixed down to two channels. For full-track models, two inputs can be mixed down to one channel. MIC ATT switches on the rear connector panel allow selec- tion of 20 dB of microphone input attenuation. In addition, the three-posit

38、ion RECORD LEVEL switch selects three levels of attenuation to the signal ( input or tape) fed to the vu meters, LINE OUT jacks, and headphones. This allows easy calibration changes to accommodate either con- ventional or high-energy tapes. A digital tape counter allows direct reading of the elapsed

39、 time in minutes and seconds when the higher tape speed is selected. (For lower tape- speed operation, the reading must be multiplied by two for actual elapsed time.) Tape editing is greatly simplified in the ATR-700. Pressing the EDIT button during reproduce mode disables the takeup motor and allow

40、s dumping of unwanted tape from the supply reel. The EDIT button also causes the tape lifter to be retracted to allow manual cueing in stop mode. A VARI- SPEED control can be used to vary tape speed by 1-1 i I Table 1-1. ATR-700 Versions AMPEX NUMBER OF TAPE PART NUMBER CHANNELS SPEEDS (IN/S) 401027

41、0 1 3-3/4 and 7-1/2 4010271 1 7-1/2 and 15 4010272 2 3-3/4 and 7-1 /2 4010273 2 7-1/2 and 15 4010274 2 3-3/4 and 7-1/2 4010275 2 7-1/2 and 15 5% in order to compensate for tonal variations of instruments recorded at different times. Other important features of the ATR-700 include: a rewind-stop MEMO

42、RY switch; full remote con- trol capability (using the optional remote control box); quick-lock reel hold down knobs; a flip-open head housing to facilitate editing and head main- tenance; a cue mode; a pause mode, to prepare for record or reproduce operation; and a universal power transformer which

43、 allows the ATR-700 to accept 100, 120, 220, or 240-Vac input at a frequency of either 50 or 60 Hz. HEAD SYNCHRONOUS CONFIGURATION REPRODUCE MODE Full Track No Full Track No Two Track Yes Two Track Yes Quarter Track Yes Quarter Track Yes 1-2. SPECIFICATIONS Table 1-2 gives specifications and perform

44、ance characteristics for the ATR-700 Recorder/Repro- ducer. These specifications are subject to change without prior notice. Table 1-3 gives accessories and options available with the ATR-700. Figure 1-1 shows ATR-700 external dimensions. Table 1-2. ATR-700 Specifications Tape Transport Tape recomme

45、nded: Tape width: Reel sizes: Reel hub size selector: Tape speed: Tape speed accuracy: Wow and flutter: 1-2 Ampex No. 456 (Grand Master) and No. 406, or equivalent. 1 /4 inch. 5, 7, 101/2 inch per ANSI and NAB standards. 2 positions: LARGE or SMALL reel hubs. Switchable two speed: 3-3/4 and 7-1 /2 i

46、n/s or 7-1 /2 and 15-i n/s. Adjustable pitch range 5%. Not field convertible between models. Within 0.3% at both speeds. 0.08% Wrms at 7-1 /2 and 15 in/s. 0.12% Wrms at 3-3/4 in/s. Weighting is NAB measured by the reproduce method. AMPEX 4890410-02 t i Table 1-2. ATR-700 Specifications (Continued) T

47、ape Transport (Continued) Shuttle time: Tape drive system: Capstan motor: Head configuration: Approximately 90 seconds for 1200-foot reel in either direction. Three-motor direct-drive. DC servo motor, direct drive. 3 heads for erase, record, and reproduce in 1-track 1-channel (has basic 2-channel el

48、ectronics), 2-track 2-channel, or 1/4-track 2-chan- nel. In addition to above, space is provided for a fourth head. Tape timer (with rewind-stop memory): Indicates in minutes and seconds to a maximum of 99 minutes and 59 seconds; indications are for the higher speed (7-1/2 or 15-in/s). Accuracy is w

49、ithin 10% max error. Manually defeatable tape lifter: Motion sensing: Operating position: Mounting: Transport controls: Remote controls: Safetv standard approval: Electronics: Line output: Maximum line input: Line input: Mic input: Maximum mic input (attenuator off): Input connector: AMPEX 4890410-02 Lever type for cueing. Circuit to detect complete stop of tape before going into