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OTARI MTR-90III Operation And Maintenance Manual

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Part No. OS3-304
MTR-90III
MASTER TAPE RECORDER
OPERATION AND MAINTENANCE MANUAL
FOURTH EDITION
Printed: September 1996
Ed. 4 (GK)

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Summary of Contents for OTARI MTR-90III

  • Page 1 Part No. OS3-304 MTR-90III MASTER TAPE RECORDER OPERATION AND MAINTENANCE MANUAL FOURTH EDITION Printed: September 1996 Ed. 4 (GK)
  • Page 2 Copyright © 1990, 1991, 1992, 1996 Otari, Inc. Printed in Japan This manual may not be reproduced by any means without written permission.
  • Page 3 CAUTION To prevent fire or shock hazard: Do not expose this unit to rain or moisture. Do not remove panels (unless instructed to do so). There are no user-serviceable parts inside. Refer servicing to qualified service personnel. PLEASE READ THROUGH THE SAFETY INSTRUCTIONS ON THE NEXT PAGE.

  • Page 4: Safety Instructions

    SAFETY INSTRUCTIONS Read Instructions All safety and operating instructions should be read before the device is operated. Retain Instructions The safety and operating instructions should be retained for future reference. Heed Warnings All warnings on the device and in the operating instructions should be complied with.

  • Page 5: Communication With Otari

    : (65) 284-4727 Another part of Otari’s continuing technical support program for our products is the continuous revision of manuals as the equipment is improved or modified. In order for you to receive the information and support which is applicable to your...

  • Page 7: Table Of Contents

    ..........v Section 1 Introduction 1.1 The Otari MTR-90III Tape Recorder ......1-2 1.2 Using This Manual...
  • Page 8 Table of Contents MTR-90III Operation and Maintenance Manual 4.2.8.2 Fast Cue Mode (Lifter Defeat) ......4-8 4.2.9 Spot Erasure .
  • Page 9 MTR-90III Operation and Maintenance Manual Table of Contents 6.1.4 Fast Forward/Rewind Damping Solenoid Adjustment ....6-7 6.1.5 Swing Arm Adjustment ......... . . 6-8 6.1.6 Tape Lifter Mechanism .
  • Page 10 9.14 Auto Locator Assembly (CB-148-S) ......9-30 Index Appendix A MTR-90III Master Tape Recorder Schematic Diagrams April 1992...
  • Page 11 Figure 7-1 MTR-90III Dimensions ....... . . 7-4 April 1992...
  • Page 13 List of Tables Table 2-1 SW1 on the TRANSPORT CONTROL PCA ....2-2 2-2 SW2 and SW3 on the TRANSPORT CONTROL PCA ..2-3 2-3 Reproduce EQ Selection: BIAS CONTROL PCA .

  • Page 15: Section 1 Introduction

    Section 1 Introduction This section introduces the MTR-90III Tape Recorder and explains the different parts of this manual. 1.1 The Otari MTR-90III Tape Recorder ......1-2 1.2 Using This Manual...

  • Page 16: The Otari Mtr-90Iii Tape Recorder

    MTR-90III Operation and Maintenance Manual 1.1 The Otari MTR-90III Tape Recorder The Otari MTR-90III records and reproduces 1" or 2" master tapes in an 8-track, 16-track or 24-track format according to the head assembly and the number of Audio PCB Assemblies. Tension is distributed uniformly across the tape surface by a pair of wide diameter pinchrollerless spindles, the capstan and the tachometer.

  • Page 17: Using This Manual

    Section 4 Operation: This section of the manual describes the operation of the MTR-90III. It contains a list of all the operating modes of the machine and an in-depth description of all MTR-90III operations organized by function. The functional checkouts in Section 2 should be carefully performed when the MTR-90III is first installed.

  • Page 18: Conventions Within This Manual

    We encourage you to read this manual carefully now, and to again review it after you have had a while to become familiar with the MTR-90III. The more you know about your machine, the more you can benefit from its many versatile features.

  • Page 19: Section 2 Installation

    Section 2 Installation Most MTR-90III units are unpacked and tested by local Otari dealers making the following unpacking and checkout procedures unnecessary. The MTR-90III Recorder, CB-147 Remote Control Unit, logic and power cables, brackets and other related items are shipped partially assembled.

  • Page 20: Inspection

    1. Inspect the equipment for any parts which may have become loose or damaged during shipping. 2. Check the plug-in PCB Assemblies in the card cages: A. Grasp the top of each door in the front of the MTR-90III and pull to open. CAUTION! The edges of the doors are very sharp.
  • Page 21 MTR-90III Operation and Maintenance Manual Section 2 Installation Table 2-1 SW1 on the TRANSPORT CONTROL PCA SWITCH FUNCTION EFFECT SW1-1 Hand Cueing Capstan ON: Defeats Stop Stand-by input switching, allowing audio to be monitored while hand cueing in Stop mode.
  • Page 22 Section 2 Installation MTR-90III Operation and Maintenance Manual Table 2-4 Cue Level Attenuation Selector: BIAS CONTROL PCA SWITCH POSITION TAPE SPEED AUDIO EFFECT AT WIND SPEEDS SW4 ON 15/30 ips Not Changed SW4 OFF 15/30 ips Attenuated All cards should be firmly seated in their mating connectors and in the correct locations.
  • Page 23 (The electrical connectors are mounted to sub-plates that remain attached to the MTR-90III chassis.) CAUTION: Be sure the AC power cable is not connected to the MTR-90III at this time. B. Check the following connectors and components to be sure they are firmly seated.

  • Page 24: Assembly Of Remote Control Unit

    Section 2 Installation MTR-90III Operation and Maintenance Manual 2.2 Assembly of Remote Control Unit The Remote Control Unit is provided with a stand for desk top use. The Remote Control Unit can be fitted with the angle adjusting knob for use at any convenient position.

  • Page 25: Stand Assembly (Remote Control Unit/Auto Locator)

    MTR-90III Operation and Maintenance Manual Section 2 Installation 2.3 Stand Assembly (for Remote Control Unit and Auto Locator) Refer to Figure 2-5 for the following instructions. 1. Remove the four pieces on the side of the Remote Control Unit. 2. Place the CB-147 Remote Control Unit panel upright on a flat work surface.

  • Page 26: Desk Top Stand Assembly

    Section 2 Installation MTR-90III Operation and Maintenance Manual 9. Insert the threaded screw of each knurled knob through the bearing flange and carrier block and screw it into the mounting flange, but do not tighten. 10. Notice that the carrier blocks are flat on one edge. The carrier blocks should be rotated so that the flat edge faces forward, mid-way between the front panels of the Remote Control Unit and Auto Locator.

  • Page 27: Connections

    Section 2 Installation 2.4 Connections Before connecting cables to the MTR-90III, it is recommend that the 2 rubber bumpers supplied be screwed into two of the 4 corners of the chassis on the rear of the machine (the corners chosen depend on the specific installation).

  • Page 28: Ac Power Cord Wiring

    CAUTION: Do not plug the other end of the power cable into the AC mains until it is verified that the actual mains voltage meets the specified requirements for the MTR-90III as labeled on its rear panel. Refer to §2.6 for details on conversion of the power supply. Also, check to make sure the MTR-90III power switch is turned off before plugging in the power cord.

  • Page 29: Nr Remote Connector

    2.4.2 NR Remote Connector When using Noise Reduction equipment, it can be automatically or remotely switched by means of a 50-pin Amp. connector on the MTR-90III (mates with AMPHENOL 57 series 50p plug or equivalent). See Table 2-5 for pin assignment of this logic connector.

  • Page 30: Serial I/O Connector

    (sig) GND N.C. RDR STA N.C. N.C. N.C. DATA BUSY N.C. For technical information about ASCII Command Characters List, contact Otari or the local Otari dealer. The necessary connector is DC-25P (TRW CINCH) or its equivalent. 2 - 12 October 1990...

  • Page 31: Parallel I/O Connector

    MTR-90III Operation and Maintenance Manual Section 2 Installation 2.4.5 Parallel I/O Connector The Otari Standard Parallel I/O Connector is used for connection with external controlling devices. Table 2-10 Parallel I/O Connector Pin Assignments Function Level In/Out RECORD Switch PLAY Switch...

  • Page 32: Power Supply Conversion

    Section 2 Installation MTR-90III Operation and Maintenance Manual 2.5 Power Supply Conversion Voltage Conversion When the machine is used at a different voltage, the connection plug for the power supply needs to be rewired. To change the wiring, remove the bottom section of the back panel to expose the voltage selector plug (white nylon connector) to the “L”...
  • Page 33 Section 3 Controls and Indicators This section describes the controls, indicators and connectors on the MTR-90III Tape Recorders, the CB-147 Remote Control Unit and on the optional CB-148 Auto Locator. 3.1 Transport Controls and Indicators ....... 3-2 3.2 Rear Panel...

  • Page 34: Section 3 Controls And Indicators

    Section 3 Controls and Indicators MTR-90III Operation and Maintenance Manual 3.1 Transport Controls and Indicators TAPE SPEED RESET UNLOAD SPOT ERASE SHIELD Figure 3-1 MTR-90III Transport Features and Controls NOTE: Numbers in brackets [ ] refer to Figure 3-1. The transport buttons glow dimly while power is on. When power is first turned on, the UNLOAD button [4] is brighter than the other buttons.
  • Page 35 MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators [5] SPOT ERASE Button This button is used to erase unwanted tracks. Refer to §4.2.9 for a detailed description on using the Spot Erase mode. [6] Cue Wheel/Indicators The Cue Wheel controls the direction and speed of tape motion in Cue mode.
  • Page 36 Section 3 Controls and Indicators MTR-90III Operation and Maintenance Manual [12] STOP Button This button is used to stop tape motion. Exiting Record Mode: Press this button to exit Record mode and stop the tape. Loading: Press this button when slack is present in the tape path (after unloading or when threading the tape) to activate the servos.

  • Page 37: Rear Panel

    MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators 3.2 Rear Panel N R R E M O T E A M P R E M O T E 1 3 - 2 4 C H A M P R E M O T E 1 - 1 2 C H...
  • Page 38 Section 3 Controls and Indicators MTR-90III Operation and Maintenance Manual [5] PARALLEL I/O Connector This is a standard Otari parallel I/O interface connector. [6] SERIAL I/O Connector These connectors provide serial remote control of transport and audio channel modes. [7] REMOTE Connector This connector is used for Remote Controllers (e.g., CB-147).

  • Page 39: Remote Control Unit (Cb-147)

    FIX Mode: The capstan speed is fixed by reference to an internal crystal oscillator at either 15 ips (38 cm/s) or 30 ips (76 cm/s) selected by the TAPE SPEED button (§3.1, [2]) on the MTR-90III. October 1990 3 - 7...
  • Page 40 Display screen [4] in percent or ips. The SPEED DISPLAY button [5] must be pushed to view this variation. The speed is varied from the speed set by the TAPE SPEED button (§3.1, [2]) on the MTR-90III. EXT Mode: The capstan speed can be varied by reference to an external oscillator, synchronizer, etc.
  • Page 41 MTR-90III Operation and Maintenance Manual Section 3 Controls and Indicators [10] READY/SAFE Switches/Indicators These 2-position switches are provided for setting individual channels in Record Ready or Record Safe mode. The red indicators above illuminate when that READY/SAFE switch is set to READY, indicating that the corresponding channel is ready for recording.

  • Page 42: Auto Locator (Cb-148)

    The Tape Time readout displays the elapsed time of the tape relative to the same zero point shown on the MTR-90III Tape Time Counter display (§3.1, [1]) or any other point on the tape such as the beginning of a take. The Tape Time readout is also provided with a minus sign at the head of digital readouts when the elapsed time diminishes from 0.00.00, that is, just before...
  • Page 43 The LOAD button changes the Tape Time readout to display the same tape time shown on the MTR-90III Tape Time Counter Display (§3.1, [1]). In other words, it resets the Auto Locator Tape Time to correspond to the actual time shown on the transport.
  • Page 44 Auto Locator PLAY and/or RECORD buttons can be pressed without affecting the selected Auto Locator mode; pressing the RECORD or PLAY buttons on the MTR-90III or Remote Control Unit will override the Auto Locator function. [12] AUTO REWIND Button...
  • Page 45 Record mode. Exiting Shuttle Mode: To end (“abort”) a Shuttle, press STOP, RWD or F.FWD on the Auto Locator or the MTR-90III transport; or the PLAY button on the Remote Control Unit or on the transport.
  • Page 46 [15] SEARCH ZERO Button Pressing the SEARCH ZERO button causes the MTR-90III to return at fast wind (or rewind) speed to the 0.00.00 Tape Time shown on the MTR-90III Tape Time readout. There are three variations of Search Zero Mode.
  • Page 47 Section 4 Operation This section contains a list and an accompanying explanation of each of the operating conditions (or modes) of the MTR-90III and detailed instructions describing each mode of operation. All portions of this section should be read when first becoming familiar with the machine and then again as a guide while learning to operate the machine.

  • Page 48: Section 4 Operation

    To shuttle the tape back and forth slowly, do not attempt to move the reels by hand. Instead, place the transport in Stop mode and turn the top of the capstan by hand or press the MTR-90III CUE button and move the adjacent Cue Wheel.

  • Page 49: Record And Play Modes

    OTARI representative or the OTARI technical service department for assistance. NOTE: If the MTR-90III is set up with a 16 channel (8-channel) head assembly, disregard all Remote Control Unit switches for channels 17-24 (9- 24).

  • Page 50: Recording Initial Tracks

    3. Reset the Tape Time Counter by pressing the RESET button on the MTR-90III. 4. Apply a test signal to those inputs to the MTR-90III corresponding to the tracks to be recorded. 5. On the Remote Control Unit press the ALL INPUT button.

  • Page 51: Playback Of Initial Tracks

    MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2.3 Playback of Initial Tracks 1. Rewind the tape to the beginning of the recording by pressing SEARCH ZERO on the Auto Locator (if the Tape Timer was reset at the beginning of the recording session) or by pressing the REWIND button.

  • Page 52: Sel·rep Recording (Punch-Ins)

    Record. At the moment that the track(s) enter Record mode, the MTR-90III switches the output of the tracks being recorded to Input monitor so that the new material can be monitored as it is being recorded in synchronization with the material recorded earlier.

  • Page 53: Rehearsal Of Overdubs And Punch-Ins

    MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2.6 Rehearsal of Overdubs and Punch-Ins For the overdub and punch-in procedures discussed in § 4.2.4 and § 4.2.5 there was no way to monitor the new input signal unless and until the machine was recording.

  • Page 54: Mixdown

    20 dB. 1. While the machine is in Fast Forward or Rewind mode, press the CUE button on either the MTR-90III or the Remote Control Unit to retract the tape lifters. 2. The lifters will remain retracted for as long as the button is held pressed.

  • Page 55: Spot Erasure

    MTR-90III Operation and Maintenance Manual Section 4 Operation 4.2.9 Spot Erasure The Spot Erase function is available for erasing short lengths of unwanted tracks. 1. Search for the portion of tape to be erased in Cue mode or by rotating the top of the capstan motor by hand.

  • Page 56: External Speed Reference

    An external clock (reference oscillator) can be used to control the speed of the MTR-90III capstan motor. When the SPEED MODE switch is set to EXT position, a suitable input signal must be applied to P/N18 of the EXT CLOCK...

  • Page 57: Auto Locator Operation

    Section 4 Operation 4.3 Auto Locator Operation The OTARI CB-148 Auto Locator is designed specifically for the MTR-90III. It uses a microcomputer for sophisticated, precision control of tape motion without overshoot. The tape time memory stores up to 10 cue points (11 if...

  • Page 58: Recalling Cue Points

    Section 4 Operation MTR-90III Operation and Maintenance Manual Storing with the STO Button and the 10-Key Pad: The STO button is used to memorize the time displayed in the Locate Time readout. Up to ten different times can be stored at once. Memory is volatile, meaning it is not saved after the power is turned off.

  • Page 59: Search

    Searching with the SEARCH Button and the 10-Key Pad: Pressing the SEARCH button causes the MTR-90III to fast wind the tape until the Auto Locator Tape Time matches that shown on the Locate Time readout. There are three variations of Search mode: 1.

  • Page 60: Search Zero

    4.3.6 Search Zero Pressing the SEARCH ZERO button causes the MTR-90III to return at fast wind speed to the 0.00.00 Tape Time shown on the MTR-90III Tape Time readout. There are three variations of Search Zero Mode. NOTE: If the Auto locator Tape Time readout has been changed to a different zero from the MTR-90III, it will reset to match the MTR-90III the moment SEARCH ZERO is pressed.

  • Page 61: Shuttle

    NOTE: Shuttle/Record mode works only when the Auto Locator RECORD button is pressed. Pressing the RECORD button on the Remote Control Unit or MTR-90III ends the shuttle and immediately causes the machine to enter normal Record mode. To end ("abort") a Shuttle, press STOP, REWIND or FAST FORWARD on the Auto Locator;...

  • Page 62: Setting The Tape Time Readout (Offset Mode)

    The Tape Time readout displays the elapsed time of the tape relative to the same zero point shown on the MTR-90III readout or any other point on the tape such as the beginning of a take. The Tape Time readout setting can be changed in various ways: to match the Tape Time Counter Display, to match the Locate Time readout, or to read zero.

  • Page 63: Section 5 Maintenance

    Section 5 Maintenance The OTARI MTR-90III requires very little maintenance other than routine electronic alignment to different tape batches, cleaning, and demagnetization. In addition to these day-to-day maintenance procedures, there are a few items that will benefit from occasional cleaning and/or lubrication. Such items, plus a few parts replacement procedures, are covered in this section of the manual.

  • Page 64: Demagnetizing And Cleaning

    MTR-90III when performing these procedures. DEMAGNETIZING CAUTION: Never turn on or turn off the power to the demagnetizer unless it is at least 1 meter (3 feet) away from the MTR-90III. The demagnetizer creates an especially strong moving magnetic field which could possibly place a permanent magnetic charge on parts of the tape machine.

  • Page 65: Cleaning The Tape Path

    Scrape flutter filter roller CAUTION: Do not use isopropyl alcohol for the tachometer and capstan rollers. Instead used Otari “Deck Solvent” or equivalent that has similar high volatility. This should be done as often as humanly possible, i.e., between sessions or approximately every 2–4 reels of tape.

  • Page 66: Cleaning The Head Shield Screw

    Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.1.3 Cleaning the Head Shield Screw Perform this procedure once every 6 months or if the shields should become noisy or move erratically. 1. Turn the power off and open the VU Meter Panel.

  • Page 67: Routine Maintenance

    To gain access to the Hour Meter, lower the VU Meter Panel and open the Transport. The total amount of time the MTR-90III is in Load, Play and Record, and Fast Wind (F.FWD and RWD) modes is indicated on the Hour Meter PCB Assembly.

  • Page 68: Reel Motor Replacement

    Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.2.3 Reel Motor Replacement 1. Turn the power off and unplug the AC power cable. 2. Remove the guard ring around the reel turntable of the motor to be replaced and then loosen the two recessed allen screws in the turntable hub and lift it off the motor shaft.

  • Page 69: Brake Pad Replacement

    MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.2.4 Brake Band Replacement Brake bands receive very little wear and seldom require replacement. If a band does wear out, perform the following procedure. 1. Turn off the power. Open the VU Meter Panel. Open the Transport.

  • Page 70: Vu Meter Lamp Replacement

    The VU meter lamps are operated at less than their rated voltage and should have a very long life. If a lamp does burn out, replacement lamps are available from OTARI (Otari Part No. LU2070). 1. Turn off the power. Open the VU Meter Panel.

  • Page 71: Circuit Descriptions

    MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.3 Circuit Descriptions Pertinent schematic diagrams in the drawing package accompanying this manual are referred to after each subtitle alternate drawing numbers are also given in parenthesis( ). Each circuit board has its own individual power supply regulation to provide the necessary voltages.

  • Page 72: Output Stage

    Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.3.5 Output Stage PB-16KOA (PB9A577) Three FETs select the signal source to the output amplifier: the repro head (Q120), sync repro (Q122), or the input to the record electronics (Q118). The logic-selected signal is fed to the first stage of a dual Op Amp (Operational Amplifier) (IC103A) and then to a bias trap, the second half of the Op Amp (IC102B) and another bias trap.

  • Page 73: Audio/Bias Mixing Circuitry

    MTR-90III Operation and Maintenance Manual Section 5 Maintenance 5.3.7 Audio/Bias Mixing Circuitry PB-16KOA (PB9A577) A master bias signal is generated on the Bias Control board and distributed to each channel's electronics, where it is amplified and mixed with the pre- conditioned audio input.

  • Page 74: Reel Control Board

    Section 5 Maintenance MTR-90III Operation and Maintenance Manual 5.3.9 Reel Control Board PB-4QHB (PB9B266) As a system, the Reel Control board, swing arm potentiometers, motor drive amp output, and reel motors, all maintain constant the tape tension. In addition, the Reel Control board senses whether the swing arms are in the correct position to allow arming of the reel servos, or in a position that would require disarming of the servos.

  • Page 75: Section 6 Alignment

    The schedule will depend on the amount and type of use to which the MTR-90III is subjected, but a minimum of once every 6 months or 1,000 hours of operation is recommended.

  • Page 76: Transport Alignment

    6.1.1.1 Opening and Closing the Transport Panel The transport deck plate of the MTR-90III can be tilted up about 25° for very easy access to the inside of the transport. Opening the Transport Panel 1.

  • Page 77: Removing The Transport Deck Plate

    Refer to Figure 6-1 for the following instructions. The screws to be removed are indicated with black arrows. 1. Turn off the MTR-90III POWER switch. 2. Remove the Head Assembly Cover by loosening the four cap head allen screws that secure the Head Assembly Top Cover.

  • Page 78: Reinstalling The Transport Deck Plate

    (penetration of the head into the tape path) or head height. This system makes it possible for OTARI to factory set the zenith, wrap and height so that no further field adjustments are required. The only adjustment...

  • Page 79: Reproduce Head Azimuth

    1. Thread a test tape on the transport; a dual-trace oscilloscope should be connected to the CH 2 and CH 23 outputs on the MTR-90III (or CH 2 and CH 15 on the 16 track head assembly, CH 2 and CH 7 on the 8 track head assembly).

  • Page 80: Swing Arm Travel

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.3 Swing Arm Travel These adjustments should be checked and performed after every 6 months of heavy machine use or whenever a swing arm component has been damaged or replaced. The two L-brackets on the linkage of each swing arm restrict swing arm travel when they contact a rubber-padded post screwed to the deck plate.

  • Page 81: Fast Forward/Rewind Damping Solenoid Adjustment

    MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.4 Fast Forward/Rewind Damping Solenoid Adjustment The Fast Forward/Rewind damping solenoid can be moved back and forth after loosening the four phillips screws beneath the deck plate. Repeat the following procedure for the Supply and Take-up sides of the transport.

  • Page 82: Swing Arm Adjustment

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.5 Swing Arm Adjustment When the power is on and the swing arm solenoids have been activated, the swing arm tension is solenoid controlled only in Fast Forward and Rewind modes. The tension of the coil springs on each swing arm should be checked periodically and adjusted as required to maintain accurate functioning.

  • Page 83: Tape Lifter Adjustment

    MTR-90III Operation and Maintenance Manual Section 6 Alignment LIFTER SOLENOID AIRPOT ADJUSTMENT SCREWS FOR "L" BRACKET ON LINKAGE (LIFTER IN RESTING POSITION) LINKAGE TO OTHER TAPE LIFTER ASSEMBLY (THIS PROCEDURE ADJUST BOTH LIFTERS AT THE SAME TIME) LIFTER PIN Figure 6-5 Tape Lifter Adjustment NOTE: Components shown are an "x-ray"...

  • Page 84: Brakes

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.7 Brakes Braking is accomplished primarily through the servo control of the reel motors. As a safety backup in case of power failure, mechanical brakes have been provided. A padded felt band is spring loaded against a brake drum attached to the reel motor shaft.

  • Page 85: Reel Turntable Height

    MTR-90III Operation and Maintenance Manual Section 6 Alignment NOTE: This adjustment is not critical to the performance to the machine. A 150-200 gram difference in tension between the Supply and Take-up sides is acceptable for balanced braking in case of a power failure.

  • Page 86: Reel Tension Servo Adjustments

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.9 Reel Tension Servo Adjustments Before these adjustments can be performed, the swing arm adjustments and/or voltage measurements should be checked. Refer to § 6.1.5. 6.1.9.1 Upper and Lower Limit Adjustment of Reel Tension Steps 2 and 3 are necessary only if either or both tension arm assemblies have been disassembled.

  • Page 87: Preliminary Center Position And Gain Adjustments

    MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.9.2 Preliminary Center Position and Gain Adjustments Before performing these adjustments, the Swing Arm Travel adjustments should be performed as described in § 6.1.3. This method of adjustment requires a digital voltmeter but needs no tape on the machine. Remove any tape and/or reels.

  • Page 88: Reel Motor Tracking With Capstan

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.9.4 Reel Motor Tracking with Capstan The potentiometers for adjusting the motor tracking torques are located on the TRANSPORT CONTROL PCB Assembly. 1. Turn off the power to the machine, and extend the TRANSPORT CONTROL PCB Assembly with the EXTENSION PCB Assembly.

  • Page 89: Fine Adjustment Of Position And Gain

    PCB Assembly) to eliminate the jitter. If this problem persists, it is possible that the Capstan Roller may need replacement. Contact OTARI or your local OTARI dealer for this part and technical assistance in proper installation. 6.1.9.6 Reel Size Detector Adjustment 1.

  • Page 90: Capstan Servo Adjustments

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 6.1.10 Capstan Servo Adjustments NOTE: Refer to the following illustrations: Figure 6-11 for Capstan Tachometer Adjustment Figure 6-12 for CAPSTAN CONTROL PCB Assemblies Adjustments 6.1.10.1 Capstan Tachometer Adjustment 1. Turn off power to the machine. Extend the CAPSTAN CONTROL PCB Assembly (board #2).

  • Page 91: Adjustment Of Capstan Control Pcb Assembly

    MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.1.10.2 Adjustment of CAPSTAN CONTROL PCB Assembly 1. Turn off power to the machine and extend the CAPSTAN CONTROL PCB Assembly. 2. Engage the reel servo system by threading the machine with tape.

  • Page 92: Capstan Control Pcb Assembly

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 8. Put the machine into Fast Forward or Rewind and adjust VR1 FAST SPEED on the I/O CONTROL PCB Assembly (front panel) to obtain a frequency reading of 64 kHz. NOTE: If VR1 is left fully clockwise, a time delay will occur when going from fast wind modes to other modes of operation.

  • Page 93: Adjustment Of Transport Control Pcb Assembly

    Assembly for an output of +4 dBu (or whatever standard operating level has been chosen). 6. The MTR-90III VU meter should indicate 0 VU. If it does not, open the VU meter panel by removing the 3 screws along the upper edge of the panel and pivot the meter panel down to the horizontal position.

  • Page 94: Audio Alignment

    REPRO be within 1 dB of 0 VU. GAIN NOTE: As a convenience, the MTR-90III is provided with a fixed low frequency equalization characteristic that suit most applications. If, however, HI SPD different characteristic are required (i.e., a tape from another studio), the MTR-90III can be realigned with a custom-tailored low frequency EQ.

  • Page 95: Sync Amp Alignment

    MTR-90III Operation and Maintenance Manual Section 6 Alignment 6.2.2 Sync Amp Alignment 1. Engage the ALL SEL·REP button on the Remote Control Unit. ALL SAFE should still be engaged. REPRO 2. Rewind the test tape and locate and play the 1 kHz reference tone.

  • Page 96: Record Alignment

    Section 6 Alignment MTR-90III Operation and Maintenance Manual 10. Turn the BIAS control on the AUDIO PCB Assembly counterclockwise until the indication on the VU meter begins to drop. If the control is PHASE already fully counter-clockwise, turn the BIAS control clockwise until the LOW SPD indication on the VU meter peaks.

  • Page 97: Record Phase Compensation

    Record Section of Audio PCB Assemblies obtain a 0 VU meter indication. This matches the input sensitivity and monitor level of the MTR-90III to the output level of the mixing console. 6.2.5 Record Phase Compensation Adjustable record phase compensation networks are provided for the record amplifier circuitry.

  • Page 98: Erase Current Adjustment

    Figure 6-17 is a block diagram of the audio signal path for one channel for the 24-track MTR-90III (8 and 16 track versions may differ slightly). On it are indicated the nominal signal levels in dBu (ref. 0 dB=0.775 V RMS) given a 1 kHz signal with NAB EQ at 30 ips.

  • Page 99: Mtr-90Iii Block Diagram

    MTR-90III Operation and Maintenance Manual Section 6 Alignment Figure 6-18 MTR-90III Block Diagram October 1990 6 - 25...
  • Page 101 Section 7 Specifications 7.1 Tape Transport ........... . . 7-2 7.2 Electronics (Measured with AMPEX #456 Tape) .

  • Page 102: Section 7 Specifications

    Section 7 Specifications MTR-90III Operation and Maintenance Manual 7.1 Tape Transport Tape Width And Tracks 1-inch (25.4 mm) 8 tracks* *manufactured to order 2-inch (50.8 mm) 16 tracks 2-inch (50.8 mm) 24 tracks Heads Plug-in head blocks with full access to independent head azimuth adjustment.

  • Page 103: Electronics (Measured With Ampex #456 Tape)

    MTR-90III Operation and Maintenance Manual Section 7 Specifications 7.2 Electronics (Measured with AMPEX #456 Tape) Line Input Transformerless Active Balanced (Floating transformers are optional) Input Impedance: 10 kΩ (20 Hz to 20 kHz) Nominal Level: +4 dBu Connectors: XL-3 type, Female...

  • Page 104: Physical

    Section 7 Specifications MTR-90III Operation and Maintenance Manual 7.3 Physical Weight approx. 200 kg (440 pounds) Dimensions 1,085 mm (H) X 770 mm (W) X 620 mm (D) [43" (H) X 30" (W) X 24-1/2" (D)] Finish Light beige and gray pebble finished steel chassis, black cover panels.

  • Page 105: Accessories

    Audio & Control Extender PCB Assembly PB-73H Extender PCB Assembly for 1” 8-channel models ZA-54D Spare PCB Assembly Kit In the interest of product improvement, Otari reserves the right to change these specifications without notice or obligation. April 1992 7 - 5...

  • Page 107: Section 8 Printed Circuit Board Layouts And Parts Lists

    Parts list includes only main parts or the parts difficult to obtain in the field. Also the lists include the parts which should be replaced with the exact same parts supplied by OTARI to maintain performance. Many diodes, transistors, and ICs are well described in the schematics attached to the machine, so to find out the correct parts number of the needed parts, refer to the schematics.

  • Page 108: Pb-16Ka Rec & Repro Amplifier P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.1 PB-16KA REC & REPRO Amplifier P.C.B. Assembly Description Part No. Notes P.C.B. PB9A577 RV101 Potentiometer RV414172 PB GAIN 10 kΩ RV102 Potentiometer RV423171 PB H EQ 2 kΩ...
  • Page 109 MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists October 1990 8 - 3...
  • Page 110 Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8 - 4 October 1990...

  • Page 111: Pb-15L Bias Control P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.2 PB-15L Bias Control P.C.B. Assembly Description Part No. Notes P.C.B. PB9A465A VR1~VR3 Potentiometer RV414172 BIAS ADJ. 10 kΩ Potentiometer RV414207 ERASE ADJ. 10 kΩ Potentiometer RV414207 TEST SIGNAL 10 kΩ...

  • Page 112: Pb-4Pka Reel Size Detect P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.3 PB-4PKA Reel Size Detect P.C.B. Assembly Description Part No. Notes Reel Size Detect PCB PB9B599- Bare Board Connector, Head CN403043 Connector, Head CN406046 Connector, Head...

  • Page 113: Pb-45Mb Speed Calculate P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.4 PB-45MB Speed Calculate P.C.B. Assembly Description Part No. Notes P.C.B. PB9A456B Bare Board Connector CN404053 Male Connector CN403062 Female 4P Female Contact CN7B-053 Connector CN406055...

  • Page 114: Pb-45R Hour Meter P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.5 PB-45R Hour Meter P.C.B. Assembly Description Part No. Notes P.C.B. PB9A489 Connector CN403056 Male Connector CN403065 Female Housing 7P Socket Contact CN7B-052 Spring GS3010 P.C.B. Holder...

  • Page 115: Pb-46A Capstan Photo Amplifier P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.6 PB-46A Capstan Photo Amplifier P.C.B. Assembly Description Part No. Notes P.C.B. PB9A492A Connector CN406055 EI Type Male Connector CN406064 EI Type Female Connector CN408057 EI Type Male...

  • Page 116: Pb-45Sb Reel Power Tr P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.7 PB-45SB Reel Power TR P.C.B. Assembly Description Part No. Notes P.C.B. PB9A448 Connector CN403052 Male Connector CN403061 Female 3P Socket Contact CN7B-053 Connector CN404044 Male...
  • Page 117 MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists October 1990 8 - 11...
  • Page 118 Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8 - 12 October 1990...

  • Page 119: Pb-45T Capstan Power Tr P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.8 PB-45T Capstan Power TR P.C.B. Assembly Description Part No. Notes P.C.B. PB9A449 Connector CN403052 Male Connector CN403061 Female 3P Socket Contact CN7B-053 Connector CN403082 Socket 3P...

  • Page 120: Pb-45Va Capstan Control P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.9 PB-45V Capstan Control P.C.B. Assembly Description Part No. Notes P.C.B. PB9A459A Potentiometer RV415175 100 kΩ PLAY GAIN Potentiometer RV424173 20 kΩ PLAY DAMP Potentiometer RV416178 1 MΩ...
  • Page 121 MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists October 1990 8 - 15...
  • Page 122 Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8 - 16 October 1990...

  • Page 123: Pb-47Ab Transport Control P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.10 PB-47AB Transport Control P.C.B. Assembly Description Part No. Notes P.C.B. PB9A578B SW1, SW2 Switch WH91023 Shield Operation Switch WH94008 STAND-BY INHIBIT D9~D22 Diode PNTLR124 RV1, RV2...

  • Page 124: Pb-4Apa Master Cpu P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.11 PB-4APA Master CPU P.C.B. Assembly Description Part No. Notes P.C.B. PB9A836A Diode PN-0161 Diode PNTLR124 X Tal PZ4C011 Potentiometer RV424249 20 KΩ Pitch Control Reference...
  • Page 125 MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists October 1990 8 - 19...
  • Page 126 Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8 - 20 October 1990...

  • Page 127: Pb-45Ya I/O Control P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.12 PB-45YA I/O Control P.C.B. Assembly Description Part No. Notes P.C.B. PB9A463C D11, D13, D14 Diode PNTLR124 VR1, VR3 Potentiometer RV414207 10 kΩ VR6, VR7 Potentiometer RV454210 50 kΩ...

  • Page 128: Pb-45Z Tape Counter P.c.b. Assembly

    Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8.13 PB-45Z Tape Counter P.C.B. Assembly Description Part No. Notes P.C.B. PB9A462 Capacitor C71R012M 1 µF/35 V Tantalum IC13 I-0012 LAMP TEST Switch WH31016 Check Pin...
  • Page 129 MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists October 1990 8 - 23...
  • Page 130 Section 8 Printed Circuit Board Layouts and Parts Lists MTR-90III Operation and Maintenance Manual 8 - 24 October 1990...

  • Page 131: Pb-4Hqb Reel Control P.c.b. Assembly

    MTR-90III Operation and Maintenance Manual Section 8 Printed Circuit Board Layouts and Parts Lists 8.14 PB-4HQB Reel Control P.C.B. Assembly Description Part No. Notes Reel Control PCB PB9B266- Bare Board D1,D2,D4~D8 D10~D12,D14~D20 Diode, 1S1585LB5 PN-0199- D3, D13 Diode, ERA15-02 PN-0285-...

  • Page 133: Section 9 Exploded Views And Parts Lists

    When ordering parts, give a full description, using both the part number and the name of the part. If there seems to be a discrepancy between the drawings herein and your MTR-90III, contact OTARI; we assume no liability for improper servicing due to changes and improvements which we may make that subsequently render certain of these documents obsolete.
  • Page 134 Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.1 Head Assembly: KH-6K These key numbers which preceed the parts description refer to callouts in the exploded views. Each parts list is associated with one exploded view drawing, as indicated by the number in brackets after the parts list title.
  • Page 135 MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.2 Capstan/CNT Roller Assembly: KC-6E/KI-6E Description Part No. Notes Capstan Assembly KC-6E-A Capstan Photo PCB Assembly PB-46A Bracket, PCB PB46A01 Stud KZ7B811 Stud KZ7B810 Cap, Capstan KC0B020 Roller Sub Assembly...
  • Page 136 Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.3 Tape Lifter/Shield Assembly: KR-6B/ZA-72S Description Part No. Notes Bracket, Solenoid KR6B009 Solenoid GP1B06 Pin, Solenoid KZ5A003 Bar, Connector KR6B006 Stopper, A KR6B007 Stopper, B KR6B010 Stopper, Rubber...

  • Page 137: Tension Arm Assembly: Ka-6H

    MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.4 Tension Arm Assembly: KA-6H Description Part No. Notes Protector, Tension Roller T004407 for 2" Damper T004408 Roller Assembly, Tension GR-6H Tension Arm KA6A039 Bar C, Connection KA6B001...

  • Page 138: Reel Assembly: Kw-6B

    Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.5 Reel Assembly: KW-6B Description Part No. Notes Reel Table Assembly KW0HG for 2" Pin, Reel Drive KW0E042 Guard Ring, Reel Turntable KW0H043 Motor Assembly, Reel MR5A030S Plate, Brake Base...

  • Page 139: Motor Drive Heatsink Assembly: Za-94Y

    MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.6 Motor Drive Heatsink Assembly: ZA-94Y Description Part No. Notes Panel, Rear ZA94Y01 Heatsink ZA93J02 Panel, Side ZA92F02 Edging PZ1G076 Handle CY1020 Fan, Cooling AS1021 Guard, Fan AS5010...

  • Page 140: Amp Chassis Assembly (A1050)

    Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.7 Amp Chassis Assembly: Description Part No. Notes Cover, Amp Chassis CB30902 Panel, Amp L Side K104602 Panel, Amp R Side K104601 Angle, Amp Rack K104607 Angle A, Amp Guide Rail...

  • Page 141: Control Panel (Cb-24J)

    MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.8 Control Panel Assembly/24CH VU meter Assembly: CB-24J/ZA-94Z No. Description Part No. Notes No. Description Part No. Notes Knob KN1112 for 2" 39 Connector CN250403 Block, Splicing T902207...

  • Page 142: Control Chassis Assembly (Cb-319)

    Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.9 Control Chassis Assembly: CB-319 No. Description Part No. Notes REEL CONTROL PCB Assembly PB-4HQB CAPSTAN CONTROL PCB Assembly PB-45VA TRANSPORT CONT. PCB Assembly PB-47AB MASTER CPU PCB Assemblyy...

  • Page 143: 24Ch Input/Output Assembly: Za-95A

    MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.10 24CH Input/Output Assembly: ZA-95A Description Part No. Notes Panel, Amp Chassis Rear Panel ZA95A01 Panel, Output Transformer ZA92H02 Wire Assembly, Amp Control ZA-63A Connector, XLR CN103046 Connector, XLR...

  • Page 144: Power Supply Assembly: Ds-4W

    Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.11 Power Supply Assembly: DS-4W 9.11.1 Power Supply Assembly [1] Description Part No. Notes Cover, Power Supplies DS1Z025 Frame, Heatsink DS1Z022 Heatsink B ZA91P01 Rectifier PN-0005 Heatsink A...

  • Page 145: Power Supply Assembly [2]

    MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.11.2 Power Supply Assembly [2] No. Description Part No. Notes No. Description Part No. Notes Panel, Power Supplies DS1Z008 54 Circuit Breaker WH91038 Chassis, Power Supplies DS1Z001 55 Circuit Breaker...

  • Page 146: Case Assembly: K1176

    Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.12 Case Assembly: K1176 Description Part No. Notes Frame, Case K106014 Panel L, Case Side K117610 Panel R, Case Side K117611 Panel, Power Supplies Rear K117612 Handle CY1021...

  • Page 147: Remote Control Assembly: Cb-147-S

    MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists 9.13 Remote Control Assembly: CB-147-S Description Part No. Notes Panel, Front CB24K01 Escutcheon, Front CB14701 Cover, Acryl CB24403 Bracket, Angle CB24501 P.C.B. Assembly, indicator PB-77N Angle, P.C.B. Mount KZ3A104 P.C.B.

  • Page 148: Auto Locator Assembly:cb-148-S

    Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual 9.14 Auto Locator Assembly:CB-148-S Description Part No. Notes Panel, Front CB14801 Escutcheon, Front CB14701 Protector, B, Switch CB10414 Cap, Rec KN2043 Cap, Play KN2041 Cap, Stop KN2040 Cap, FF, Rew...
  • Page 149 MTR-90III Operation and Maintenance Manual Section 9 Exploded Views and Parts Lists October 1990 9 - 31...
  • Page 150 Section 9 Exploded Views and Parts Lists MTR-90III Operation and Maintenance Manual Hardware Name Code Name Code Bind SEMS Screw Hex Head Bolt Pan SEMS Screw Hex Nut Triple Screw Flat Washer Fiber Washer Binding Head Screw Pan Head Screw...
  • Page 151 An external clock (reference oscillator) can be used to control the speed of the MTR-90III capstan motor. When the SPEED MODE switch is set to the EXT position (see § 3.2), a suitable input signal must be applied to P/N18 of the EXT CLOCK input connector (25 pin Honda connector on the MTR-90III rear panel) or P/N20 of the PARALLEL I/O connector.
  • Page 152 SUGGESTIONS REGARDING INTERFACE OF THE MTR-90II TO A SMPTE BASED SYNCHRONIZER OR CONSOLE AUTOMATION SYSTEM. The following Steps should be performed whenever the MTR-90III is to be interfaced with a SMPTE based system: 1. Turn on SW1-4 on the MTR-90 TRANSPORT CONTROL PCB Assembly.
  • Page 153 A. The WBR-1S is a piggyback PCB attached to an audio channel PCB. This modification must be done by Otari, and is available installed on either a new or your existing audio PCB. The WBR-1S can also serve as a normal Audio channel PCB (switchable) if so ordered.
  • Page 154 MTR-90III Operation and Maintenance Manual Adams-Smith 2600 SMPTE Synchronizers Figure A-1 illustrates the necessary cables for interfacing the Adams-Smith Model 2600Y Tape Synchronizer with the MTR-90III EXT CLOCK or Parallel I/O connector. The following notes apply to Figure A-1. 1. Typical Form C relay contact.
  • Page 155 MTR-90III Operation and Maintenance Manual Appendix A ADAMS-SMITH 2600SY MTR-90III EXT CLOCK MTR-90III TAPE SYNCHRONIZER HONDA MR-25LW PARALLEL I/O AMPHENOL 57-30500 P/N CN225215 STOP STOP F.FWD F.FWD PLAY PLAY PAUSE CTL/TACH TACH DIRECTION DIRECTION GROUND GROUND LOCK REF.OUT CAPSTAN REF.IN...
  • Page 156 BTX Shadow Synchronizer Figure A-2 illustrates the necessary cable for connecting the BTX Shadow Synchronizer with to the MTR-90III. The Capstan Speed Control Range of the Shadow must be adjusted for a range of 50% to 200% of normal play speed.
  • Page 157 MTR-90III Operation and Maintenance Manual Appendix A Audio Kinetic Q-Lock Mod. 2.10 Synchronizer Figure A-3 describes the necessary cable to interface the MTR-90III to the Audio Kinetic Q-Lock Synchronizer. Q-LOCK TRANSPORT CONTROL CONNECTOR MTR-90III MTR-90III EXT. CLOCK PARALLEL I/O CONNECTOR LINK IN "D"...
  • Page 158 The settings of the two sets of switches must be changed to accommodate the MZS 100 Synchronizer to the operation of the MTR-90III at 15 ips or 30 ips. 15 ips (10" or 14" reels)
  • Page 159 MTR-90III Operation and Maintenance Manual Appendix A MQS-100 MTR-90III MTR-90III D-37 CONNECTOR EXT. CLOCK CONNECTOR PARALLEL I/O PLAY TALLY STOP TALLY F.FWD TALLY REW TALLY LIFT COMMAND PLAY COMMAND STOP COMMAND F.FWD COMMAND REW COMMAND CAPSTAN REF GROUND EXT. CAPSTAND REF...
  • Page 161 Index 10-Key pad 3-11 storing cue points 3-12, 4-11 ZERO SET button 3-14 accessories AUTO LOCATOR connector 3-6 optional 7-5 auto rewind mode 3-12, 4-15 standard 7-5 demagnetizing the tape path 5-2–5-3 all input mode 3-9 all repro mode 3-9 all sel·rep mode 3-9 baud rate 2-12 AMP REMOTE connectors 3-5...
  • Page 162 Index MTR-90III Operation and Maintenance Manual upper and lower limit adjustment spot erase mode 4-2, 4-9 6-12 stand-by monitor mode 2-2 master audio attenuation switch 2-2, reel turntable height adjustment 6-11 fast stand-by mode 2-2, 2-3, 3-9 REMOTE connector 3-6...

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