Otari MX-5050
MARK IV›Documents

Generation

First[Mini Pro]Mark IIBB-IIMARK III[BQ-II]B-IIIMARK IV

MARK IV

OverviewIdentifySpecsHistoryDocumentsService

Machines

MKIV-2MKIV-2EMKIV-4MKIV-8

MX-5050 MKIV-2 and BIII-2 Operation and Maintenance Manual — Digital Edition · Part 0 · PDF pages 1-4,6-8,10,12

Front Matter

Part No. OS3-298
Lot: E

The OTARI wordmark in block letters, each on its own slanted black tile.⤢ zoomThe OTARI wordmark in block letters, each on its own slanted black tile.

MX-5050 MKIV-2, BIII-2
MASTER TAPE RECORDER

OPERATION AND MAINTENANCE MANUAL

FOURTH EDITION

The Otari, Inc. signature in a plain sans-serif typeface.⤢ zoomThe Otari, Inc. signature in a plain sans-serif typeface.

Printed: Dec 1997
Ed 4 (MA)

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.

SAFETY INSTRUCTIONS↑ TOP

  1. Read Instructions -- All the safety and operating instructions should be read before the device is operated.

  2. Retain Instructions -- The safety and operating instructions should be retained for future.

  3. Heed Warnings -- All warnings on the device and in the operating instructions should be adhered to.

  4. Follow Instructions -- All operating and use instructions should be followed.

  5. Water and Moisture -- The device should not be used near water — for example, near bathtub, wash bowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc.

  6. Carts and Stands -- The device should be used only with a cart or stand that is recommended by the manufacturer.

  7. Ventilation -- The device should be situated so that its location or position does not interfere with its proper ventilation. For example, the device should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installa-tion, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.

  8. Heat -- The device should be situated away from heat sources such as radiator, heat registers, stoves or other appliances (including amplifiers) that produce heat.

  9. Power Sources -- The device should be connected to a power supply only of the type described in the operating instructions or as marked on the device.

  10. Grounding or Polarization -- Precautions should be taken so that the grounding or polariza-tion means of the device is not defeated.

  11. Power Cord Protection -- Power supply cords should be routed as they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience recep-tacles, and the point where they exit from the device.

  12. Cleaning -- The device should be cleaned only as recommended by the manufacturer.

  13. Non-Use Periods -- The power cord of the device should be unplugged from the out-let when left unused for a long period of time.

  14. Object and Liquid Entry -- Care should be taken so that objects do not fall and that liquids are not spilled into the enclosure through openings.

  15. Damage Requiring Service -- The device should be serviced by qualified service personnel when:

    A. The power-supply cord or the plug has been damaged; or

    B. Objects have fallen, or liquid has been spilled into the appliance; or

    C. The appliance has been exposed to rain; or

    D. The appliance does not appear to operate normally or exhibits marked change in performance; or

    E. The appliance has been dropped, or the enclosure damaged.

  16. Servicing -- The user should not attempt to service the device beyond that described in the operating instructions. All other service should be referred to qualified personnel.

COMMUNICATION WITH OTARI↑ TOP

FOR SERVICE INFORMATION AND PARTS

All Otari products are manufactured under strict quality control. Each unit is carefully inspected and tested prior to shipment.

If, however, some adjustment or technical support becomes necessary, replacement parts are required, or technical questions arise, please contact your Otari dealer or contact Otari at:

Otari, Inc.Otari CorporationOtari Europe GmbH.Otari Singapore Pte., Ltd
4-33-3 Kokuryocho, Chofu-shi,
182-0022, Tokyo, Japan		8236 Remmet Ave.
Canoga Park, CA 91304
U.S.A.		Rudolf-Diesel-Straße 12
D-40670 Meerbusch 2 (Osterath)
Germany		40 MacTaggart Road
Singapore 368085
Phone: (81) 42481-8626
Fax: (81) 42481-8633		Phone: (818) 594-5908
Fax: (818) 594-7208		Phone: (49) 2159-50861
Fax: (49) 2159-1778		Phone: (65) 284-7211
Fax: (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 equipment, and for the technical support program to function properly, please include the following information, most of which can be obtained from the Serial number label on the machine, in all correspondence with Otari:

  • Model Number:
  • Serial Number:
  • Date of Purchase:
  • Name and address of the dealer where the machine was purchased and the power requirements (voltage and frequency) of the machine.

Table of Contents↑ TOP

Safety Instructionsv
Communication with Otarivii
Section 1 Introduction
1.1MX-5050 Series1-2
1.2Using This Manual1-3
1.2.1Organization1-3
1.2.2Conventions within this manual1-4
Section 2 Installaion
2.1Unpacking and Inspection2-2
2.2Audio Signal Connection2-3
2.2.1Audio Connectors2-3
2.2.2Balance/Unbalance Adjustment2-4
2.3Switch Position Adjustment2-5
2.4PCB Assembly Location2-9
2.4.1MX-5050 BIII2-9
2.4.2MX-5050 MKIV22-11
2.5Power Connection2-13
2.6Fuse Replacement2-14
2.7Speed Conversion (BIII-2)2-15
2.8Equalizer Change2-15
Section 3 Controls and Indicators
3.1Tape Transport3-2
3.2Transport Control Panel3-3
3.3Head Assembly3-6
3.4Amplifier Panel3-7
3.5Audio Connector Panel3-9
3.6Connector Pin Assignments3-12
Section 4 Operation
4.1Operation Mode Reference Tables4-2
4.2Modes of Operation4-3
4.2.1Transport Modes4-3
4.2.2Audio Channel Modes4-4
4.3Operating the MX-50504-5
4.3.1Placing Reels on the Machine4-5
4.3.2Threading the Tape4-6
4.4Operation of the Transport4-7
4.4.1Playing Back the Tracks4-7
4.4.2Recording the Tracks4-7
4.4.3SEL-REP Recording4-8
4.4.4Fast Wind and CUE Monitor4-8
4.4.5Tape Editing4-9
4.4.6Using the Pitch Control Feature4-10
4.5Locator Operation4-11
4.5.1Storing Tape Locations4-11
4.5.2Search Mode4-11
4.5.3Search Play Mode4-12
4.5.4Search Zero Mode4-12
4.5.5Search Start Mode4-12
4.5.6Repeat Mode4-13
4.6Test Oscillator4-13
Section 5 Maintenance
5.1Maintenance Scheduling5-2
5.2Demagnetizing5-2
5.3Cleaning the Tape Path5-3
5.4Lubrication5-4
Section 6 Transport Adjustment and Parts Replacement
6.1Transport Access6-2
6.2Brake Torque Adjustment6-2
6.3Tape Lifter Adjustment6-4
6.4Capstan Motor Adjustment and Pitch Control Adjustment6-5
6.5Pinch Roller Pressure Adjustment6-6
6.6Tape Speed Adjustment6-8
6.7Reel Table Height Adjustment6-9
6.8Head Assembly Replacement6-10
6.9Head Position Adjustment6-11
Section 7 Audio Alignment
7.1Tools and Equipment Required7-2
7.2Block Diagrams7-3
7.2.1Peak Indicator Level Adjustment7-3
7.2.2Test Oscillator Waveform and Level Adjustment7-4
7.3Reproduce Adjustments7-5
7.3.1Reproduce Head Azimuth Adjustment7-5
7.3.2Reproduce Level Adjustment7-6
7.3.3Reproduce Equalization Adjustment7-7
7.4Record Electronics Adjustments7-8
7.4.1Record Bias Level Adjustment7-8
7.4.2Record Head Azimuth Adjustment7-9
7.4.3Record Level Adjustment7-10
7.4.4Record Equalization Adjustment7-11
7.4.5Low Frequency Reproduce Equalization Adjustment7-11
7.4.6SEL-REP Level Adjustment7-12
Section 8 Specifications
8.1Tape Transport8-2
8.2Electoronics8-3
Section 9 Exploded Views and
BIII9-2 ~ 9-19
MKIV-29-20 ~ 9-39
Appendix
Block Diagram
Troubleshooting Hints (Electronics)
Troubleshooting Hints (Transport)
Index
Schematic Diagrams

List of Figures↑ TOP

1-1Exterior Appearance1-2
2-1Audio Connectors2-3
2-2Balanced/Unbalanced Connectors2-4
2-3Switch Setting on Rear Panel2-5
2-4Controls on the CONTROL PCB Assembly2-6
2-5PCB Assembly Location (BIII)2-9
2-6AMP Section Rotation (BIII)2-9
2-7CONTROL PCB Assembly Rotation (BIII)2-10
2-8PCB Assembly Location (MKIV-2)2-11
2-9CONTROL PCB Assembly Rotation (MKIV-2)2-12
2-10Power Connection2-13
2-11AC Line Voltage Connector2-13
2-12Fuse Location2-14
3-1Tape Transport3-2
3-2Transport Control Panel3-3
3-3Head Assembly3-6
3-4Amplifier Panel (MKIV-2)3-7
3-5Audio Connector Panel (BIII)3-7
3-6Audio Connector Panel (MKIV-2)3-10
4-1Tape Threading4-6
4-2Editing a Tape4-10
5-1Demagnetizing the Head5-2
5-2Cleaning the Head5-3
5-3Lubrication5-4
6-1Brake Torque Measurement6-2
6-2Brake Torque Adjustment6-3
6-3Tape Lifter Adjustment6-4
6-4Waveform on Oscilloscope6-5
6-5Pinch Roller Pressure Measurement6-6
6-6Pinch Roller Solenoid6-6
6-7Pinch Roller Pressure Measurement6-7
6-8Reel Table Height Adjustment6-9
6-9Head Assembly Replacement6-10
6-10Height/Zenith Adjustment6-11
6-11Wrap Adjustment6-12
7-1REC/REP AMP PCB Assembly7-4
7-2Head Adjustment Screws7-5
7-3Wave Shape on the Oscilloscope7-6
7-4Head Assembly7-9
7-5Waveshape on the Oscilloscope7-9

List of Tables↑ TOP

2-1Standard Accessories2-2
2-2Settings on Rear Panel2-5
2-3DIP SW Setting on the Control PCB2-6
2-4Capstan PLL Reference2-7
2-5SEARCH 3 Key Function2-7
2-6Machine Type2-8
2-7Fuse Specifications2-15
3-1Parallel I/O Pin Assignments3-12
3-2Connector Pin 21, 223-12
3-3Remote Control Connector (MKIV-8 Option)3-13
4-1Transport Modes4-2
4-2Audio Channel Modes4-2
4-3Auto Locator Modes4-2
4-4Vari Pitch Preset4-10
4-5Cue Point Set Mode4-11
5-1Maintenance Time Table5-2
5-2Tools Required for Maintenance5-2
6-1Necessary Tools6-2
6-2Brake Tension Values6-3
6-3Tape Speed Settings6-8
7-1Reference Tapes7-2
7-2Trigger Level7-3
7-3Overbias Values7-8
Introduction →