BQ-II Instruction and Maintenance Manual — Digital Edition · Part 0 · scan pages 1-10
View source PDF ↗Front Matter
Parts No.OS3-031
⤢ zoomThe OTARI wordmark in block letters with a registered-trademark symbol.
MX-5050 BQII
PROFESSIONAL RECORDER
INSTRUCTION AND MAINTENANCE MANUAL
⤢ zoomAn MX-5050 BQ II tape recorder in its upright console cabinet, with two OTARI-branded 10½-inch reels above a control panel carrying four VU meters.
Edition No.2
Issued:November 1983
CAUTION
To prevent fire or shock hazard:
Do not expose this appliance to rain or moisture.
Do not remove back.
No user-serviceable parts inside.
Refer servicing to qualified service personnel.
SAFETY INSTRUCTIONS↑ TOP
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Read Instructions -- All the safety and operating instructions should be read before the appliance is operated.
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Retain Instructions -- The safety and operating instructions should be retained for future reference.
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Heed Warnings -- All warnings on the appliance and in the operating instructions should be adhered to.
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Follow Instructions -- All operating and use instructions should be followed.
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Water and Moisture -- The appliance should not be used near water - for example, near a bathtub, washbowl, kitchen sink, laundrytub, in a wet basement, or near a swimming pool, etc.
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Carts and Stands -- The appliance should be used only with a cart or stand that is recommended by the manufacturer.
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Ventilation -- The appliance should be situated so that its location or position does not interfere with its proper ventilation.
For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.
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Heat -- The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat.
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Power Sources -- The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance.
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Grounding or Polarization -- The precautions that should be taken so that the grounding or polarization means of an appliance is not defeated.
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Power-Cord Protection -- Power-supply cords should be routed so that they are not likely to be walked on pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.
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Cleaning -- The appliance should be cleaned only as recommended by the manufacturer.
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Nonuse periods -- The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time.
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Object and Liquid Entry -- Care should be taken so that objects do not fall and liquids are spilled into the enclosure through openings.
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Damage Requiring Service -- The appliance 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
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Servicing -- The user should not attempt to service the appliance beyond that described in the operating instructions.
All other servicing should be referred to qualified service personnel.
MX-5050 BQII
PROFESSIONAL TAPE RECORDER
INTRODUCTION↑ TOP
This manual provides descriptive information, installation, operation, maintenance and normal adjustment instructions for the Otari MX-5050 BQII Professional Tape Recorder.
⤢ zoomThe MX-5050 BQ II in its upright console, seen at an angle, with OTARI reels mounted above the four-meter control panel.
MX-5050 BQII Recorder
COMMUNICATION WITH OTARI↑ TOP
FOR SERVICE INFORMATION AND PARTS
The OTARI PRODUCTS are manufactured under strict quality control and each unit is carefully tested and inspected prior to shipment from our factory.
If, however, some adjustments or technical support become necessary, replacement parts are required, or technical questions arise, please contact your nearest Otari dealer or write to:
| OTARI ELECTRIC CO., LTD. 4-29-18, Minami Ogikubo, Suginamiku, Tokyo, 167, Japan Phone: (03) 333-9631 Telex: J26604 OTRDENKI | OTARI CORPORATION 2 Davis Drive, Belmont California 94002, U.S.A. Phone: (415) 592-8311 Telex: 25 9103764890 |
| OTARI ELECTRIC DEUTSCHLAND GmbH. Gielenstrasse 9, 4040 Neuss 1 F.R. Germany Phone: 02101-274011 Telex: 41 8517691 OTEL D | OTARI SINGAPORE PTE., LTD. Unit 5350, 2nd floor, Woh Hup Complex, 5001, Beach Road, Singapore, 0719 Phone: 294-5370 Telex: 87 36935 RS36935 OTARI |
| OTARI ELECTRIC (UK) LTD. Herschel Industrial Centre, Church Street, Slough SL1 1EL Berkshire, United Kingdom Phone: (0753) 38261-2 Telex: 849453 OTARI G |
Another part of Otari's continuous 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 our information and service applicable to your requirements, and for the technical support to function properly, please include the following information, most of which can be obtained from the name plate on the equipment in all correspondences.
- Model Number
- Serial Number
- Date of purchase
- Name and address of dealer from whom machine was purchased
- Power requirements (voltage and frequency) of the machine
- Manual number to which you are referring
Table of Contents↑ TOP
List of Illustrations and Tables↑ TOP
| Figure | Title | Page |
|---|---|---|
| 1-1 | MX-5050 BQII Major Components | 1-3 |
| 2-1 | Dimensions | 2-3 |
| 2-2 | Operating Position | 2-4 |
| 2-3 | MIC ATT | 2-5 |
| 2-4 | Adjusting Panel | 2-5 |
| 2-5 | Input/Output Assembly Connector Wiring | 2-9 |
| 3-1 | Reel Hold Down Knob | 3-13 |
| 3-2 | Tape Threading | 3-14 |
| 3-3 | Tape Splicing Block | 3-20 |
| 5-1 | Lifting the Head Cover | 5-2 |
| 5-2 | Demagnetizing | 5-4 |
| 5-3 | Lubrication | 5-5 |
| 5-4 | Voltage Selection Terminal | 5-7 |
| 5-5 | Main Power Fuse Location | 5-8 |
| 5-6 | Internal Fuse Location | 5-9 |
| 5-7 | Rotating Control P.C.B. | 5-10 |
| 6-1 | Tape Transport Access | 6-1 |
| 6-2 | Brake Measurement | 6-4 |
| 6-3 | Brake Assembly Location | 6-4 |
| 6-4 | Pinch Roller Pressure Measurement | 6-6 |
| 6-5 | Pinch Roller Pressure Adjustment | 6-6 |
| 6-6 | Capstan Servo Control P.C.B. | 6-7 |
| 6-7 | Control Timing Chart | 6-8 |
| 6-8 | Recording Process Timing Chart | 6-9 |
| 7-1 | Filter Schematics | 7-4 |
| 7-2 | Test Tape Loading | 7-9 |
| 7-3 | Electronics Access | 7-13 |
| 7-4 | Reproduce System Block and Level Diagram | 7-14 |
| 7-5 | Head Assembly | 7-15 |
| 7-6 | Location of Record/Reproduce Electronics | 7-17 |
| 7-7 | Overall Frequency Response | 7-20 |
| 7-8 | Record System Block and Level Diagram | 7-21 |
| Figure | Title | Page |
|---|---|---|
| 7-9 | Bias Current v.s. Output and Distortion | 7-21 |
| 7-10 | Input v.s. Output and Distortion | 7-22 |
| 7-11 | Location of Record/Reproduce Electronics | 7-22 |
| 7-12 | Location of AMP. Control Electronics | 7-25 |
| 8-1 | Reel Motor Mounting | 8-1 |
| 8-2 | Brake Assembly | 8-2 |
| 8-3 | Location of DC Servo Capstan Motor | 8-5 |
| 8-4 | Pinch Roller Removal | 8-6 |
| 8-5 | Head Assembly | 8-8 |
| 8-6 | Head Alignment | 8-8 |
| Table | Title | Page |
|---|---|---|
| 1-1 | Standard Accessories | 1-5 |
| 1-2 | Optional Accessories | 1-5 |
| 1-3 | Specifications | 1-6 |
| 2-1 | Standard Switch Position on Shipment | 2-5 |
| 2-2 | Rear Connector Panel | 2-6 |
| 3-1 | Tape Transport Controls and Indicators | 3-1 |
| 3-2 | Record/Reproduce Electronics Controls and Indicators | 3-7 |
| 4-1 | Test and Maintenance Equipment | 4-1 |
| 4-2 | Flutter Test Tapes | 4-2 |
| 4-3 | Reproduce Alignment Test Tape | 4-2 |
| 5-1 | Record Level | 5-6 |
| 5-2 | Fuse Information | 5-9 |
| 6-1 | Braking Force Specifications | 6-3 |
| 7-1 | Signal-to-Noise Specifications | 7-5 |
| 7-2 | Flutter and Wow Specification | 7-11 |
| 7-3 | Equalizer Time Constants & Fluxivity | 7-17 |
| 7-4 | Standard Level | 7-25 |
| 9-1 | Troubleshooting Hints for Amplifiers | 9-2 |
| 9-2 | Troubleshooting Hints for Transport | 9-2 |
| 10-1 | Safety Component | 10-2 |