MX-5050B Maintenance Manual — Digital Edition · Part 0 · scan pages 3-8

Front Matter

MX-5050 SERIES PROFESSIONAL RECORDERS — INTRODUCTION↑ TOP

This manual is a maintenance supplement to the MX-5050B series instruction manual, catalog No. OS1-011, and provides detailed maintenance information.

This manual is intended for use by qualified maintenance or service personnel only.

Prior to using this manual, it is suggested that the user become familiar with the information contained in the basic manual.

MX-5050 Recorder (2-Channel Version) ⤢ zoomMX-5050 Recorder (2-Channel Version)

COMMUNICATION WITH OTARI — FOR SERVICE INFORMATION AND PARTS↑ TOP

OTARI PRODUCTS are manufactured under strict quality control and each unit is carefully tested and inspected prior to shipment from our factory.

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

OTARI ELECTRIC CO.,LTD.	OTARI CORPORATION
4-29-18, Minami Ogikubo,	981 Industrial Road, San Carlos,
Suginamiku, Tokyo, 167, Japan	California 94070, U.S.A.
Phone: (03) 333-9631	Phone: (415) 593-1648
Telex No.: OTRDENKI J26604	Telex No.: TWX 910-376-4890

Another part of Otari's continous technical support program for our products is the continous revision of manuals as equipment is improved or modified.

In order for you to receive information and service applicable to your equipment, and for technical support to function properly, please include the following information, most of which can be obtained from the name plate on the equipment, when you communicate with Otari.

Model Number
Serial Number
Date of purchase
Name and address of dealer from whom unit was purchased
Power requirements (voltage and frequency)
Manual number to which you are referring

LIST OF ILLUSTRATINS↑ TOP

Figure	Title	Page
2-1	Lifting the Head Cover	2-2
2-2	Demagnetizing	2-3
2-3	Lubrication	2-4
2-4	Starting Capacitor	2-6
2-5	Capstan Assembly	2-7
2-6	Junction Terminals	2-7
2-7	Location of Tape Speed Conversion Switch	2-8
2-8	Main Power Fuse Location	2-10
2-9	Internal Fuse Location	2-11
2-10	Rotating Coutrol p.c.b	2-11
3-1	Tape Transport Access	3-1
3-2	Brake Measurement	3-3
3-3	Brake Assembly Location	3-3
3-4	Pinch Roller Pressure Measurement	3-5
3-5	Pinch Roller Pressure Adjustment	3-5
3-6	Capstan Servo Control P.C.B	3-6
3-7	Control Timing Chart	3-7
3-8	Recording Process Timing Chart	3-8
4-1	Filter Schematics	4-3
4-2	Test Tape Loading	4-8
4-3	Electronics Access	4-11
4-4	Reproduce System Simplified Diagram	4-12
4-5	Head Assembly	4-13
4-6	Location of Record/Reproduce Electronics	4-15
4-7	Overall Frequency Response	4-18
4-8	Record System Simplified Diagram	4-19
4-9	Bais Current v.s Output and Distortion	4-19
4-10	Input v.s Output and Distortion	4-20
4-11	Location of Record/Reproduce Electronics	4-20
4-12	VU meter Amplifier P.C.B	4-23
5-1	Reel Motor Mounting	5-1
5-2	Brake Assembly	5-2
5-3	Location of DC Servo Capstan Motor	5-4
5-4	Hysteresis Synchronous Capstan Motor	5-5
5-5	Pinch Roller Removal	5-6
5-6	Head Assembly	5-8
5-7	Head Alignment	5-9

LIST OF TABLES↑ TOP

Table	Title	Page
1-1	Test and Maintenance Equipment	1-1
1-2	Flutter Test Tapes	1-3
1-3	Reproduce Alignment Test Tape	1-3
2-1	Record Level Switch Position	2-5
2-2	Required Parts	2-6
2-3	Fuse Information	2-10
3-1	Brake Force Specification	3-3
4-1	Signal-to-Noise Specifications	4-4
4-2	Crosstalk Specifications	4-6
4-3	Flutter and Wow Specifications	4-10
4-4	SRL Level of MX-5050B	4-15
4-5	Standard Reference Level of MX-5050B	4-15

TABLE OF CONTENTS↑ TOP

Section	Title	Page
1	GENERAL INFORMATION
1-1	Test and Maintenance Equipment Requirements	1-1
2	ROUTINE MAINTENANCE AND CONVERSION INFORMATION
2-1	Routine Maintenance	2-1
2-1-(1)	Cleaning	2-1
2-1-(2)	Demagnetizing	2-2
2-1-(3)	Lubrication	2-3
2-2	Tape Replacement	2-5
2-3	Equalizer Change	2-5
2-4	Frequency Conversion	2-6
2-5	Line Voltage Conversion	2-7
2-6	Tape Speed Conversion	2-8
2-6-(1)	Dc Servo Capstan Motor Model	2-8
2-6-(2)	Hysteresis Synchronous Motor Model	2-9
2-7	Fuse Replacement	2-9
3	TAPE TRANSPORT MAINTENANCE
3-1	Transport access	3-1
3-2	Brake Adjustment	3-2
3-3	Capstan Pinch Roller Pressure Adjustment	3-4
3-4	Capstan Speed Adjustment	3-6
3-5	Tape Transport Timing Chart	3-7
3-6	Recording Process Timing Chart	3-8
4	PERFORMANCE TESTING AND ELECTRONIC ALIGNMENT
4-1	General Notice	4-1
4-2	Test Tapes	4-2
4-3	Test Conditions	4-2
4-4	Performance Tests	4-3
4-4-(1)	Overall Signal-to-Noise	4-3
4-4-(2)	Overall Distortion Test	4-5
4-4-(3)	Crosstalk Test	4-6
4-4-(4)	Erasure Test	4-7
4-4-(5)	Tape Speed Measurement	4-7
4-4-(6)	Flutter and Wow Test	4-9
4-5	Access to Electronics Assembly	4-11
4-6	Electronic Alignment	4-12
4-6-(1)	Reproduce System	4-12
4-6-(2)	Reproduce Head Azimuth Adjustment	4-13
4-6-(3)	Frequency Response	4-14
4-6-(4)	SRL Adjustment	4-16
4-6-(5)	SEL.REP. Level Adjustment	4-16
4-6-(6)	Record System	4-16
4-6-(7)	Record Head Azimuth Adjustment	4-16
4-6-(8)	Record Bias Adjustment	4-17
4-6-(9)	Overall Frequency Response	4-21
4-6-(10)	Monitor Source Level Adjustment	4-22
4-6-(11)	Test Osc Level Adjustment	4-22
4-6-(12)	Record Level Adjustment	4-23
4-6-(13)	Peak Indicator Trigger Level Adjustment	4-23
5	MAJOR COMPONENT REPLACEMENT
5-1	Reel Motor Assembly Replacement	5-1
5-1-(1)	Reel Table Replacement and Height Adjustment	5-1
5-1-(2)	Reel Motor Replacement	5-2
5-1-(3)	Brake Band and Brake Solenoid Replacement	5-2
5-2	Power Transfomer Replacement	5-3
5-3	Capstan and Capstan Motor Replacement	5-4
5-3-(1)	Dc Capstan Motor	5-4
5-3-(2)	Hysteresis Synchronous Capstan Motor	5-5
5-4	Pinch Roller Replacement	5-6
5-5	Head Assembly Replacement	5-7
5-5-(1)	Description	5-7
5-5-(2)	Head Stack Replacement	5-7
5-5-(3)	Record and Reproduce Head Adjustment	5-9
5-5-(4)	Erase Head Alignment	5-9

Test Equipment and Test Tapes →