Yamaha pm1200 mixing console service manual

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PROFESSIONAL

AUDIO MIXING CONSOLE

.CONIENTS (E 5X)

SPECIFICATIONS (Igfiiflfi) ................................ 1
DIMENSIONS (man) ........... 6
PANELLAYOUT(/\°$lbI/f7'7 I) ......... .. 7
CIRCUIT BOARD LAYOUT (1: v I I/ f 7 V I) ............... 10
BLOCK DIAGRAM Er LEVEL DIAGRAM
(7D779'4775AEVMl/7'I77'7A) ....................... 11
DISASSEMBLY PROCEDURE (fimiiiifi) ...................... 13
ADJUSTMENT (3%] E) ........................... 17
IC BLOCK DIAGRAM (IC 7:! 7 7 ........................ 19
ASSOCIATED POWER SUPPLY UNIT
(PM I 2000) ST-INPUT T: /' ; -;w>ia§§rt fiméfil: v I) .. 20
INPUT MODULE/Circuit Diagram ............. ... .. 21
/Circuit Board. . ,. .. 23
/Block Diagram .............................. 24
ST INPUT MODULE /Circuit Diagram .......................... 25
/Circuit Board .. .. 27
/B|ock Diagram ........................... 28

LM Wésg.

PM1200

SERVICE MANUAL

GROUP1,2,3 and 4 CIRCUIT BOARDS /Circuit Diagram ......... 28
/Circuit Board .,, . . 31

/Block Diagram .......... 32

ST CIRCUIT BOARD /Circuit Diagram ......................... 33
/Circuit Board. . .. . 35

/Block Diagram ..
CUE CIRCUIT BOARD /Circuit Diagram
/Circuit Board . .
/Block Diagram .
TB CIRCUIT BOARD /Circuit Diagram ................
/Circuit Board ..................
/BIock Diagram.
PW 1200 /Circuit Diagram ......
/Circuit Board. ..
MT CIRCUIT BOARD/Circuit Diagram ......................... 49
/Circuit Board. . ..
/BIock Diagram .......................... 50

INSTALLATION OF OPTIONAL INPUT TRANSFORMERS
(4 V7~7 r bayxmfixfiw) ...........................

PARTS LIST

YAMAHA CORP.

HAMAMATSU, JAPAN
2.22K-984 6) Printed in Japan "89.12

PMI 206

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fl

PM1200

/

IMPORTANT NOTICE

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha
Products, are already known and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product
may result in personal injury, destruction of expensive components and failure of the
product to perform as specified. For these reasons, we advise all Yamaha product owners
that all service required should be performed by an authorized Yamaha Retailer or the
appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute
authorization, certification, recognition of any applicable technical capabilities, or
establish a principle-agent, relationship of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The
research, engineering, and service departments of Yamaha are continually striving to improve Yamaha
products. Modifications are, therefore, inevitable and changes in specification are subject to change without
notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors
Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your
body may have accumulated by grounding yourself to the ground buss in the unit (heavy
gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Rechecka_vaork before
you apply power to the unit.