Yamaha Mg12.4 Service Manual
Here you can view all the pages of manual Yamaha Mg12.4 Service Manual. The Yamaha manuals for Music Mixer are available online for free. You can easily download all the documents as PDF.
Page 11
11 MG12/4 MG16/4 Connector Polarities * These jacks will also accept connection to monaural phone plugs. If you use monaural plugs, the connection will be unbalanced. MIC INPUT, ST OUTPin 1: Ground Pin 2: Hot (+) Pin 3: Cold (–) LINE INPUT (monaural channels), GROUP OUT, ST OUT, C-R OUT AUX1, AUX2 *Tip: Hot (+) Ring: Cold (–) Sleeve: Ground INSERT I/OTip: Output Ring: Input Sleeve: Ground PHONESTip: L Ring: R Sleeve: Ground RETURN LINE INPUT (stereo channels)Tip: Hot Sleeve: Ground INPUT OUTPUT Ring...
Page 12
12 MG12/4 MG16/4 Shrink tube (Seven places)¢ ä ) V½á”ÒU t£ Redž§Brown½ß Black«é WA595400 WE735800 MG12/4 CIRCUIT BOARD LAYOUT & WIRING PS Power switch and AC connector wiring MAIN JACK 1/2 JACK 1/2JACK 2/2 ¢.( âÇ¿Äè ž¢ÄÍA ¢ $£ ¢ ?oµ ¿½q$¯É«»wA ¢£
Page 13
13 MG12/4 MG16/4 WC703300 (7 places) CN571 (JACK 1/2 circuit board) --- CN501 (MAIN circuit board) CN771 (JACK 1/2 circuit board) --- CN701 (MAIN circuit board) CN971 (JACK 1/2 circuit board) --- CN901 (MAIN circuit board) CNA71 (JACK 1/2 circuit board) --- CNA01 (MAIN circuit board) CND71 (JACK 1/2 circuit board) --- CND01 (MAIN circuit board) CNE71 (JACK 1/2 circuit board) --- CNE01 (MAIN circuit board) CNG71 (JACK 1/2 circuit board) --- CNG01 (MAIN circuit board)MAIN circuit board WE521500MAIN circuit...
Page 14
14 MG12/4 MG16/4 Shrink tube (Seven places)¢ ä ) V½á”ÒU t£ Redž§Brown½ß Black«é WA595400 WE735800 MG16/4 CIRCUIT BOARD LAYOUT & WIRING PS MAIN Power switch and AC connector wiring JACK 1/2 JACK 2/2JACK 1/2 ¢.( âÇ¿Äè ž¢ÄÍA ¢ $£ ¢ ?oµ ¿½q$¯É«»wA ¢£
Page 15
15 MG12/4 MG16/4 WE735800 WD361600 CN02PS circuit board WE522200 CN01 WC703300 (9 places) CN171 (JACK 1/2 circuit board) --- CN101 (MAIN circuit board) CN371 (JACK 1/2 circuit board) --- CN301 (MAIN circuit board) CN571 (JACK 1/2 circuit board) --- CN501 (MAIN circuit board) CN771 (JACK 1/2 circuit board) --- CN701 (MAIN circuit board) CN971 (JACK 1/2 circuit board) --- CN901 (MAIN circuit board) CNA71 (JACK 1/2 circuit board) --- CNA01 (MAIN circuit board) CND71 (JACK 1/2 circuit board) --- CND01 (MAIN...
Page 16
![Page 16
16 MG12/4
MG16/4
2. Bottom Cover
(Time required : About 3 min.)
2-1. Remove the rack mount angle L and R.
(See procedure 1)
2-2. Remove the eight (8) screws marked [500]. The bottom
cover can then be removed. (Fig. 1)
1. Rack Mount Angle
(Time required : About 1 min.)
1-1.Remove the two (2) screws marked [510A]. The rack
mount angle L can then be removed. (Fig. 1)
1-2. Remove the two (2) screws marked [510B]. The rack
mount angle R can then be removed. (Fig. 1)
Rack mount angle R Rack mount angle L
(Fig....](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-15.png "Page 16
16 MG12/4
MG16/4
2. Bottom Cover
(Time required : About 3 min.)
2-1. Remove the rack mount angle L and R.
(See procedure 1)
2-2. Remove the eight (8) screws marked [500]. The bottom
cover can then be removed. (Fig. 1)
1. Rack Mount Angle
(Time required : About 1 min.)
1-1.Remove the two (2) screws marked [510A]. The rack
mount angle L can then be removed. (Fig. 1)
1-2. Remove the two (2) screws marked [510B]. The rack
mount angle R can then be removed. (Fig. 1)
Rack mount angle R Rack mount angle L
(Fig....")
16 MG12/4 MG16/4 2. Bottom Cover (Time required : About 3 min.) 2-1. Remove the rack mount angle L and R. (See procedure 1) 2-2. Remove the eight (8) screws marked [500]. The bottom cover can then be removed. (Fig. 1) 1. Rack Mount Angle (Time required : About 1 min.) 1-1.Remove the two (2) screws marked [510A]. The rack mount angle L can then be removed. (Fig. 1) 1-2. Remove the two (2) screws marked [510B]. The rack mount angle R can then be removed. (Fig. 1) Rack mount angle R Rack mount angle L (Fig....
Page 17
![Page 17
17 MG12/4
MG16/4
3. PS Circuit Board
(Time required : About 4 min.)
3-1. Remove the rack mount angle L and R.
(See procedure 1)
3-2. Remove the bottom cover. (See procedure 2)
3-3.Remove the two (2) screws marked [480]. The PS circuit
board and heat sink can then be removed. (Fig. 2)
* Replacing any part on the PS circuit board requires
removal of the heat sink as well. Use the following
procedure to remove the heat sink.
3-4. Remove the two (2) screws marked [A] fixing IC01 and
IC05. (Photo 1)
3-5....](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-16.png "Page 17
17 MG12/4
MG16/4
3. PS Circuit Board
(Time required : About 4 min.)
3-1. Remove the rack mount angle L and R.
(See procedure 1)
3-2. Remove the bottom cover. (See procedure 2)
3-3.Remove the two (2) screws marked [480]. The PS circuit
board and heat sink can then be removed. (Fig. 2)
* Replacing any part on the PS circuit board requires
removal of the heat sink as well. Use the following
procedure to remove the heat sink.
3-4. Remove the two (2) screws marked [A] fixing IC01 and
IC05. (Photo 1)
3-5....")
17 MG12/4 MG16/4 3. PS Circuit Board (Time required : About 4 min.) 3-1. Remove the rack mount angle L and R. (See procedure 1) 3-2. Remove the bottom cover. (See procedure 2) 3-3.Remove the two (2) screws marked [480]. The PS circuit board and heat sink can then be removed. (Fig. 2) * Replacing any part on the PS circuit board requires removal of the heat sink as well. Use the following procedure to remove the heat sink. 3-4. Remove the two (2) screws marked [A] fixing IC01 and IC05. (Photo 1) 3-5....
Page 18
![Page 18
18 MG12/4
MG16/4
Side cover RSide cover L
[440B]
[440B]
[440B] [480] [480][440A]
[440A]
[440A] [450B]
[450B][450A]
[450A] [450C]
[450C]
[430B]
[430B] [430D]
[430D]
[460] [460]Fader knobs
Hexagonal nuts
Hexagonal nuts
[430C][430A]
PS
PS
(Fig. 2) [430]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2B3 (WE877800)
[440]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900)
[450]: Hex. Socket Set Screw-S 3.0 x 6 MFZN2B3 (WF419300)
[460]: Bonding Tapping Screw-B 3.0 x 10 MFZN2B3 (WE878000)
[480]: Bind Head Tapping...](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-17.png "Page 18
18 MG12/4
MG16/4
Side cover RSide cover L
[440B]
[440B]
[440B] [480] [480][440A]
[440A]
[440A] [450B]
[450B][450A]
[450A] [450C]
[450C]
[430B]
[430B] [430D]
[430D]
[460] [460]Fader knobs
Hexagonal nuts
Hexagonal nuts
[430C][430A]
PS
PS
(Fig. 2) [430]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2B3 (WE877800)
[440]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900)
[450]: Hex. Socket Set Screw-S 3.0 x 6 MFZN2B3 (WF419300)
[460]: Bonding Tapping Screw-B 3.0 x 10 MFZN2B3 (WE878000)
[480]: Bind Head Tapping...")
18 MG12/4 MG16/4 Side cover RSide cover L [440B] [440B] [440B] [480] [480][440A] [440A] [440A] [450B] [450B][450A] [450A] [450C] [450C] [430B] [430B] [430D] [430D] [460] [460]Fader knobs Hexagonal nuts Hexagonal nuts [430C][430A] PS PS (Fig. 2) [430]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2B3 (WE877800) [440]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900) [450]: Hex. Socket Set Screw-S 3.0 x 6 MFZN2B3 (WF419300) [460]: Bonding Tapping Screw-B 3.0 x 10 MFZN2B3 (WE878000) [480]: Bind Head Tapping...
Page 19
![Page 19
19 MG12/4
MG16/4
(Photo 1)
[420]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900)
(Fig. 3) Push HPF buttons
Hooks
Push HPF buttons
Push HPF buttons Push ON buttons
Push PFL buttons
Push PFL buttons
Sleeve ON buttons
[420] [420] [420]Hexagonal nuts
MIX1 support (upper)
MIX1 support (lower)
MIX2 support
Meter cover
Meter reflector
[B] IC01 IC02 IC03IC05 Q01 [B] [A] [A]
PS
PS
JACK
2/2
MAIN * The upper and lower MIX1 support each can then be
removed in the same manner.
5-13. Detach the meter cover from...](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-18.png "Page 19
19 MG12/4
MG16/4
(Photo 1)
[420]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900)
(Fig. 3) Push HPF buttons
Hooks
Push HPF buttons
Push HPF buttons Push ON buttons
Push PFL buttons
Push PFL buttons
Sleeve ON buttons
[420] [420] [420]Hexagonal nuts
MIX1 support (upper)
MIX1 support (lower)
MIX2 support
Meter cover
Meter reflector
[B] IC01 IC02 IC03IC05 Q01 [B] [A] [A]
PS
PS
JACK
2/2
MAIN * The upper and lower MIX1 support each can then be
removed in the same manner.
5-13. Detach the meter cover from...")
19 MG12/4 MG16/4 (Photo 1) [420]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900) (Fig. 3) Push HPF buttons Hooks Push HPF buttons Push HPF buttons Push ON buttons Push PFL buttons Push PFL buttons Sleeve ON buttons [420] [420] [420]Hexagonal nuts MIX1 support (upper) MIX1 support (lower) MIX2 support Meter cover Meter reflector [B] IC01 IC02 IC03IC05 Q01 [B] [A] [A] PS PS JACK 2/2 MAIN * The upper and lower MIX1 support each can then be removed in the same manner. 5-13. Detach the meter cover from...
Page 20
20 MG12/4 MG16/4 Hexagonal nut and flat washer ¢á¯Æ¿