Yamaha Mx12.6 Service Manual
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Page 11
![Page 11
MX12/6
MX20/6
11
+30dB
+20dB
+10dB
0dB
–10dB
–20dB
–30dB
–40dB
–50dB
–60dB
STEREO [0dB]2dB]FECT [-6dB]EREO [-6dB]Max. Before Clip
AUX SEND [+4dB]
EFFECT SEND [+4dB]
AUX
EFFECT
Control MasterGROUP
Fader MasterMax. Before Clip
GROUP OUT [+4dB]
REC OUT [-10dBV]
ST
FaderMasterMONO Master
ControlMax. Before Clip
ST OUT, MONO OUT [+4dB]
C-R/PHONESC-R/PHONES [+4dB@10kohms]
C-R/PHONES
[3mW@40ohms]
STEREO R
EFFECTSTEREO LGROUP4AUX1
AUX2 STEREO R
EFFECT STEREO L
GROUP4AUX1
AUX2
GROUP1 Fader
[0dB]
INV
INV
INV
INV...](http://img.usermanuals.tech/thumb/83/103362/w300_d_1513000947-yamaha-mx12-6-service-manual_d-10.png "Page 11
MX12/6
MX20/6
11
+30dB
+20dB
+10dB
0dB
–10dB
–20dB
–30dB
–40dB
–50dB
–60dB
STEREO [0dB]2dB]FECT [-6dB]EREO [-6dB]Max. Before Clip
AUX SEND [+4dB]
EFFECT SEND [+4dB]
AUX
EFFECT
Control MasterGROUP
Fader MasterMax. Before Clip
GROUP OUT [+4dB]
REC OUT [-10dBV]
ST
FaderMasterMONO Master
ControlMax. Before Clip
ST OUT, MONO OUT [+4dB]
C-R/PHONESC-R/PHONES [+4dB@10kohms]
C-R/PHONES
[3mW@40ohms]
STEREO R
EFFECTSTEREO LGROUP4AUX1
AUX2 STEREO R
EFFECT STEREO L
GROUP4AUX1
AUX2
GROUP1 Fader
[0dB]
INV
INV
INV
INV...")
MX12/6 MX20/6 11 +30dB +20dB +10dB 0dB –10dB –20dB –30dB –40dB –50dB –60dB STEREO [0dB]2dB]FECT [-6dB]EREO [-6dB]Max. Before Clip AUX SEND [+4dB] EFFECT SEND [+4dB] AUX EFFECT Control MasterGROUP Fader MasterMax. Before Clip GROUP OUT [+4dB] REC OUT [-10dBV] ST FaderMasterMONO Master ControlMax. Before Clip ST OUT, MONO OUT [+4dB] C-R/PHONESC-R/PHONES [+4dB@10kohms] C-R/PHONES [3mW@40ohms] STEREO R EFFECTSTEREO LGROUP4AUX1 AUX2 STEREO R EFFECT STEREO L GROUP4AUX1 AUX2 GROUP1 Fader [0dB] INV INV INV INV...
Page 12
MX12/6 MX20/6 12 WIRING CN208 A ACN404 CN401 CN501 CN502 CN402CN403CN203 CN303 ( MX20/6 only)( MX12/6 only) CN 2/22/4 1/2 ( MX12/6) to MAIN1/4 CN207 IN8-CN403 ( MX20/6)toMto IN IN8MAIN IN8 M DCJ K
Page 13
MX12/6 MX20/6 13 A A CN207 CN201CN202 2/2 1/4 CN204 CN304 CN305 CN105 CN302CN301 1/2 CN107 CN108 CN207to MAIN1/4 CN207( MX12/6) to IN8-CN403( MX20/6) CN106 to MAIN4/4 CN305 CN109 CN102CN104 CN103 CN101AC POWER SWITCH POWER TRANSFORMER 3/4 CN306 DCJK MAIN DCJK MAIN 4/4 MAIN
Page 14
MX12/6 MX20/6 14 CIRCUIT BOARD LAYOUT 2/2( MX20/6 model only)2/2 2/2 2/4 ( MX20/6 model only)1/2 1/41/2 3/4 4/4 IN8 DCJK DCJK MAIN IN8 MAINDCJK MAIN MAIN
Page 15
![Page 15
MX12/6
MX20/6
15
DISASSEMBLY PROCEDURE
Fig.1 1. Panel Assembly
1-1. With the unit placed so that the rear panel faces
forward, remove the screws marked [30] and lift the
rear panel. The panel assembly can then be
removed. (Fig. 1)
[30]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) MX12/6: 18 screws MX20/6: 19 screws
View A
[30] [30]Rear side
Rear side
[30] [30]
[30]
[30] [30]Top side
MX12/6
MX20/6Side view
[30]](http://img.usermanuals.tech/thumb/83/103362/w300_d_1513000947-yamaha-mx12-6-service-manual_d-14.png "Page 15
MX12/6
MX20/6
15
DISASSEMBLY PROCEDURE
Fig.1 1. Panel Assembly
1-1. With the unit placed so that the rear panel faces
forward, remove the screws marked [30] and lift the
rear panel. The panel assembly can then be
removed. (Fig. 1)
[30]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) MX12/6: 18 screws MX20/6: 19 screws
View A
[30] [30]Rear side
Rear side
[30] [30]
[30]
[30] [30]Top side
MX12/6
MX20/6Side view
[30]")
MX12/6 MX20/6 15 DISASSEMBLY PROCEDURE Fig.1 1. Panel Assembly 1-1. With the unit placed so that the rear panel faces forward, remove the screws marked [30] and lift the rear panel. The panel assembly can then be removed. (Fig. 1) [30]: Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) MX12/6: 18 screws MX20/6: 19 screws View A [30] [30]Rear side Rear side [30] [30] [30] [30] [30]Top side MX12/6 MX20/6Side view [30]
Page 16
![Page 16
MX12/6
MX20/6
16
Fig.2
[P50]:Hexagonal Button-P 3 X 25 MFZNBL (V3289800)
[P60]:Bonding Tapping Screw-B 3.0 X 8 MFZN2BL (VN413300)
[P70]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
2. MAIN 1/4 Circuit Board
2-1.Remove the panel assembly. (See Procedure 1.)
2-2.Remove the twelve (12) screws marked [P50A], the
twenty-three (23) screws marked [P60A], each knob
and hexagonal nut. The MAIN 1/4 circuit board can
then be removed. (Fig. 2)
3. MAIN 4/4 Circuit Board
3-1.Remove the panel assembly. (See...](http://img.usermanuals.tech/thumb/83/103362/w300_d_1513000947-yamaha-mx12-6-service-manual_d-15.png "Page 16
MX12/6
MX20/6
16
Fig.2
[P50]:Hexagonal Button-P 3 X 25 MFZNBL (V3289800)
[P60]:Bonding Tapping Screw-B 3.0 X 8 MFZN2BL (VN413300)
[P70]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
2. MAIN 1/4 Circuit Board
2-1.Remove the panel assembly. (See Procedure 1.)
2-2.Remove the twelve (12) screws marked [P50A], the
twenty-three (23) screws marked [P60A], each knob
and hexagonal nut. The MAIN 1/4 circuit board can
then be removed. (Fig. 2)
3. MAIN 4/4 Circuit Board
3-1.Remove the panel assembly. (See...")
MX12/6 MX20/6 16 Fig.2 [P50]:Hexagonal Button-P 3 X 25 MFZNBL (V3289800) [P60]:Bonding Tapping Screw-B 3.0 X 8 MFZN2BL (VN413300) [P70]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) 2. MAIN 1/4 Circuit Board 2-1.Remove the panel assembly. (See Procedure 1.) 2-2.Remove the twelve (12) screws marked [P50A], the twenty-three (23) screws marked [P60A], each knob and hexagonal nut. The MAIN 1/4 circuit board can then be removed. (Fig. 2) 3. MAIN 4/4 Circuit Board 3-1.Remove the panel assembly. (See...
Page 17
![Page 17
MX12/6
MX20/6
17
Fig.3
[B70]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
[B90]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
[B100]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
6. DCJK 1/2 Circuit Board
6-1.Remove the panel assembly. (See Procedure 1.)
6-2. Remove the nine (9) screws marked [B90] and pull off
the DCJK 1/2 circuit board from the PCB support. (Fig. 3)
7. Heat Sink
7-1.Remove the panel assembly. (See Procedure 1.)
7-2. Remove the five (5) screws marked [B70]. The...](http://img.usermanuals.tech/thumb/83/103362/w300_d_1513000947-yamaha-mx12-6-service-manual_d-16.png "Page 17
MX12/6
MX20/6
17
Fig.3
[B70]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
[B90]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
[B100]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190)
6. DCJK 1/2 Circuit Board
6-1.Remove the panel assembly. (See Procedure 1.)
6-2. Remove the nine (9) screws marked [B90] and pull off
the DCJK 1/2 circuit board from the PCB support. (Fig. 3)
7. Heat Sink
7-1.Remove the panel assembly. (See Procedure 1.)
7-2. Remove the five (5) screws marked [B70]. The...")
MX12/6 MX20/6 17 Fig.3 [B70]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) [B90]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) [B100]:Bind Head Tapping Screw-B 3.0 X 8 MFZN2BL (EP600190) 6. DCJK 1/2 Circuit Board 6-1.Remove the panel assembly. (See Procedure 1.) 6-2. Remove the nine (9) screws marked [B90] and pull off the DCJK 1/2 circuit board from the PCB support. (Fig. 3) 7. Heat Sink 7-1.Remove the panel assembly. (See Procedure 1.) 7-2. Remove the five (5) screws marked [B70]. The...
Page 18
MX12/6 MX20/6 18 LSI PIN DESCRIPTION PINNo.NAME I/O FUNCTION PIN No.NAME I/O FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 5253 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ED2 ED3 ED4 ED5 ED6 ED7 VSS VDD CLKM0 CLKM1 TMS TDI TCK CLKIN VSS VDD CLKO EA12/ED8 EA13/ED9 EA14/ED10 EA15/ED11 VSS VDD EA16/ED12...
Page 19
MX12/6 MX20/6 19 PIN No.NAME I/O FUNCTION PIN No.NAME I/O FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 13 1415 16 17 18 19 20 21 22 23 24 25 26 27 28 VINL Vcc1 AGND1 VREFL VREFR VINR CINPR CINNR CINNL CINPL VCOM VOUTR AGND2 Vcc2VOUTL LRCIN BCKIN DIN DOUT XTI XTO CLKIO VDD DGND FMT2 FMT1 FMT0 RSTB I I OO I I I O I O I/O I I I I PCM3001E (XY282A00) ADAMAIN: ICM04 ADC Analog Input, Lch ADC Analog Power Supply ADC Analog GND ADC Reference decouple, Lch ADC Reference Decouple, Rch ADC Analog Input, Rch ADC...
Page 20
MX12/6 MX20/6 20 IC BLOCK DIAGRAM NJM4580L (XF195A00) Operational AmplifierTC74HCU04AP (IG142200) Inverter M5229P (XG203A00) 7-SEG. GRAPHICBA682A (XS046A00) LED Level Meter 1A2345678 IN V+IN OUT AAA+V IN+IN OUT BBB +B+ 1A2345678 IN V+IN OUT AAA+V IN+IN OUT BBB +B+ 1A2345678 IN V+IN OUT AAA+V IN+IN OUT BBB +B+ 1A2345678 IN V+IN OUT AAA+V IN+IN OUT BBB +B+ (MX12/6 MAIN, MA20/6 MAIN: IC101,IC201,IC301, IC401, IC501, IC601, IC701, IC801, ICD02, ICE02, ICF04, ICG04, ICH04, ICI31, ICI61) (MX12/6 MAIN,...