Yamaha Mg12.4 Service Manual
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Page 22
22 MG12/4 MG16/4 4. Side Cover (Time required : About 5 minutes each.) 4-1. Remove the bottom cover. (See procedure 2) 4-2. Side Cover L : 4-2-1. Remove the rack mount angle L. (See procedure 1) 4-2-2.Remove the screw marked [430A], three (3) screws marked [430B], three (3) screws marked [440A] and two (2) screws marked [450A]. The side cover L can then be removed. (Fig. 2) 4-3. Side Cover R : 4-3-1. Remove the rack mount angle R. (See procedure 1) 4-3-2. Remove the PS circuit board. (See procedure 3)...
Page 23
23 MG12/4 MG16/4(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) Side cover RSide cover L [440B] [440B] [440B][440A] [440A] [440A] [450A] [450A] [450B] [450B] [450C] [450C] [430B] [430B] [430B] [430D] [430D] [430D] [460] [460]Fader knobs Hexagonal nuts Hexagonal nuts [430C] MIX [430A] Volume knobs MAIN MAIN...
Page 24
24 MG12/4 MG16/4 [420] [420] [420] [420] [420] Push HPF buttons Hooks Hexagonal nuts MIX1 support (upper) MIX1 support (lower) Push PFL buttons Meter cover Push HPF buttons ¢Ø»ï0/TTŸZ£ Push HPF buttons MIX2 support Sleeve ON buttons Push PFL buttons [420]: Bind Head Tapping Screw-S 3.0 x 6 MFZN2W3 (WE877900) (Fig. 3)Meter reflector MAIN JACK 2/2 5-8. Remove the hexagonal nut. The JACK 2/2 circuit board can then be removed from the MIX1 support. (Fig. 3) 5-9.Pull out the eighty-nine (89) volume...
Page 25
25 MG12/4 MG16/4 6. Power Switch and AC Connector (Time required : About 6 minutes each.) 6-1. Remove the rack mount angle L and R. (See procedure 1) 6-2. Remove the bottom cover. (See procedure 2) 6-3. Remove the PS circuit board. (See procedure 3) 6-4. Remove the side cover R. (See procedure 4) 6-5. Remove the power switch by bending its claw. (Photo 2) 6-6. To remove the AC connector, remove the hexagonal nut and flat washer. (Photo 2) (Photo 2) ?o
Page 26
26 MG12/4 MG16/4 IC BLOCK DIAGRAM NJM2068M-D(TE2) (X3505A00) Dual Operational Amplifier MG12/4 MAIN, MG16/4 MAIN: IC502, 503, IC702, 703, 902-904, ICA02-04, ICB01-03, ICC01-03, ICD01-03, ICE01, 03, ICF01, ICG01-05 MG16/4 MAIN: IC102, 103, 302, 303 NJM4556AL (XP844A00) Dual Operational Amplifier MG12/4 MAIN, MG16/4 MAIN: ICH03 NJM4580ED (XT157A00) Dual Operational Amplifier MG12/4 MAIN, MG16/4 MAIN: IC501, 601, IC701, 801, 901, ICA01, ICE02, ICF02, ICG06,...
Page 27
27 MG12/4 MG16/4 to MAIN-CNF01 to Power switch, AC connector : not installed CIRCUIT BOARDS MG12/4 MAIN (X6346C0) ................................. 34/36 MG12/4 JACK 1/2 (X6353B0) ............................... 38 MG12/4 JACK 2/2 (X6353B0) ............................... 37 MG16/4 MAIN (X6345C0) ................................. 28/30 MG16/4 JACK 1/2 (X6254B0) .......................... 32/33 MG16/4 JACK 2/2 (X6254B0) ............................... 33 PS (X6343B0)...
Page 28
28 MG12/4 MG16/4 GAIN HPF HIGH MID LOW AUX1 PRE AUX2 PA N ST PFL 1-2 1 2 3 4 5 6 7 8 9/10 11/12 PAN/BAL PAN/BA PEAK PEAK PEAK PEAK PEAK PEAK PEAK PEAK PEAK PEAK to JACK 1/2-CN171 to JACK 1/2-CN371 to JACK 1/2-CN571 to JACK 1/2-CN771 to JACK 1/2-CN971 to J A A MG16/4 MAIN Circuit Board MAIN: 2NA-WE52160
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29 MG12/4 MG16/4 0 11/12 13/14 15/16 BAL PAN/BAL BAL BAL STST C-R/PHONES AUX2 AUX1 AUX2 TO ST ST/ GROUP AUX1 ST GROUP 1-2 PHANTOM +48V 2TR IN RETURN SEND 2TR IN PEAK+5 +3 +1 0 -1 -3 -5 -7 -10 -15 -20 LSTR 12POWER PEAK 2-CN971 to JACK 1/2-CNA71 to JACK 1/2-CND71 to JACK 1/2-CNE71 to JACK 1/2-CNG71 to PS-CN02 to JACK 2/2-CNH02 A A Component side MAIN: 2NA-WE52160 ¢ æ ¼£