Yamaha Mg12.4 Service Manual
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Page 1
SERVICE MANUAL CONTENTS SPECIFICATIONS .........................................................3/5 DIMENSIONS .....................................................................7 PANEL LAYOUT .................................................8 MG12/4 CIRCUIT BOARD LAYOUT & WIRING ...............................12 MG16/4 CIRCUIT BOARD LAYOUT & WIRING ...............................14 MG12/4 DISASSEMBLY PROCEDURE ........16 MG16/4 DISASSEMBLY PROCEDURE ........21 IC BLOCK DIAGRAM...
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2 MG12/4 MG16/4 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...
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3 MG12/4 MG16/4 SPECIFICATIONS General Specifications Where 0 dBu = 0.775 V and 0 dBV = 1 V 1Measured with 12.7 kHz, –6 dB/oct. low pass filter (equivalent to 20 kHz, – ∞filter). (CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND) 2Turning PAN/BAL to left or right.3Shelving turnover/rolloff frequency: 3 dB before maximum cut or boost. Frequency Characteristics (ST OUT) 20 Hz–20 kHz +1 dB, –3 dB @+4 dBu, 600 Ω(with gain control at minimum level) Total Harmonic Distortion (ST OUT) 0.1 % (THD+N) @+14 dBu, 20...
Page 4
4 MG12/4 MG16/4 Input Specifications Where 0 dBu = 0.775 V and 0 dBV= 1 V* Input sensitivity: the lowest level that will produce the nominal output level when the unit is set to maximum gain. Output Specifications Where 0 dBu = 0.775 V and 0 dBV= 1 V Input ConnectorGainInput ImpedanceAppropriate ImpedanceSensitivity*Rated LevelMax. Before ClippingConnector Specifications MIC INPUT (MG16/4: CHs 1 to 8) (MG12/4: CHs 1 to 4)–60 3 kΩ50–600 Ω mic –80 dBu (0.078 mV)–60 dBu (0.775 mV)–40 dBu (7.75 mV)...
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5 MG12/4 MG16/4 Ù ïù“7 Ù° `“7 Î 0 dBu=0.775 V z 0 dBV=1 V qb” *1 @12.7 kHz, –6 dB/oct. wé”͵џ绔to ¢ @20 kHz, – ¿ dB/oct. ÑŸç»”t ì p£ ¢ CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND£ *2 PAN/BAL *3³£çÏכּ Ów»”璉̔ /é”ç¦Ñ * þ :7 GD! ït 0` 3 dB
Page 6
6 MG12/4 MG16/4 Ù Ö—“7 ÎE#V 7 zE#7 7 qb” *1 Ö—ò S7 G® ï Ìt ¨ Z—U ˜’•”7 –èÕç Ù Z—“7 Î 0 dBu=0.775 V z 0 dBV=1 V qb” Ö— z Ê ¶ ® ï Ö— ï Д¼ïµ &ù ïД¼ïµ ò S *1F èÕç7 GÊï« æ¿ÓèÕç z “7 MIC INPUT (MG16/4 CH1™ 8£ (MG12/4 CH1 ™ 4 £ –603 k 50™ 600 Ú « –80 dBu ¢ 0.078 mV£ –60 dBu ¢ 0.775 mV£ –40 dBu ¢ 7.75 mV£ XLR-3-31» Ó ¢Ìåïµ£ –16–36 dBu ¢ 12.3 mV £ –16 dBu ¢ 123...
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7 MG12/4 MG16/4 DIMENSIONS MG16/4 MG12/4 393 31.5 309.6 D 416.6 H 108 101.3 3 W 423 428 27.5 480 When mounted on rack 317.4 D 416.6 325.6 102.62 H 108W 322 480 322 When mounted on rack Units : mm ¢ GO $£ ¢å¿« “ ÇZÌ£ ¢å¿« “ ÇZÌ£
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![Page 8
8 MG12/4
MG16/4
q[GAIN] Control
w[PEAK] Indicator
e[
80 ] Switch (High Pass Filter)
rEqualizer ([HIGH], [MID], [LOW])
t[AUX1] and [AUX2] Controls
y[PRE] Switch
u[PAN] Control (MG16/4: CHs 1 to 8. MG12/
4: CHs 1 to 4)
[PAN/BAL] Control (MG16/4: CHs 9/10 and
11/12. MG12/4: CHs 5/6 and 7/8)
[BAL] Control (MG16/4: CHs 13/14 and 15/
16. MG12/4: CHs 9/10 and 11/12)
i[
] ST Switch
o[PFL] (Pre-Fader Listen) Switch
!0[GROUP] Switch
!1Channel Fader
PANEL LAYOUT
Note: Within this manual, all panel...](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-7.png "Page 8
8 MG12/4
MG16/4
q[GAIN] Control
w[PEAK] Indicator
e[
80 ] Switch (High Pass Filter)
rEqualizer ([HIGH], [MID], [LOW])
t[AUX1] and [AUX2] Controls
y[PRE] Switch
u[PAN] Control (MG16/4: CHs 1 to 8. MG12/
4: CHs 1 to 4)
[PAN/BAL] Control (MG16/4: CHs 9/10 and
11/12. MG12/4: CHs 5/6 and 7/8)
[BAL] Control (MG16/4: CHs 13/14 and 15/
16. MG12/4: CHs 9/10 and 11/12)
i[
] ST Switch
o[PFL] (Pre-Fader Listen) Switch
!0[GROUP] Switch
!1Channel Fader
PANEL LAYOUT
Note: Within this manual, all panel...")
8 MG12/4 MG16/4 q[GAIN] Control w[PEAK] Indicator e[ 80 ] Switch (High Pass Filter) rEqualizer ([HIGH], [MID], [LOW]) t[AUX1] and [AUX2] Controls y[PRE] Switch u[PAN] Control (MG16/4: CHs 1 to 8. MG12/ 4: CHs 1 to 4) [PAN/BAL] Control (MG16/4: CHs 9/10 and 11/12. MG12/4: CHs 5/6 and 7/8) [BAL] Control (MG16/4: CHs 13/14 and 15/ 16. MG12/4: CHs 9/10 and 11/12) i[ ] ST Switch o[PFL] (Pre-Fader Listen) Switch !0[GROUP] Switch !1Channel Fader PANEL LAYOUT Note: Within this manual, all panel...
Page 9
![Page 9
9 MG12/4
MG16/4
q[ST] Master Fader
w[GROUP 1-2] Fader
e[ TO ST ] Switch
rMaster SEND ([AUX1] and [AUX2] Controls)
tRETURN ([AUX1], [AUX2], and [ST] Controls)
y[2TR IN] Control
u[PHANTOM +48V] Switch
iLevel-Meter Signal Switches
(ST-GROUP Toggle Switch and 2TR IN Switch)
o[C-R/PHONES] Control
!0Level Meter
!1[POWER] Indicator
!2[PHONES] jack
y
u!2
!1
!0
o
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9 MG12/4
MG16/4
q[ST] Master Fader
w[GROUP 1-2] Fader
e[ TO ST ] Switch
rMaster SEND ([AUX1] and [AUX2] Controls)
tRETURN ([AUX1], [AUX2], and [ST] Controls)
y[2TR IN] Control
u[PHANTOM +48V] Switch
iLevel-Meter Signal Switches
(ST-GROUP Toggle Switch and 2TR IN Switch)
o[C-R/PHONES] Control
!0Level Meter
!1[POWER] Indicator
!2[PHONES] jack
y
u!2
!1
!0
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9 MG12/4 MG16/4 q[ST] Master Fader w[GROUP 1-2] Fader e[ TO ST ] Switch rMaster SEND ([AUX1] and [AUX2] Controls) tRETURN ([AUX1], [AUX2], and [ST] Controls) y[2TR IN] Control u[PHANTOM +48V] Switch iLevel-Meter Signal Switches (ST-GROUP Toggle Switch and 2TR IN Switch) o[C-R/PHONES] Control !0Level Meter !1[POWER] Indicator !2[PHONES] jack y u!2 !1 !0 o i t e r wq Master Control Section¢Úµ»”¯ïÄé”ç æ£ qÚµ»”Ñ£”¼” wÑ£”¼” eµ ¿½ r4&/%Úµ»” ¢z¯ïÄé”ç£ t3&563/...
Page 10
![Page 10
10 MG12/4
MG16/4
qChannel Input jacks
[MIC] jacks (MG16/4: CHs 1 to 8, 9/10, 11/12.
MG12/4: CHs 1 to 4, 5/6, 7/8)
[LINE] jacks (MG16/4: CHs 1 to 8. MG12/4: CHs
1 to 4)
w[INSERT I/O] Jacks
(MG16/4: CHs 1 to 8. MG12/4: CHs 1 to 4)
eChannel Input jacks
Phone type (MG16/4: CHs 9/10 to 15/16. MG12/4:
CHs 5/6 to 11/12)
RCA pin type (MG16/4: CHs 13/14, 15/16. MG12/
4: CHs 9/10, 11/12)
r[GROUP OUT] (1, 2) Jacks
t[ST OUT] (L, R) Jacks
y[C-R OUT] Jacks
u[SEND] Jacks
i[RETURN L] (MONO), [RETURN R] Jacks
o[REC OUT]...](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-9.png "Page 10
10 MG12/4
MG16/4
qChannel Input jacks
[MIC] jacks (MG16/4: CHs 1 to 8, 9/10, 11/12.
MG12/4: CHs 1 to 4, 5/6, 7/8)
[LINE] jacks (MG16/4: CHs 1 to 8. MG12/4: CHs
1 to 4)
w[INSERT I/O] Jacks
(MG16/4: CHs 1 to 8. MG12/4: CHs 1 to 4)
eChannel Input jacks
Phone type (MG16/4: CHs 9/10 to 15/16. MG12/4:
CHs 5/6 to 11/12)
RCA pin type (MG16/4: CHs 13/14, 15/16. MG12/
4: CHs 9/10, 11/12)
r[GROUP OUT] (1, 2) Jacks
t[ST OUT] (L, R) Jacks
y[C-R OUT] Jacks
u[SEND] Jacks
i[RETURN L] (MONO), [RETURN R] Jacks
o[REC OUT]...")
10 MG12/4 MG16/4 qChannel Input jacks [MIC] jacks (MG16/4: CHs 1 to 8, 9/10, 11/12. MG12/4: CHs 1 to 4, 5/6, 7/8) [LINE] jacks (MG16/4: CHs 1 to 8. MG12/4: CHs 1 to 4) w[INSERT I/O] Jacks (MG16/4: CHs 1 to 8. MG12/4: CHs 1 to 4) eChannel Input jacks Phone type (MG16/4: CHs 9/10 to 15/16. MG12/4: CHs 5/6 to 11/12) RCA pin type (MG16/4: CHs 13/14, 15/16. MG12/ 4: CHs 9/10, 11/12) r[GROUP OUT] (1, 2) Jacks t[ST OUT] (L, R) Jacks y[C-R OUT] Jacks u[SEND] Jacks i[RETURN L] (MONO), [RETURN R] Jacks o[REC OUT]...