Yamaha Mg12.4 Service Manual
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Page 41
41 MG12/4 MG16/4 2-7. Frequency Characteristics In the signal routes of the Table 2-6-1 to 2-6-6 indicated with q to !0 , the 20Hz and 20kHz frequency response of each output shall be within the range of 0 dB +1/-2.5 dB compared to the 1kHz (0dB). * The 20Hz level when the GAIN volume is Max shall be within the range of 0 dB +1.0/-4.5 dB compared to the 1kHz (0dB). * In the route q, check every OUT when the signal is fed to CH1, and check only the ST L OUT when the signal is fed to CH2 and other...
Page 42
42 MG12/4 MG16/4 2-12. Meter LED lighting check PEAK LED lights up, when ST output level reaches +17.5 +/- 2dBu. 0 LED lights up, when ST output level reaches +4 +/- 2dBu. Operate the fader and check that LED light up in order from “-20” to “PEAK”. 2-13. Distortion Factor In the signal routes of the Table 2-6-1 to 2-6-6 indicated with q to !0 (except e r), set the VR and Fader of INPUT and and MASTER to the Nominal Position, and set the GAIN to the position specified in the Table (except PHONES). Then,...
Page 43
![Page 43
43 MG12/4
MG16/4
2-17 PHANTOM
Connect a 10kΩ load resistance between the pin 1 and 2 of the MIC and short-circuit between the pin 2 and 3.
Turn on the PHANTOM switch(LED shall light) and the voltage between pin 1 and 2 shall be within +35 +/- 3V. Table 2-16-1 [dBu ]
Fader/VR STEREO OUT GROUP OUT AUX OUT C-R OUT
MAX -78.0 -80.0 -75.0 -72.0
MIN -100.0 -100.0 -100.0 -87.0
2-15. Equivalent Input Noise
In the state 2-2, connect between the CH INPUT MIC terminals (2pin-Hot and 3pin-Cold) with 150 ohms, the...](http://img.usermanuals.tech/thumb/83/104158/w300_d_1519721431-yamaha-mg12-4-service-manual_d-42.png "Page 43
43 MG12/4
MG16/4
2-17 PHANTOM
Connect a 10kΩ load resistance between the pin 1 and 2 of the MIC and short-circuit between the pin 2 and 3.
Turn on the PHANTOM switch(LED shall light) and the voltage between pin 1 and 2 shall be within +35 +/- 3V. Table 2-16-1 [dBu ]
Fader/VR STEREO OUT GROUP OUT AUX OUT C-R OUT
MAX -78.0 -80.0 -75.0 -72.0
MIN -100.0 -100.0 -100.0 -87.0
2-15. Equivalent Input Noise
In the state 2-2, connect between the CH INPUT MIC terminals (2pin-Hot and 3pin-Cold) with 150 ohms, the...")
43 MG12/4 MG16/4 2-17 PHANTOM Connect a 10kΩ load resistance between the pin 1 and 2 of the MIC and short-circuit between the pin 2 and 3. Turn on the PHANTOM switch(LED shall light) and the voltage between pin 1 and 2 shall be within +35 +/- 3V. Table 2-16-1 [dBu ] Fader/VR STEREO OUT GROUP OUT AUX OUT C-R OUT MAX -78.0 -80.0 -75.0 -72.0 MIN -100.0 -100.0 -100.0 -87.0 2-15. Equivalent Input Noise In the state 2-2, connect between the CH INPUT MIC terminals (2pin-Hot and 3pin-Cold) with 150 ohms, the...
Page 44
44 MG12/4
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47 MG12/4 MG16/4
Page 48
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Page 49
WARNINGComponents having special characteristics are marked and must be replaced with parts having specification equal to those originally installed. Notes : DESTINATION ABBREVIATIONS The numbers “QTY” show quantities for each unit. The parts with “--” in “PART NO.” are not available as spare parts. This mark “ } ” in the REMARKS column means these parts are interchangeable. The second letter of the shaded ( ) part number is O, not zero. The second letter of the shaded ( ) part number is I, not...
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MG12/4 2 210 450 450430 460 280270260250 250 360 310 430 440 430460460 460460430 430 15 30 30 30 15 120 440 480 140 500500 510 510130 510 420 150 400 10 180 20 70 40a 50 60 40 350520 520 320 320 320 320 250 220230 100320110 310 170 450 40b JACK 1/2 JACK 2/2 430 430 300 Rear view Reflector meter