Yamaha GF12-12, GF16-12, GF24-12 Mixer Schematics 电路图.pdf

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1、SERVICE MANUAL PA 011442 1.92K-2651 Printed in Japan 99.03 HAMAMATSU, JAPAN CONTENTS SPECIFICATIONS. 3/4 PANEL LAYOUT. 5 DIMENSIONS. 8 BLOCK ESSENTIALS OF ORDER ON THE COLLECTION OF BATTERIES. Please refer to the diassembly procedure for the removal of Back-up Battery. Leest u voor het verwijderen v

2、an de backup batterij deze beschrijving. RadioFans.CN 收音机爱 好者资料库 Input terminals Gain trim Actual load impedance For use with nominal Input level Connector Sensitivity1 1. Sensitivity is the lowest level that will produce an output of +4 dB (1.23 V) or the nominal output level when the unit is set a

3、t maximum gain. (All faders and level controls are at maximum positions.) NominalMax. before clip INPUT A, B (120, 112, 18) MAX 3 kohm50600 ohm Mics 86 dB (38.8 V)60 dB (0.775 mV)40 dB (7.75 mV) A: XLR-3-31 type2 B: Phone jack2 2. Balanced. MIN42 dB (6.16 mV)16 dB (123 mV)+4 dB (1.23 V) ST INPUT A,

4、B (2124, 1316, 912) MAX 10 kohm600 ohm Lines 60 dB (0.775 mV)34 dB (15.5 mV)14 dB (155 mV) A: Phone jack3 B: Phone jack3 3. Unbalanced. When dB represents a specifi c voltage, 0 dB is referenced to 0.775 Vrms, 0 dBV is referenced to 1 Vrms. MIN16 dB (123 mV)+10 dB (2.45 V)+30 dB (24.5 V) AUX RTN IN

5、(1, 2)10 kohm600 ohm Lines 12 dB (195 mV)+4 dB (1.23 V)+20 dB (7.75 V)Phone jack3 TAPE IN (L, R)10 kohm600 ohm Lines 26 dBV (50.1 mV)10 dBV (316 mV)+8 dBV (2.51 V)Phone jack3 CH INSERT IN (120, 112, 18) 10 kohm600 ohm Lines 26 dB (38.8 mV)0 dB (775 mV)+20 dB (7.75 V) Phone jack (I/O)3 ST INSERT IN (

6、L, R)10 kohm600 ohm Lines 10 dB (245 mV)0 dB (775 mV)+20 dB (7.75 V) Output terminals Actual source impedance For use with nominal Output level Connector NominalMax. before clip ST OUT (L, R) 600 ohm Lines+4 dB (1.23 V)+24 dB (12.3 V) XLR-3-32 type1 1. Balanced. MONO OUT 600 ohm Lines+4 dB (1.23 V)+

7、24 dB (12.3 V) GROUP OUT (14)600 ohm Lines+4 dB (1.23 V)+20 dB (7.75 V)Phone jack2 2. Unbalanced. When dB represents a specifi c voltage, 0 dB is referenced to 0.775 Vrms, 0 dBV is referenced 1 Vrms. AUX OUT (16)600 ohm Lines+4 dB (1.23 V)+24 dB (12.3 V)Phone jack1 C-R OUT (L, R)600 ohm Lines+4 dB (

8、1.23 V)+20 dB (7.75 V)Phone jack2 REC OUT (L, R)10 kohm Lines10 dBV (316 mV)+10 dBV (3.16 V)Phone jack2 CH INSERT OUT (120, 112, 18) 10 kohm Lines0 dB (775 mV)+20 dB (7.75 V) Phone jack (I/O)2 ST INSERT OUT (L, R)10 kohm Lines0 dB (775 mV)+20 dB (7.75 V) PHONES OUT40 ohm Phones3 mW100 mWST phone jac

9、k2 150 ohm 150 ohm 75 ohm 150 ohm 75 ohm 600 ohm 600 ohm 600 ohm 100 ohm 3 GF24/12 GF16/12 GF12/12 SPECIFICATIONS General specifications Input specifications Output specifications 0 dB is referenced to 0.775 Vrms. Frequency response 20 Hz20 kHz +1 dB, 2 dB +4 dB into 600 ohm (GROUP OUT, AUX OUT, ST

10、OUT, MONO OUT) Input gain control: minimum Total harmonic distortion Less than 0.1 %, 20 Hz20 kHz, +14 dB into 600 ohm (GROUP OUT, AUX OUT, ST OUT, MONO OUT) Hum 12; 20) PAD switch: GAIN trim: HPF switch: EQ (HIGH, MID, LOW) gain control: EQ (MID) FREQ control: AUX 1 to 6 LEVEL control: AUX 3/4,5/6

11、PRE switch: PAN control: ON switch: Fader: PFL switch: Stereo input (9-16; 21-24) A/B switch: GAIN trim: HPF switch: EQ (HIGH, MID, LOW) gain control: AUX 1 to 6 LEVEL control: AUX 3/4, 5/6 PRE switch: BAL control: ON switch: Fader: PFL switch: MASTER GROUP (1-4) PAN control: TO ST switch: Fader: AF

12、L switch: AUX (1-6) Fader: AFL switch: 40 ohm OFF Maximum OFF Center Minimum Maximum ON during measurement only, OFF at all other times. Center ON during measurement only, OFF at all other times. Maximum OFF OFF (A) Maximum OFF Center Maximum ON during measurement only, OFF at all other times. Cente

13、r ON during measurement only, OFF at all other times. Maximum OFF Center ON during measurement only, OFF at all other times. Maximum ON during measurement only, OFF at all other times. Maximum ON during measurement only, OFF at all other times. ST Fader: AFL switch: MONO LEVEL control: POST switch:

14、C-R MONITOR TAPE IN switch: LEVEL control: PHONES LEVEL control: AUX RETURN 1 GROUP 1, 2 level control: AUX 1, 2 level control: ST level control: PFL switch: AUX RETURN 2 GROUP 3, 4 level control: AUX 3, 4 level control: ST levels control: PFL switch: TAPE IN ST level control: ON switch: METER SELEC

15、T GROUP 1-4/ST L R, PFL E AFL/TAPE IN L R select switch: PHANTOM PHANTOM switch: Maximum ON during measurement only, OFF at all other times. Maximum ON during measurement only, OFF at all other times. OFF Maximum Maximum during measuring only, minimum at all other times. Maximum during measuring onl

16、y, minimum at all other times. Maximum during measuring only, minimum at all other times. Maximum during measuring only, minimum at all other times. ON during measurement only, OFF at all other times. Maximum during measuring only, minimum at all other times. Maximum during measuring only, minimum a

17、t all other times. Maximum during measuring only, minimum at all other times. ON during measurement only, OFF at all other times. Maximum ON during measurement only, OFF at all other times. ON during measurement only, OFF at all other times. OFF INSPECTIONS 27 GF24/12 GF16/12 GF12/12 2-1 Gain In sta

18、tus 1-1, the output levels should be within the range given in Tables 1 and 11. (For the items marked with an asterisk (*) in the table below, refer to 2-2 Frequency Response.) (For the items marked with two asterisk s (*) in the table below, refer to 2-8 Distortion.) Table 1: Input Terminal INPUT C

19、H TO 6, 12, 20 (Do not put any input into B.) Unit: dBs Input Level GAINPADAUX PRE PANGROUP (1 to 4) OUT AUX (1, 2) OUT AUX (3 to 6) OUT ST (L, R) OUT C-R (L, R) OUT *1 L*, * +14 +/- 2 (GROUP 1, 3) *, * +10 +/- 2 *, * +20 +/- 2 *, * +14 +/- 2 (ST L) *, * 0 +/- 2 OFF R*, * +14 +/- 2 (GROUP 2, 4) -*,

20、* +14 +/- 2 (ST R) - -70MAXOFF ONL-+10 +/- 2- -26MINOFFOFFL* +14 +/- 2 *2 - 0MINONOFFL+14 +/- 2 *2- *1: When a signal is applied to the C-R MONITOR OUT, you should turn the PFL switch ON. *2: Measure only GROUP1. 1) The difference in the levels of the CH INPUTs (1 8; 12; 20) of each output should be

21、 less than 2 dB. 2) The difference in the levels of the GROUP (1 - 4) OUT; AUX (1, 2) OUT; AUX (3 - 6) OUT and ST (L, R) OUT should be less than 2 dB. Table 2: INPUT B (CH INPUT 1 8; 12; 20) (Do not put any input into A.) Unit: dBs InputInput Level GAINPADCH INSERT OUTGROUP 1 OUT CH INPUT-70MAXOFF-1

22、0 +/- 2+14 +/- 2 CH INSERT IN-10MAXOFF-+14 +/- 2 1) The difference in the levels of the CH INPUT (1 8; 12; 20) of each output should be less than 2 dB. 2) The PAN VR should be turned fully counterclockwise. GF24/12 GF16/12 GF12/12 28 Table 3: ST INPUT A L (CH9; 11-13; 15-21; 23) (Do not put any inpu

23、t into CH 10; 12-14; 16-22; 24.) Input Level GAINAUX PRE PANGROUP (1 to 4) OUT AUX (1, 2) OUT AUX (3 to 6) OUT ST (L, R) OUT C-R (L, R) OUT *1 L *(GROUP 1 only) * +14 +/- 2 (GROUP 1, 3) * +13 +/- 2 * +23 +/- 2 * +14 +/- 2 (ST L) * 0 +/- 2 OFF R*(GROUP 2 only) * +14 +/- 2 (GROUP 2, 4) -* +14 +/- 2 (S

24、T R) - -44MAX ONL-+13 +/- 2- L* +14 +/ -2 (GROUP 1) 0MINOFF R+14 +/- 2 (GROUP 2) - *1: Turn on the PFL switch when you measure the C-R OUT. 1) The difference in the levels of the ST INPUT (9; 11-13; 15-21; 23) of each output should be less than 2 dB. 2) The difference in the levels of the GROUP (1-4

25、) OUT; AUX (1, 2) OUT; AUX (3-6) OUT and ST (L, R) OUT should be less than 2 dB. Table 4: Input Terminal ST INPUT A R (CH10; 12-14; 16-22; 24) (Do not put any input into CH9; 11-13; 15-21; 23.) Unit: dBs Input Level C-R (L) OUT -44 1) The difference in the levels of the ST INPUT (10; 12-14; 16-22; 2

26、4) of each output should be less than 2 dB. Table 5: Input Terminal ST INPUT B (CH 9-16; 21-24) Input TerminalInput Level GAINPFL SWC-R L OUT C-R R OUT 9; 11-13; 15-21; 23 10; 12-14; 16-22; 24 -44MAXON - 1) Turn the ST INPUT A/B switch on at ON (B). 2) The difference in the levels of the ST INPUT (9

27、 16; 22 - 24) of each output should be less than 2 dB. Unit: dBs GAINC-R (R) OUT 0+/-2No output ONMAX PFL SW 0 +/- 2 0 +/- 2 - Unit: dBs 29 GF24/12 GF16/12 GF12/12 Table 6: Input Terminal CH1 INPUT Unit: dBs Input Level GAINPOST OFF* , * +10 +/- 2-70MAX ON 1) Turn on the ST assign switch of CH1 INPU

28、T. 2) When the signal is applied to the MONO OUT, set the CH PAN to the center. 3) When the signal is applied to the REC OUT, turn the CH PAN to L (for maximum turn counterclockwise) or R (for maximum turn clockwise). Table 7: Input Terminal CH1 INPUT Unit: dBs Input Level GAINCH1 PAN VR Select Swit

29、ch GROUP TO ST switch GROUP TO ST PANST L OUTST R OUT L+14 +/- 2-LGROUP 1, 3 R-+14 +/- 2 L+14 +/- 2- -80MAX RGROUP 2, 4 R-+14 +/- 2 1) Turn on the GROUP (1-2; 3-4) assign switch of CH1. 2) Turn off the ST assign switch. 3) Turn on one of the TO ST switches in GROUP (1 - 4). Table 8: Input terminal C

30、H1 INPUT, OUTPUT C - R MONITOR L R OUT Input Level GAIN PRE PANAUX (1, 2) AFL ON AUX (3 to 6) AFL ON ST (L, R) AFL ON L+10 +/- 2-80MAX R (C-R R) Unit: dBs +20 +/- 2- * -7.8 +/- 2 MONO OUTREC OUT (L,R) OFF OFF PAD AUXGROUP (1, 3) AFL ON -+6 +/- 2* +10 +/- 2 (C-R L) +16 +/- 2 -+10 +/- 2-* +10 +/- 2 GR

31、OUP (2, 4) AFL ON GF24/12 GF16/12 GF12/12 30 Table 9: Input terminal AUX RETURN InputInput Level GROUP (1, 2) OUT GROUP (3, 4) OUT AUX (1, 2) OUT AUX (3, 4) OUT ST(L, R) OUT C-R (L, R) OUT *1 1L (No plug for 1R) *A * +10 +/- 2 -* +10+/-2 -* +10 +/- 2 * 0 +/- 2 2L (No plug for 2R) -*, * +10 +/- 2 -*

32、+10 +/- 2 * +10 +/- 2 * 0 +/- 2 1R No output GROUP 2 +10 +/- 2 -AUX 1 No output AUX 2 +10 +/- 2 -ST L No output ST R +10 +/- 2 C-R L No output C-R R 0 +/- 2 2R -6 - No output GROUP 4 +10 +/- 2 -AUX 3 No output AUX 4 +10 +/- 2 ST L No output ST R +10 +/- 2 C-R L No output C-R R 0 +/- 2 *1: Turn on th

33、e PFL switch when measuring the C-R OUT. 1) The difference in the level between the following should be less than 2 dB: GROUP (1 to 4) OUT; AUX (1 to 4) OUT; and ST (L,R) OUT. Table 10: Input terminal TAPE IN L R Input Input Level ST L OUT ST R OUT C-R L OUT C-R R OUT PHONES L PHONES R TAPE IN L+20

34、+/- 2 *1 -+10 +/- 2 *2 -*, * -1 +/- 2 *3 - TAPE IN R -7.8 -+20 +/- 2 *1 -+10 +/- 2 *2 *, * -1 +/- 2 *3 *1 Set the TAPE IN ON switch to ON and the TAPE IN VR at maximum. *2 Set the C-R MONITOR LEVEL VR at maximum and the PFL.AFL/TAPE IN switch to ON. *3 Set the PHONES VR at maximum and the PFL.AFL/TA

35、PE IN switch to ON. Table 11: Input Terminal ST INSERT IN Unit: dBs Input Input Level ST L OUTST R OUT ST INSERT L+4 +/- 2 ST INSERT R -10 -+4 +/- 2 1) The level difference between ST (L, R) OUT should be 2 dB or less. 2-2 Frequency Response With the input signal frequency is set to 20 Hz and 20 kHz

36、 in the state as described in 2-15, check the level at each output terminal marked with an asterisk (*) in Table 1, Table 3, Table 6, Table 8, Table 9, and Table 10. It should fall within the range of +1 dB and -2 dB, using 1 kHz as a reference. Unit: dBs GROUP 1 GROUP 3 Unit: dBs - - 31 GF24/12 GF1

37、6/12 GF12/12 2-3 Equalizer Characteristics With each EQ control moved in the state as described in 1-1, check the output level of each frequency obtained at GROUP 1 OUT (GROUP 1, 2 OUT for ST INPUT). It should be within the range shown in Tables 12 and 13 with the output level at the center click po

38、sition of the EQ GAIN control (this should be the reference point). Table 12: CH INPUT (1-8; 12; 20) EQ Unit: dBs EQGAINf-VRInput Signal Frequency Response MaximumHI Minimum -10 kHz Maximum Minimum Minimum Maximum MID Minimum Maximum MaximumLOW Minimum - Table 13: ST INPUT (9 to 12, 13 to 16, 21 to

39、24) EQ Unit: dB EQGAINInput Signal Frequency Response MaximumHI Minimum 10 kHz MaximumMID Minimum 2.5 kHz MaximumLOW Minimum 100 Hz 2-4 HPF Variation Characteristics In status 1-1, if the applied signal is 80 Hz and the HPF switch of the INPUT CH is switched ON, the output level of GROUP OUT 1 shoul

40、d be within -3 +/- 2 dB, using the level when HPF is OFF as the reference. However, when measuring the ST INPUT, check the output level of GROUP 1 OUT for the L input and that of GROUP 2 OUT for the R input. 2-5 Separation With AUX SEND VR of CH1 and AUX 1, 2 fader set to the nominal position, check

41、 that the leakage level of AUX 2 OUT is -50 dB or less when a +20 dB is obtained at AUX 1 OUT. 100 Hz 5 kHz 250 Hz +12 +/- 2 -12 +/- 2 +15 +/- 2.5 -15 +/- 2.5 +15 +/- 2.5 -15 +/- 2.5 +12 +/- 2 -12 +/- 2 +12 +/- 2 -12 +/- 2 +15 +/- 2.5 -15 +/- 2.5 +12 +/- 2 -12 +/- 2 GF24/12 GF16/12 GF12/12 32 With A

42、UX 2 SEND VR of CH1 and AUX 1, 2 fader set to the nominal position, check that the leakage level of AUX 1 OUT is -50 dB or less when a +20 dB is obtained at AUX 2 OUT. Check similarly between AUX 3 and AUX 4, and between AUX 5 and AUX 6. 2-6 PEAK LED Lighting Level Check that PEAK LED lights up at t

43、he input signal level, as specified in Table 14, when a signal is applied to the CH INPUT or the ST CH INPUT in the state as described in 1-1. Table 14: PEAK LED Unit : dBs InputCH INPUT Input Signal Level -43 +/- 2 *1: Perform this check both when inputting a signal to the L CH (insert a blank jack

44、 into R CH) and when inputting a signal to R CH. 2-7 METER LED Lighting Level Check that the METER SELECT switch is turned on, and that each METER LED lights up when the output level of GROUP within the range listed in (1 to 4) is Table 15. Table 15: METER LED Unit : dBs LED NameLighting Start Level

45、 PEAK +8 +5 +3 +1 0 -1 -3 -5 -7 -10 -15 -20 * When the METER SELECT switch is turned off, check that 0 of the ST OUT L R LED lights up when the ST OUT L R level is +4; +/- 2; and 0 and that the PFL AFL/TAPE IN L R LED lights up when the C-R (L, R) OUT level is +10 +/- 2. 2-8 Distortion Set each fade

46、r of the INPUT and MASTER to the Nominal Position in the state of 1.1. Check at each output terminal that the distortion is 0.1% or less when an output or +14 dBs is obtained at 20 Hz, 1 kHz and 20 kHz in the system of marked * in Table 1, Table 3, Table 6, Table 9, and Table 10. Also, when both an

47、output of +3 dBs is obtained at PHONES OUT and an output of + 2.2 dBs is obtained at REC OUT, the distortion factor should be less than 0.1 %. ST CH INPUT *1 -17 +/- 2 +17 +/- 2 +12 +/- 2 +9 +/- 2 +7 +/- 2 +5 +/- 2 +4 +/- 2 +3 +/- 2 +1 +/- 2 -1 +/- 2 -3 +/- 2 -6 +/- 3 -11 +/- 4 -16 +/- 5 33 GF24/12

48、GF16/12 GF12/12 2-9 Maximum Output Level Check that a +24 dBs output is obtained with the distortion factor of 1% or less at AUX (1 - 6) OUT, ST (L, R) OUT and MONO OUT in the state as described in 1-1. Also, check that a +20 dBs output is obtained with the distortion factor of 1% or less at GROUP (1 - 4) OUT and C - R (L, R) OUT, and that a +8 dBs output with the distortion factor of 1% or less is obtained at PHONES (L, R) OUT. 2-10 Noise Level Check the noise level that is obtained at GROUP 1 OUT when only th