53
1-8 No sound input/output from USB
Symptom: Audio is not input/output :
Diagnostic procedure:
1.Connect PC with USB cable.
2.Is there clock 6MHz to ground IC901->PIN51&50 If it is not, IC901
、
X900 is damaged.
3.Is a signal input to the USB D+ & D- ? IC901 USB IN->PIN7& PIN8 , as figure 1-8
4.If it is not, IC901 is damaged.
1-9 No sound output from MASTER OUT
Symptom: Audio is not output & MASTER level meter is not light up :
Diagnostic procedure:
1.Is a signal output to the DAC? U755:MASTER->PIN15&PIN18
A. If it is, something is wrong with the analog -circuit block. Check if output amplifier (U515:MASTER) is
working normally. Check if each MUTE transistor (Q512~513) BASE PIN is -12V.
B. If it is not, something is wrong with the digital-circuit block. Check if there is CLOCK signal for
U755 :MASTER->PIN1 & PIN2 & PIN3 & PIN4 , as figure 1-9.
1-10 No sound output from BOOTH
Symptom: Audio is not output :
Diagnostic procedure:
1. Is a signal output to the DAC? U756:BOOTH->PIN15 & PIN18
A. If it is, something is wrong with the analog -circuit block. Check if output amplifier (U510)
is working normally. Check if each MUTE transistor (Q526~Q529) BASE PIN is -12V.
B. If it is not, something is wrong with the digital-circuit block. Check if there is CLOCK signal for
U756:BOOTH ->PIN1 & PIN2 & PIN3 & PIN4, as figure 1-9.
1-9 U755 PIN 2
1-9 U755 PIN 1
1-8 IC901 PIN7& PIN8
1-9 U755 PIN 4
1-9 U755 PIN 3
Содержание MC6000MK2EM
Страница 8: ...Personal notes 8 ...
Страница 22: ...22 23 Remove the screw 4 LED lens 2 screw 4 ...
Страница 36: ...36 5 Click the Next 6 Click the Next 7 The Setup Status bar appears ...
Страница 39: ...39 7 The Setup Status bar appears 8 Click the OK MC6000MK2 MC3000 MC6000MK2 MC6000MK2 ...
Страница 69: ...69 PACKING VIEW Refer to the last chapter for the part list z z z z z ...
Страница 71: ...71 IC Block Diagram 417 RMP3 936 IC PIC16F616 I SL SOIC 16 ...
Страница 72: ...72 IC Block Diagram 417 IQ2UM 940 IC PCM1803ADB SSOP 20 417 IQ2UM 1004 IC BD12KA5FP TO252 3 ...
Страница 73: ...73 IC Block Diagram 417 EN2000 1039 IC STM8S207MBT6B LQFP 80 ...
Страница 74: ...74 IC Block Diagram 417 PDJ33 1045 IC SOP8 TPS54232 ...
Страница 75: ...75 417 IQ2UM 941 IC DSP56724 LQFP 44 IC Block Diagram ...
Страница 77: ...77 417 DDJLE 1084 IC EN25F1 100GIPTR IC Block Diagram ...
Страница 78: ...78 IC Block Diagram Vref VOUT VCC GND 417 HDJ2000 503 BD4745G 417 M5 582 NJM2068M ...
Страница 80: ...80 Ic Block Diagram 417 COMBO 1091 IC BU33TD3WG TR 55 417 6K2 1141 IC 74HCT595 ...
Страница 83: ...83 Personal notes ...