Yamaha Stagepas 300 Service Manual page 28

STAGEPAS 300
< Power LED >
< Signal Path >
< FAN >
K
Q808:ON
Replace the Power Amplifier Unit.
パワーアンプユニットの交換
Check
R910,R863,R911,R864,R865,R868
R874,R869,R870,R900,R871,R875
Q824,Q809,Q810,Q811,Q808,Q817
C847
R910,R863,R911,R864,R865,R868
R874,R869,R870,R900,R871,R875
Q824,Q809,Q810,Q811,Q808,Q817
C847の確認
Replace the POWER circuit board.
POWERシートの交換
28
Connect the circuit boards(INPUT,FILTER,VR)and two fans.
INPUTシート、FILTERシート、VRシート及びFANを接続
I
No
Q808:OFF
Q808:
No
Base = 0.6 V (DC)
?
Yes
2
1
Q822:ON
No
Power LED = ON
?
Yes
CN9: J
2 pin(4 pin)
OUTPUT OK
?
Yes
Q817:ON
END
Remove the Power Amplifier Unit.
パワーアンプユニットを外す
No
Power LED = ON
?
Yes
Replace the Power Amplifier Unit.
パワーアンプユニットの交換
L
Q817:
No
Base = 0 V
?
Q817:OFF
Yes
Check
R908,R913,R909,R892,R893
R894,R895,Q819,Q818,Q820
Q821,Q822,C912,C913
R908,R913,R909,R892,R893
R894,R895,Q819,Q818,Q820
Q821,Q822,C912,C913 の確認
Check
R867,R872,R905,R906,R907
R888,R889,Q823,Q814,Q815
Q816,C999,C845,D826,D828
R867,R872,R905,R906,R907
R888,R889,Q823,Q814,Q815
Q816,C999,C845,D826,D828
の確認