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