Yamaha Stagepas 300 Service Manual page 27

• Trouble Shooting (POWER circuit board)
[ No Load ]
< Fuse :Primary >
< Power Supply :+VB >
< Power Supply :-VB >
< Power Supply :+15 V >
< Power Supply :+5 V >
< Power Supply :-15 V >
[ With Load ]
< Lch :VDR1 >
< Rch :VDR2 >
START
A
F1 (Fuse)
OPEN ?
No
B
CN4: 7 pin
+VB = +38 V (DC)
?
Yes
C
CN4: 5 pin
-VB = -38 V (DC)
?
Yes
D
CN19: 7 pin
+15 V (DC) ?
Yes
E
CN19: 6 pin
+5 V (DC) ?
Yes
F
CN19: 8 pin
-15 V (DC) ?
Yes
Connect the Power Amplifier Units. (AAX62070)
パワーアンプユニット（AAX62070）を接続
G
CN4: 3 pin
VDR= -28 V (DC)
?
Yes
H
CN6: 3 pin
VDR= -28 V (DC)
?
Yes
1
Yes
No
No
Check
IC801,D804,D830
No
and peripheral
IC801,D804,D830
及び周辺の確認
Check
No
IC805 and peripheral
IC805及び周辺の確認
Check
IC803,D829,D814
No
and peripheral
IC803,D829,D814
及び周辺の確認
Check
Q806,D824,R847,R851
No
Q806,D824,R847,R851
の確認
Check
Q807,D825,R848,R856
No
Q807,D825,R848,R856
の確認
STAGEPAS 300
2
27