Yamaha STAGEPAS 300 Service Manual page 28

STAGEPAS 300
QQ
3 7 63 1515 0
< Power LED >
< Signal Path >
< FAN >
K
Base = 0.6 V (DC)
Q808:ON
TE
Replace the Power Amplifier Unit.
L 13942296513
Check
R910,R863,R911,R864,R865,R868
R874,R869,R870,R900,R871,R875
Q824,Q809,Q810,Q811,Q808,Q817
C847
Replace the POWER circuit board.
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Connect the circuit boards(INPUT,FILTER,VR)and two fans.
I
Power LED = ON
CN9:
No
2 pin(4 pin)
OUTPUT OK
Q808:OFF
Q808:
No
?
Yes
2
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2 9
8
1
Q822:ON
No
?
Remove the Power Amplifier Unit.
Yes
J
No
Power LED = ON
?
Yes
Replace the Power Amplifier Unit.
Q Q
3 6 7 1 3 1 5
Q817:ON
No
Check
R908,R913,R909,R892,R893
R894,R895,Q819,Q818,Q820
Q821,Q822,C912,C913
Check
R867,R872,R905,R906,R907
R888,R889,Q823,Q814,Q815
Q816,C999,C845,D826,D828
co
.
9 4 2 8
?
Yes
0 5 8 2 9 9 4 2 8
L
Q817:
Base = 0 V
?
Q817:OFF
Yes
m
9 9
9 9