Yamaha STAGEPAS 500 Service Manual page 33

< Signal Path >
< FAN > < Power LED >
Connect the circuit boards("CONTROL1 (1/3)", "DSP", "CONTROL2 (2/3):CN542-CN24") and a fan.
"CONTROL1(1/3)シート"、"DSPシート"、"CONTROL2(2/3)シート:CN542-CN24" 及び FAN を接続
K
Q545:
Base = 0.6 V (DC)
?
( Q545: ON )
Yes
< AMP:Operate Mode>
Replace the AMP circuit boards.
AMPシートの交換
Check
R564–566, 568,569,572,573
R580–583, 598
Q541–545, 548
C561
R564∼566,568,569,572,573
R580∼583,598
Q541∼545,548
C561 の確認
2
Replace the POWER circuit board.
POWERシートの交換
1
Power LED=BLINKING
[点滅]
?
No
I
Power LED = ON
[点灯]
?
Yes
( Q549: OFF )
No
CN544: 11 pin
(CN546: 11 pin)
OUTPUT OK
?
Yes
( Q545: OFF )
No
END
Yes
POWER switch: OFF
No
Power LED=BLINKING
[点滅]
?
( Q549: ON )
No
Yes
Remove the AMP circuit boards.
AMPシートを外す
J
No
Power LED = ON
[点灯]
?
Yes
Replace the AMP circuit boards.
AMPシートの交換
Q548: ON
Q548:
No
Base = 0 V
?
Yes
Check
R577–579, 584–587
Q550–553
C563, 564
R577∼579, 584∼587
Q550∼553
C563,564 の確認
Check
R563,567,570,571,574–576, 535
Q546,547,558,559
C559,562,
D541,542
R563,567,570,571,574∼576,535
Q546,547,558,559
C559,562,
D541,542 の確認
STAGEPAS 500
ON
L
Q548:OFF
33