JBL ES250PW - ES250 PW Testing Flow Chart

ES250PW Testing Flow Chart
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Start
Dc voltage check
±Vcc,±15V
OK
Check transformer
C
168,C169,D123,
D
124,C170
Power on check
LED red &green
OK
Check vol module
& connector
cable& ±15V.etc
Check THD output
power, noise
OK
Check pre board
& power board ,
±Vcc,±15V ect
Test frequency
Response
OK
Check U102,uR133,
C
121,R135,C122.ect
Test input sensitivity
OK
Check U101,R117,
R
112,R114 etc
Test protection
OK
Check U107.R237
±15Vcc etc
Test limiter circuit
OK
Check U106.Q107ect
Auto off Function
Hi pot test
OK
Check U103.Q101.
Q102.C131.R142;AC
cord, Transformer.
OK
Listening test
OK
The Amp ass’y ok
END
Test frequency
Response
Check U105
C137C137CC143ect
ES250PW
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