Read JBL ES 250PW (serv.man2) Service Manual online
ES250PW Testing Flow Chart
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Start
Dc voltage check
±Vcc,±15V
OK
Check transformer
C
168,
C
169
,D
123
,
D
124,
C
170
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 U
102
,uR
133
,
C
121,
R
135
,C
122
.ect
Test input sensitivity
OK
Check U
101
,R
117,
R
112,
R
114
etc
Test protection
OK
Check U
107
.R
237
±15Vcc etc
Test limiter circuit
OK
Check U
106
.Q
107
ect
Auto off Function
Hi pot test
OK
Check U
103
.Q
101.
Q
102
.C
131.
R
142
;AC
cord, Transformer.
OK
Listening test
OK
The Amp ass’y ok
END
Test frequency
Response
Check U105
C137C137CC143ect
ES250PW
14
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