JBL ES 250PW (serv.man2) Service Manual ▷ View online
Sweep Function
1) Follow steps 9-14 above, using a sweep generator as a signal source.
2) Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or
any other noises. If any unusual noises are heard, remove woofer and test.
Driver Function
1) Remove woofer from cabinet; detach + and - wire clips.
2) Check DC resistance of woofer; it should be 3.6 ohms ±10%
3) Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier
fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V.
4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
ES250PW
12
-15V
GND
GND
GND
+15V
mute
mute
+15V
-15V
Power regulator
circuit
circuit
Class_d
Amp model
Amp model
Relay
To speaker
protection
12.288MHz
Crossover
control
U102
control
U102
signal input
Ac in
signal input
protection
Power amp PCB
Wireless PCB
Pre amp PCB
ES250PW
13
ES250PW Testing Flow Chart
yes
no
no
yes
yes
no
yes
no
yes
no
yes
no
yes
no
yes
no
no
yes
yes
no
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
Transmitter
Troubleshooting Flow Chart
no
yes
yes
yes
no
yes
yes
no
yes
red
LED light green
yes
no
yes
yes
no
yes
AMP no signal out
check +VD(17VDC)
Check+VA(15VDC)
Check+12VDC +3.6VDC
Check,D1,L01,D05,Q04,D0
3,Q03,Q01,Q02 etc
OK, END
Check MD01WH4924
Check Q06,Q05 etc
Check,Q07,D08 .U01,D10,U02etc
LED light green or red
Check,U05,U06,U08,Q11
,Q12,U03,U04 etc
Check LAUNCHER
signal
Check MD01 AINL,AINR
signal
CheckU07,U05,U06 etc
ES250PW
15
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