DOWNLOAD JBL BD 300 (serv.man2) Service Manual ↓ Size: 4.11 MB | Pages: 42 in PDF or view online for FREE

Model
BD 300 (serv.man2)
Pages
42
Size
4.11 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
bd-300-sm2.pdf
Date
PREV: JBL BD 300 Service Manual

JBL BD 300 (serv.man2) Service Manual ▷ View online

 
 
 
No display on VFD, and buttons do not work 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                               
 
 
 
 
 
 
                                                                                     
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
No 
No 
Yes 
Yes 
No display on VFD, and 
buttons do not work 
Check every supply 
voltage on main board is 
normal 
 
Check the connect line is OK 
 
Correct connection   
Replace U135 or VFD 
Yes 
NO 
No 
Check the front board 
signals VSTB ,VCLK,VD,   
(XP13:pin8,9,10) 
1.Check the VFD board 
whether bad solder exists on 
U135 and pins of VFD,   
2.Check whether the circuit 
connected to 
K135,K136,,K138,K151, S608 
are broken.
 
 
 
 
Check Q207, Q208, 
Q209,U1,U2,U3,U1
5 is fixed on the 
Fix it 
Yes 
 
Trouble shooting chart
5- 1 
JBL
SB 300 Service Manual
Page 8 of 41
 
 
 
No audio output 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
refer to <
NO +32V 
output
> 
Check 32v(BD100 is 20V) 
voltage on AMP board is 
normal 
Check the signals of I2S 
(XP11 Pin 1,2,3,4,5,7)
 
Check the connect line is OK 
Yes 
No audio output 
Trouble shooting chart
Yes 
NO 
NO 
Check  U801’s output(U801 
pin4,8,12,) is right,    check the 
signal of Valid    (R774 )is high
Yes 
Check U7 is output 
is,C12,A12,B12,C11,D11,D12, 
 
NO
Yes 
Check AMP IC 
U710/U711/U712 is right
 
Replace U710/U711/U712 
NO
Replace the speaker
 
5- 2
JBL
SB 300 Service Manual
Page 9 of 41
 
 
 
 
 
Remote control does not work 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                             
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                   
 
 
 
 
 
Go 
Yes 
Yes 
Yes  
Remote control 
does not work 
NO 
Replace the battery for remote 
controller  
Check whether the remote 
controller’s battery is 
exhausted  or not.
 
Check the IR601 is right 
output 
Check the connect line is OK 
No 
Trouble shooting chart
Replace IR601
 
5- 3
JBL
SB 300 Service Manual
Page 10 of 41
 
 
 
 
Can’t read disc or can’t open the disk door
 
 
 
 
 
 
                                                         
 
 
 
 
 
 
 
 
 
 
 
 
 
       
 
 
 
 
 
 
 
 
 
 
     
 
 
I 
 
 
 
 
 
 
 
 
 
 
Yes 
Check the connection 4pin cable from the 
main board
 
Can’t read disc or can’t 
open the disk door 
Check 45pin and 8pin 
 
cable from main board 
connection to the loader is 
normal  
Replace the loader
NO 
GO 
 
Check whether the 
DVD loader running is 
normal
 
Fix the connection the 45pin cable or
8pin cable. 
NO
Yes 
Trouble shooting chart
Check if U11 (pin2) voltage 
is normal (about 9V) 
Fix R946/R947 or check 
U11 (pin3) 
voltage is OK (about 12V)
 
NO
Check R203/R205 are normal 
(the voltage between two 
resistance is 1.5V 
Yes 
Fix  or Replace R203/R205 
Yes 
5- 4
JBL
SB 300 Service Manual
Page 11 of 41
Page of 42
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