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BD 300 (serv.man2) - JBL Audio Service Manual (repair manual). Page 9

Read JBL BD 300 (serv.man2) Service Manual 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
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