BDT 30MKII BK - Harman Kardon Audio Service Manual (repair manual). Page 12

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No display on VFD, and buttons do not work 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                               
 
 
 
 
 
 
 
                                                                                     
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
No 
No 
Yes 
No display on VFD, and 
buttons do not work 
Check every supply 
voltage on main board is 
normal 
Refer to Power supply board part
 
 
Check if the U2 is  on the front 
board 
 
Correct connection   
Replace   VFD 
Yes 
Yes 
Yes 
No 
Check the front board 
signals SCLK,SDA, STB 
(Pin 10，11，12of the XP1) 
 1: check the reset circuit for 
R60,C14,D1. 
 
 
 
 
 
Trouble shooting chart
5-1 
Harman Kardon
BDT 30MKII BK Service Manual
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