Read Harman Kardon BDT 20 - BDT 2 Service Manual online
No display on VFD, and buttons do not work
No
No
No
Yes
Yes
No disp lay on VF D, and
buttons do not work
buttons do not work
Check ever y suppl y
voltage on main board is
voltage on main board is
normal
Refer to Power supply board part
Check the U721’s pin 61,60,59singal
Correct connection
Replace U721
Yes
Yes
Yes
No
Check38V,5V,+12V
voltage on th e po wer
and front board
voltage on th e po wer
and front board
Check th e front bo ard
signal VDIN,VCLK,
signal VDIN,VCLK,
VSTB，
1.Check whether bad solder exists
on U721 and pins of VFD,
2.Check w hether the circuit
connected to K7, K2, K3, K4, K5,
K6 is broken.
on U721 and pins of VFD,
2.Check w hether the circuit
connected to K7, K2, K3, K4, K5,
K6 is broken.
Fix the c onnection XS603 on front
board and ZD602
board and ZD602
Trouble shooting chart
5-1
harman/kardon
BDT 2 / BDT 20 Service Manual
Page 9 of 37
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