DOWNLOAD Harman Kardon BDS 235 Service Manual ↓ Size: 8.77 MB | Pages: 63 in PDF or view online for FREE

The following check should be performed for the continued
protection of the customer and service technician.

Measure leakage current to a known earth ground (water
pipe, conduit, etc.) by connecting a leakage current tester
between the earth ground and all exposed metal parts of the
appliance (input/output terminals, screwheads, metal
overlays, control shaft, etc.). Plug the AC line cord of the
appliance directly into a 120V AC 60Hz outlet and turn the
AC power switch on. Any current measured must not exceed
o.5mA.

Device

under

test

Test all
exposed metal
surfaces

Also test with
plug reversed
(Using AC adapter
plug as required)

Leakage
current
tester

Reading should
not be above
0.5mA

Earth
ground

3-3

4

 USB Upgrade:

Preparation: 

(1)  USB Storage device 

(2)  Upgrade Binary file (Download from official website) 

USB upgrade steps: 

(1)  Create a folder in USB storage device like “/UPG/”. 

(2)  Extract the Upgrade Binary file into “/UPG/”.   

(3)  Make sure that the path of Upgrade Binary is “/UPG/HK_BDS235.bin”. 

(4)  Plug in your USB Storage device into any USB port on BDS. 

(5)  Use HDMI cable to connect TV and “Monitor out” on your BDS. 

(6)  Boot up your BDS. 

(7)  Select the “Settings” on the home page by using the remote control.   

(8)  Select USB Upgrade in the following order: 

“System”  “System Upgrade”  “USB”. 

(9)  Wait until BDS find the upgrade file in your USB Storage device, then select “OK” to start upgrading. 

(10) Wait for upgrade procedure completion, then BDS will restart automatically. 

 Network Upgrade:

Preparation: 

Wi‐Fi or Ethernet 

Network upgrade steps: 

(1)  Connect the Ethernet cable to BDS.(Optional) 

(2)  Boot up your BDS. 

(3)  Select the “Settings” on the home page by using the remote control.   

(4)  Select “Network” to configure the network of BDS and make sure that your network is connected to the 

Internet. 

(5)  Select Network Upgrade in the following order: 

“System”  “System Upgrade”  “Internet”. 

(6)  Wait until BDS find the upgrade file in the server, then select “OK” to start upgrading. 

(7)  Wait for upgrade procedure completion, then BDS will restart automatically. 

5-1    

  Trouble shooting Chart 

power on led doesn't work 

GO 

Switch performance 
check 

OK 

Check the cable XP810 is 

connect well to Main board 

XP15

 

change switch

 

NG

Reconnect the cable

NG

Refer to Power supply board part

 

NG

Check+34V,+12V,VCC_D  

voltage on the power and 

Main board

 

OK 

OK 

Replace the LED610, 

LED617---LED619

 

Check the power on led 

control circuit is OK

 

Replace the FV Board

NG

OK 

5-2                             Trouble shooting Chart 

 

 

 

No display on VFD   

Go 

Check every supply 
voltage on Main board is 
normal 

Yes 

Check+34V,+12V,VCC_
D voltage on the power 
and Main board and 38V 
on FV Board

Refer to Power supply board part

 

No

Fix the connection XP607 on Main board   

and  CON501 on power board, and 

30pin FFC cable from FV to Main board

 

No

Check the U702 pin 31,32,34 arrive the 

condition XP15 pin 25,24,23 

No

Yes 

Yes 

Check the front board 

signals VFD_DA, 

VFD_CLK, VFD_STB 

1.Check whether bad 
solder exists on  pins of 
VFD,  

 

Correct connection   

No

Yes 

Replace VFD or FV board