5-2 Trouble shooting Chart
Touch keys do not work
keys do not work
Go
No
Fix the connection CON606 to CON607
on Front Board
Yes
Replace U8 on Main Board, or
replace Main Board
No
Yes
Replace U604 on Touch Board
Check voltage 3.3V and 12V on Touch
Board:
3.3V at R676
12V at R680
Check Front Control Board signals at XP9
Pin1 SCL_MCU, Pin2 SDA_MCU
Summary of Contents for HTB5540D/94
Page 13: ...3 4 5 1x 2 3 ...
Page 21: ...X AUDIO IN 2 1 1 3 5MM STEREO 3 USB 2 2 11 ...
Page 22: ...X 1 LAN LAN 1 2 3 2 12 ...
Page 46: ...7 8 7 8 Touch Board Print layout bottom side ...
Page 47: ...7 9 7 9 Touch Board Print layout top side ...
Page 48: ...7 10 7 10 Front Control Board Print layout bottom side ...
Page 49: ...7 11 7 11 Front Control Board Print layout top side ...
Page 50: ...7 12 7 12 Power Board Print layout ...
Page 51: ...7 13 7 13 Amplifier Board Print layout bottom side ...
Page 52: ...7 14 7 14 Amplifier Board Print layout top side ...
Page 57: ...10 1 10 1 Exploded View for HTB5540D 12 94 93 ...