BenQ PB6200 - Manual (Page 76)

76
Smaller boards
Keypad
function
1.chk U1 voltage source(5V)
2.chk U1 output signal (always 5V dc in regular tim e,no pulse voltage)
Yes
Y es
No
No
No
Rear Front IR
function
FAN /B D
Fan control:
1.chk the voltage of Q F1 (5,6,7,8)
2.chk the fan voltage U502(2,15),U503(8)
3.check Y 501(32.768kHz)
N o 5V
1.C heck Q 701 & therm al B reaker
LED dark
1.chk LE D voltage from J1
2.chk the m ounting direction of LE Ds
No work
1.chk buttons contact to P CB
PFC BOARD