NAD T748 Service Manual page 73

* T748 DISPLAY PART TROUBLESHOOTING
NO LED LIGHT UP
IS THE POWER
CORD
CONNECTED?
O K
CHECK AT
CN501 PIN15
"H"
O K
CHECK & REPLACE CHECK & REPLACE
LED(D5032) or LED(D5032) or
Q5031 Q5032 Q5033 Q5031,Q5032,Q5033,
Q5036,Q5037
N O
PLUG THE POWER
CORD INTO THE
WALL OUTLET
SECURELY
. N G
CHECK POWER
SUPPLY CIRCUIT
CHECK HOST
MCU(IC101) PART
NO DISPLAY ON VFD
CHECK AT
CN502 PIN1,
PIN3, PIN5
O K
CHECK AT
FIP51 PIN1~2,
58, 61~62
O K
CHECK & REPLACE VFD CHECK & REPLACE VFD
2-88
N O
CHECK POWER
SUPPLY CIRCUIT
. N G
CHECK OPEN
CIRCUIT or SHORT
CIRCUIT