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MHC-V71/V71D
25
SECTION 5
TROUBLESHOOTING
SMPS Board Diagnosis Flow
AC
IN
Yes
No
Check whether the state of the Cable and Outlet
are normal.
If there are no problems, check circumference
circuit for
Main ON on Output of the Motherboard mount
side.
The P
ow
er
cont
rol
si
gna
l to SMPS board is checked.
Is following powe
r voltage OK?
(5) CN6500 connect
or
Pin 1 : PGND Pin 3 : PGND Pin 4 : PGND Pin 5 : PGND Pin 6 : PVDD
(DC+
58.5V)
Pin 7 : PVDD
(DC+
58.5V)
Pin 8 : PVDD
(DC+
58.5V)
Pin 9 : PVDD
(DC+
58.5V)
(1) AC input (2) Fuse (3) MAIN power transformer (4) NO6501 connect
or
Pin 1 : Audio (+17V) Pin 3 : Audio (GND) Pin 4 : LED (+17V) Pin 5 : LED (+17V) Pin 6 : LED (GND) Pin 7 : LED (GND) Pin 8 : AC DET Pin 9 : Main ON Pin 10: Network ON Pin 11: Latch ON
Main ON
Standby
Demo mode
Power On
NO6501:pin9
Low (0V)
Hi (3.3V)
Hi (3.3V)
The Output from
SMPS board is checked.
Is following power voltag
e up to standard?
No
Replaces SMPS board if it is not up to standard.
Standby
Demo mode
Power On
pin 1,4,5
NO6501
pin 6,7,8,9
CN6500
17.4±5V
17.4±5V
58.5±5V
58.5±5V
17.4±5V 58.5±5V
Yes
END
(1)
(3)
(5)
(4)
(2)
SYS SET
2018/05/30 01:52:46 (GMT+09:00)