HCD-GPX555/GPX888
17
SECTION 5
TROUBLESHOOTING
Switching Regulator Diagnosis Flow
The Output from Switching regulator is checked.
Is following power voltage up to standard?
AC
IN
Ye
s
No
Ye
s
END
No
Checks whether the state of a Cable and Outlet are normal.
If there are no problems, checks circumference circuit for
Main on/Sub on Output of Main mount side.
Replaces Switching regulator if it is not up to standard.
The Power Control signal to Switching regulator is checked.
Is following power voltage OK?
Main on/Sub on
Standby
Demo mode Power On
CN 3 : pin6 Low (0V) Low (0V)
Hi (3.3V)
(1) AC
input
(2) Fuse
(3) Sub Power transformer
(4) CN3 Connector
pin1-2: 13V
pin3-4: GND
pin5: AC-DET
pin6: MAIN-ON
(5) MAIN Power transformer
(6) CN 2 Connector
pin1 : V3+(DC+16-23V)_(ref-V1)
pin2-4 : V1-(DC-61V)
pin5 : V2-(DC-24V)
pin6 : GND
pin7 : V2+(DC+24V)
pin8-10 : V1+(DC+61V)
Standby
D
em
o m
ode
Po
w
er On
CN
3
pin
1
13V
±0.
5V
13V
±0.
5V
13V
±0.
5V
CN2
pin10
0V
0V
61V
±5%
pin7
0V
0V
24V
±2.
5V
pin5
0V
0V
-24V
±2.
5V
pin4
0V
0V
-61V
±5%
pin1
0V
0V
16-23V
(2)
(5)
(6)
(3)
(4)
(1)