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HCD-GPX33/GPX55/GPX77/GPX88
17
SECTION 5
TROUBLESHOOTING
Switching Regulator Diagnosis Flow
The Output from Switching regulator is checked.
Is following power voltage up to standard?
Standby
Demo mode Power On
CN 201 pin1
CN 401 pin9
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 201 :pin7 Low (0V) Hi (3.3V)
Hi (3.3V)
13V±0.5V
13V±0.5V
0V
61V±2.5V
pin6
0V
23V±2.5V (HCD-GPX77/GPX88)
24V±2.5V (HCD-GPX33/GPX55)
pin4
0V
-23V±2.5V (HCD-GPX77/GPX88)
-24V±2.5V (HCD-GPX33/GPX55)
pin1
0V
-61V±2.5V
(1) AC
input
(2) Fuse
(3) Sub Power transformer
(4) CN 201 Connector
pin1-2: 13V
pin3-4: GND
pin5: AC-DET
pin7: MAIN-ON
(5) MAIN Power transformer
(6) CN 401 Connector
pin1-3: V1- (DC-61V)
pin4: V2- (DC-24V)
pin5: GND
pin6: V2+ (DC+24V)
pin7-9: V1+ (DC+61V)
(2)
(1)
(4)
(6)
(3)
(5)
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