PDP-425CMX
124
1234
1234
C
D
F
A
B
E
• Diagnosis of the Power-down
Frequency
of Flashing
of Red LED
PD
Operation
Defective Board
Assy
Reason for
Power-down
Point to be Checked
Possible Defective
Parts
Remarks
2 POWER POWER SUPPLY
3 SCAN
SCAN A, B
VH UVP
SCAN IC SCAN IC
Short-circuiting between VH and GNDH
Y DRIVE
Y SUS BLOCK IC2252, IC2253
Short-circuiting between VSUS and
SUSOUT or SUSOUT and SUSGND
VH DC/DC IC2502, L2501
Detection of connector
disconnection
Detection of connector
disconnection
Detection of connector
disconnection
Detection of connector
disconnection
Detection of connector
disconnection
CN2001, CN2350
X DRIVE VH UVP IC1202 C1202
Short-circuiting between VSUS and
SUSOUT or SUSOUT and SUSGND
4 SCN-5V
SCAN A, B
CN2401, CN2402
IC5V UVP
SCAN IC SCAN IC
Y DRIVE
IC5V DC/DC Q2605, R2647
Y SUS BLOCK R2352
6 Y-DCDC Y DRIVE
VOFS UVP
VOFS DC/DC Q2606, R2619, R2620
Y SUS BLOCK
IC2252, IC2253, Q2280,
Q2281
Short-circuiting between MSKS
and SUSOUT
Vprst UVP Vprst Regulator Q2531, Q2532, IC2535
7 Y-SUS Y DRIVE
Detection of midpoint
voltage PD
Y RESONANCE BLOCK IC2101
Y SUS BLOCK Q2221
8 ADRS ADDRESS
Address PD
ADDRESS RESONANCE
BLOCK
D1634
Short-circuiting between V+ADR
and GND_ADR
CN1501, CN3501-CN3504
9 XDRIVE X DRIVE CN1001
10 X-DCDC X DRIVE
CN1201
VRN UVP
VRN DC/DC Q1323, R1332, R1333
X SUS BLOCK R1204, Q1272
11 X-SUS X DRIVE
Detection of midpoint
voltage PD
X RESONANCE BLOCK IC1101
* When the Power-down is occured as the key-lock is effective.
• Please pull out the AC-plug, and make the state to stand-by mode.
• The lock is cancelled when the key-lock button is pressed for 5 seconds.
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