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PD Circuit in
Defective Assy
operation
1
MR POWER
POWER SUPPLY Unit
2 POWER
43 X DRIVE Assy
43 Y DRIVE Assy
SCAN
43 SCANA, B Assy
3
or Y 43 DRIVE Assy
43 SCANA, B Assy
4 SCN-5V
or Y 43 DRIVE Assy
5 Y-DRIVE
43 Y DRIVE Assy
6 Y-DCDC
43 Y DRIVE Assy
7 Y-SUS
43 Y DRIVE Assy
43 ADDRESS Assy
8 ADRS
9 X-DRIVE
43 X DRIVE Assy
10 X-DCDC
43 X DRIVE Assy
43 X DRIVE Assy
11 X-SUS
12 DIG-DCDC
DIGITAL VIDEO Assy
13 IC4
DIGITAL VIDEO Assy
OVP: Over Voltage Protection
Reason for Power-down
Point to be Checked
VSUS UVP
X SUS BLOCK
VSUS UVP
Y SUS BLOCK
VH UVP
SCAN IC
VH UVP
VH DC/DC
VH OVP
VH DC/DC
Disconnection of cable detected
CN2001, CN2301
CN2101, CN2102, CN2301
Disconnection of cable detected
SCAN IC, IC5V DC/DC Y SUS
IC5V UVP
BLOCK
IC5V OVP
IC5V DC/DC
+16.5V OCP
Y SUS BLOCK
VOFS UVP
VOFS DC/DC
VOFS OVP
VOFS DC/DC
Power-down caused by
Y RESONANCE BLOCK
detection of middle-point voltage
Disconnection of cable detected
CN1501
ADR RESONANCE BLOCK
Power-down caused by
detection of a power surge
Disconnection of cable detected
CN1001, CN1201
+16.5V OCP
X SUS BLOCK
VRN OCP
X SUS BLOCK
VRN OVP
VRN DC/DC
VRN DC/DC
VRN UVP
X SUS BLOCK
Power-down caused by
X RESONANCE BLOCK
detection of middle-point voltage
DCDC +3.3V, +1.5V OVP
DC DC CONVERTER BLOCK
IC4 Drive STOP
IC4 BLOCK
UVP: Under Voltage Protection
Possible Defective Part
IC1203, IC1207
IC2303, IC2307
SCAN IC
IC2401, IC2402, IC2410, L2401
IC2402, IC2410
SCAN IC, Q2401, Q2402, IC2304,
IC2403, IC2411
IC2303, IC2307
IC2304, IC2305, R2332
IC2404, IC2412, Q2404, Q2407, Q2312
IC2404, IC2412
Q2202, Q2203, Q2214, Q2205, Q2206,
Q2208, Q2209, Q2212, IC2201, IC2202,
D2201, D2206, D2220, D2211, D2225,
D2230,
Control signal series resistors
R1631, Q1601, D1602
IC1203, IC1207
IC1206, R1230, IC1205
Q1205, R1226, R1251
IC1403, IC1404
IC1402, IC1403, IC1404
Q1205, R1226, R1251
Q1102, Q1103, Q1114, Q1105,
Q1108, Q1109, Q1111, Q1112, IC1101,
IC1102, D1103, D1113, D1118, D1125,
D1129, D1130,
U5602 (DC DC CONVERTER Module)
IC5401
OCP: Over Current Protection
76
If the elapsed time from relay-on until the LED
in the power supply unit lights is about 2-4
seconds, the defective assembly may be the
43 X or Y DRIVE.
(mask module)
(mask module)
, IC2301,
(mask module)
, IC1204,
(mask module)
Control signal series resistors
Remarks
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