• Power-down diagnosis (defective points)
PD Circuit in
operation
Defective Assy Reason for Power-down Point to be Checked Possible Defective Part Remarks
1 MR POWER
2 POWER
POWER SUPPLY Unit
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
50 X or Y DRIVE.
50 X DRIVE Assy VSUS UVP X SUS BLOCK IC1203 - IC1207 (mask module)
50 Y DRIVE Assy VSUS UVP Y SUS BLOCK IC2303 - IC2307 (mask module)
3 SCAN
50 SCAN A, B Assy
or Y 43 DRIVE Assy
VH UVP SCAN IC SCAN IC
VH UVP VH DC/DC IC2401, IC2402, IC2410, L2401
Disconnection of cable detected CN2001, CN2301
4 SCN-5V
50 SCAN A, B Assy
or 43 Y DRIVE Assy
Disconnection of cable detected CN2101, CN2102
IC5V UVP
SCAN IC, IC5V DC/DC Y SUS
BLOCK
SCAN IC, Q2401, Q2402, IC2304, IC2309
IC5V OVP IC5V DC/DC IC2403, IC2411
5 Y-DRIVE 50 Y DRIVE Assy +16.5V OCP Y SUS BLOCK
IC2303 - IC2307 (mask module), IC2301,
IC2304, R2309
6 Y-DCDC 50 Y DRIVE Assy
VOFS UVP VOFS DC/DC IC2404, IC2412, Q2404, Q2407
VOFS OVP VOFS DC/DC IC2404, IC2412
VH OVP VH DC/DC IC2402, IC2410
7 Y-SUS
50 Y DRIVE Assy
Power-down caused by detection of
middle-point voltage
Y RESONANCE BLOCK
Q2202, Q2214, Q2205, Q2206, Q2208,
Q2209, Q2211, Q2212, IC2201, IC2202,
Control signal series resistors
DIGITAL VIDEO Assy
Power-down caused by detection of
middle-point voltage
DIGITAL VIDEO Assy IC5401, Control signal series resistors
8 ADRS 50 ADDRESS Assy
Disconnection of cable detected CN1501
Power-down caused by detection of a
power surge
ADR RESONANCE BLOCK R1631, Q1601, D1602
Power-down caused by detection of
middle-point voltage
ADR RESONANCE BLOCK Q1602, C1609, D1606, D1607
9 X-DRIVE 50 X DRIVE Assy
Disconnection of cable detected CN1001, CN1201
+16.5V OCP X SUS BLOCK
IC1203, IC1207 (mask module),
IC1204, IC1206, R1230
VRN OCP X SUS BLOCK Q1205, R1226, R1251
10 X-DCDC 50 X DRIVE Assy
VRN OVP VRN DC/DC IC1403, IC1404
VRN UVP
VRN DC/DC IC1402, IC1403, IC1404
X SUS BLOCK Q1205, R1226, R1251
11 X-SUS
50 X DRIVE Assy
Power-down caused by detection of
middle-point voltage
X RESONANCE BLOCK
Q1102, Q1103, Q1105, Q1106, Q1108,
Q1109, Q1111, Q1112, IC1101, IC1102,
Control signal series resistors
DIGITAL VIDEO Assy
Power-down caused by detection of
middle-point voltage
DIGITAL VIDEO Assy IC5401, Control signal series resistors
12 DIG-DCDC DIGITAL VIDEO Assy DCDC +3.3V, +1.5V OVP DC DC CONVERTER BLOCK U5601 (DC DC CONVERTER Module)
OVP : Over Voltage Protection
UVP : Under Voltage Protection
OCP : Over Current Protection
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