Pioneer f-502 Service Manual page 78

Power Down (Blinking in Red)
Number PD Circuit in Defective PCB
of Blinks Operation Assy
2 POWER POWER SUPPLY
50 (43) SCAN A, B
50 (43) Y DRIVE
3 SCAN
50 (43) X DRIVE
50 (43) SCAN A, B
4 SCN-5V
50 (43) Y DRIVE
6 Y-DCDC 50 (43) Y DRIVE
7 Y-SUS 50 (43) Y DRIVE
8 ADRS 50 (43) ADDRESS
9 XDRIVE 50 (43) X DRIVE
10 X-DCDC 50 (43) X DRIVE
11 X-SUS 50 (43) X DRIVE
OVP : OVER VOLTAGE PROTECT
UVP : UNDER VOLTAGE PROTECT
Reason for PD
Point to be Checked
(Power-down)
SCAN IC
VH UVP Y SUS BLOCK
VH DC/DC
Disconnection of cable detected CN2001, CN2350
VH UVP IC1202
Disconnection of cable detected CN2401, CN2402
SCAN IC
IC5V DC/DC
IC5V UVP
Y SUS BLOCK
VOFS DC/DC
VOFS UVP
Y SUS BLOCK
Vprst UVP Vprst Regulator
Power-down caused by
Y RESONANCE BLOCK
detection of middle-point
voltage
Y SUS BLOCK
Address power-down ADDRESS RESONANCE BLOCK
Disconnection of cable detected CN1501, CN3501-CN3504
Disconnection of cable detected CN1001
Disconnection of cable detected CN1201
VRN DC/DC
VRN UVP
X SUS BLOCK
Power-down caused by
detection of middle-point X RESONANCE BLOCK
voltage
PDP436PU, PDP506PU, PRO436PU, PRO506PU
Possible Defective Part
SCAN IC
IC2252, IC2253
IC2502, L2501
IC1202
SCAN IC
Q2605, R2647
R2352
Q2606, R2619, R2620
IC2252, IC2253, Q2280, Q2281
Q2531, Q2532, IC2535
IC2101
Q2221
D1634
Q1323, R1332, R1333
R1204, Q1272
IC1101
78
Remarks
VH-GNDH short-circuit
VSUS-SUSOUT,
SUSOUT-SUSGND short-
circuit
VSUS-SUSOUT,
SUSOUT-SUSGND short-
circuit
MSKS-SUSOUT short-circuit
V+ADR-GND_ADR short-circuit