Pioneer f-502 Service Manual page 107

Power Down (Blinking in Red)
D15 to D18
50 ADDRESS ASSY
AD1 AD1
D19
XDRIVE_PD
50X DRIVE ASSY
XDD_CNV_PD
X1 X1
XSUSTN_PD
D20
SCAN_PD
SCN5V_PD
YDRIVE_PD
50Y DRIVE ASSY
YDD_CNV_PD
Y1 Y1
YSUSTN_PD
DRF_B
D3501
ADR_PD
to
D3502
OR
D3151
to
D3162
OR
IC3151
Module Microcomputer
PDP427CMX, PDP507CMX, PDP607CMX
50 DIGITAL ASSY
IC3155
D21
PD
MUTE
EXT_PD
Circuit
PD_MUTE
PS_PD
PD_TRG_B
107
Note:
2 -
The figures to indicate the number of
times the LED flashes when power-down
occurs in the corresponding route.
POWER SUPPLY UNIT
P4
Relay
PD Control
Protection
Circuit