Pioneer f-502 Service Manual page 117

Power Down (Blinking in Red)
D15 to D18
ADDRESS ASSY
AD1 AD1
D19
X DRIVE ASSY
XDRV PD
XDD PD
X1
XSUS PD
D20
SCAN PD
SCN5V PD
YDRV PD
Y DRIVE ASSY
YDD PD
Y1 Y1
YSUS PD
D3501
ADR PD
to
D3502
OR
D3151
to
D3155,
D3162
OR
IC3151
Module Microcomputer
PDP4280HD, PDP5080HD
DIGITAL ASSY
D21
DRF SW
IC3155
PD
EXT PD
MUTE
Circuit
PD MUTE B
PS PD
PD TRG B
117
Note:
The figures to indicate the number of
times the LED flashes when power-down
occurs in the corresponding route.
POWER SUPPLY UNIT
DRF SW
Relay
Control
Protection
Circuit