Pioneer PDP-4280HD

PDP-4280HD
63
5
6
7
8
56
7
8
C
D
F
A
B
E
5.3 DIAGNOSIS OF PD (POWER-DOWN)
5.3.1 BLOCK DIAGRAM OF THE POWER-DOWN SIGNAL
Block Diagram of the Power-Down Signal
S
S
S
OR
ADDRESS ASSY
DIGITAL ASSY
POWER SUPPLY UNIT
X DRIVE ASSY
Y DRIVE ASSY
Relay
Control
Protection Circuit
Module Microcomputer
PD
MUTE Circuit
YSUS_PD
YDD_PD
YDRV_PD
SCN5V_PD
SCAN_PD
XDRV_PD XDD_PD
XSUS_PD
ADR_PD
DRF_SW
DRF_SW
PD_MUTE_B
PS_PD
EXT_PD
PD_TRG_B
D21
IC3155
IC3151
D3151
to
D3155,
D3162
D3501
to
D3502
D15 to D18
D19 D20
Y1Y1 X1
AD1AD1
Note: The figures  to  indicate the number of times the LED flashes when power-down occurs in the corresponding route.
OR