PDP-4271HD
96
1
2
3
4
1
2
3
4
C
D
F
A
B
E
5.2 DIAGNOSIS OF PD (POWER-DOWN)
5.2.1 BLOCK DIAGRAM OF THE POWER DOWN SIGNAL
S
S
OR
ADDRESS ASSY
DIGIT
AL ASSY
PO
WER SUPPL
Y UNIT
X DRIVE ASSY
Y DRIVE ASSY
Rela
y
Control
Protection
Circuit
Module Microcomputer
PD
MUTE
Circuit
YSUSTN_PD
YDD_CNV_PD
YDRIVE_PD
SCN5V_PD
SCAN_PD
XDRIVE_PD
XDD_CNV_PD
XSUSTN_PD
ADR_PD
DRF_B
PD_MUTE
PS_PD
EXT_PD
PD
PD_TRG_B
D21
P4
IC3155
IC3151
D3151
to
D3162
D3501
to
D3502
D15 to D18
D19
D20
Y1Y1
X1X1
AD1AD1
Note:
The figures
2
to
-
indicate the number of
times the LED flashes when power-down
occurs in the corresponding route.
OR