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Philips PCL304 - Page 51

Philips PCL304
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8-21
8
zt
S
5
4
3
‘es
1
POWER
BOARD
CONNECTOR
CIRCUITRY
D
PB
Buffer
PB
connector
(write
to
PCU)
connector
ze
7
22
.
3
5
74RC374
CNI2
|
|
sp?
19
PCUD?
PCUDe
L
~HOSTUR
4
:
S05
1s____PCUDE
=HOSTRD
S
E
$05
15
PCUDS
=PCUINT
Q
S04
2
cuo4
PURGOOD
;
p
SD3
9
PCUD3
~KIURAM
sb2
5
pcuo2
ar)
4
SD1_
5
Peud!
-PDS
:
|
|
|
$00
2
PCUDG
a
fii
Cc
VEE
|
19
a
|
|
|
hy
|
pute!
0
-PCUWR
(read
from
PCU)
74HC374
-CPUCYC
74ACB4
Let
OPTBUFUL
~PCURD
B
J?
p21
RO10
$20
Seas
HOSTNMI
g
pinaiad
Buzzer
ae
ie}
>
circuitry
1K
NMI
=
J16
CONTRAST
SS
ee
BRIGHT
interrupt
CPU
R187
10K
i
A
Sheet
14
of
17
no
45
789
Alz
CS
55
838

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