HP HP-97 - Page 81

Component-Level Maintenance
\PER
/ANCE XA12P1 Ji; XAlzm XAiZPZ
L N/ N\
N\ / \ /
2 N P 5 9 14 10 11 12 16 13 15 TP7 3 4 6 7 8 9 10 11 12 13 5§ 2 1 7 8 17 18 2 1 4 5 &
/N Ab/\/h/\fi/\/fi/\/\ /N /\/\/(\A\/}/\/\A\AN m/\/\/r\m/\m / T
|l <l w| | o LRlwVw]| »wn| = - ||~
g 2 E 9) 53‘ c]/:> 8 8 8 LuL) g 8 a 2| 2|z | lg E % = wf e i > >
> o wn > >
_ R4 s
FLG Vg ‘
9 | 1
2 94 5 3 88 383 % &
> VGa
u2
ROM @ C (—12.0V)
= = z (+6.25V) 1 __U 28
U
22
5
3
s
o
>
yv
MoT
Vss ss _@
21 Q I1o 1 12 [13 15J16<L17 18 ‘ | Ves O s _ ’
RCD
B
Vga
WPS
3
SYNC
_
|
MTRS [
F2
PORO
_
|
HDS
POR
WO
_
|23
u1 PWO PWO SF1
AcT
®
575
122
16
RB
)3
SF2
v Ra CRC
— |20
14 WE SF3
LC1 .
13
IS/IA LC2 b «ee
12
w8
SF4
DATA
17
1
—
BCD
IS
VB
|
16 +50V
9 SYNC <
A
TP3
TP4
14
15
Q IS/1A O DATA 92 —O Vga
KBE R10
IS/1A
g DATA
02
01
SYNC Vg +5.0V
TP1 Q4
Y Vg SYNC I
?15 Vss Vss
' 1 8
> r w
ROM 1 ROM 5
, [4 5 | [a 5 |
. 2 s 0 DATA " DATA
- o > 6 v !
14 Veae Vge
Vss Vss
1 8
I Uil 2 Ugne
92 ue IS 2 ysg IS
(7 ROM 2 5] (7] ROM 6 5
2 a1 DATA > f 4 0 DATA 5 l
Vga
\S
Vee
VY 8
BATTERY POWER . SYNCU "
+
i< <= 1w o=
J2P1 vSSoT ROM 3 @1 =
S 3| | = <| < IS
z 2 ol 0| o | g 6“
w > I - - > >
/NN NN NP —
6 17 7 2 4 3 7 8
XA2P2
Figure 4-5. Logic PCA (Al) Schematic Diagram
4-19