Texas Instruments 990 - Page 30

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945424-9701
KEYBOARD HOUSiNG
KEYBOARD
"
PWB
INTERCONNECT ION
CABLE
DISPLAY UN IT HOUSING
I POWER/LOG IC
PWB
J 1- 1
>
KBDT1
>-----------------------------------------------------------.)J1-1
"
J 1-2
)
,__ _______________________ K ___ s_o_T_2 ____________________________ )-.Jt-z
J 1- 3
>
KBDT3
>--~--~--------------------------------------------------)~Jt-3
Jt-4
>-------------------------K __ B_D_T_4 ____________________________ )-.Jt-4
>
J1-5
>-------------------------K_B_D_T_s ____________________________ ')~Jt-5
>
Jl-6
>
KBDT6 ~
>---------------------------------------------------------7~Jl-6
Jl-7
>
>------------------------K __ B_D_T_7 ____________________________ >_.J1-7
J1-8
>
,,_ _______________________ K __ B_D_T_B ____________________________ )_.J1-8
J1-9
>
KBSIN- ~
>----------------------------------------------------------7 .... Jt-9
J 1-10
>
)
)
,
REPEAT- '
>---------------------------------------------------------_,.7J1-10
l. \
\
(A)136259
Figure 1-11. Model 911 VDT Keyboard-to-Power/Logic PWB Signal Interface
DISPLAY UNIT HOUSING
INTERCONNECTION CABLE
VDT CONTROLLER
POWER/LOGIC \
PWB I
J2-3
>
TET1T
> J4-31
Js-3 ')
Tt:'"T""I..,..
>
IL- I .C:. I
) J4-4 ~
J2-4
JS-4 r
>
I
TRD1T ) VOTO
VDTl
J2-5
J4-5
JS-5
\..
I
I
TRD2T
) J4-6)
J5-6J
J2-6
)
I
I
)
)
\
(A;t 36260
Figure 1-12. Model 911 VDT Power/Logic PWB-to-VDT Controller Interface
1-20
Digital Systems Division