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Troub
les
hootin
g
5-1
3
68
810
96C7
7
-O
Se
ptem
ber
2
6
, 2
003
Fi
gur
e 5-
5.
W4 Cont
ro
l
Head
(Sheet
1
of
2)
START
Check U45
(+5V Reg.)
Repair
Is
+5V OK
?
With no buttons pressed, check U1
pins 8-11 for activity.
Activity
on all pins
?
(8-11)
Activity
on one pin
only
?
No activity
at all
Check U1 for
proper operation
and repair
Check that pin for a shorted button
closure somewhere on the line.
Check return lines (U1 pins 13-15).
Check R120-R122.
Press buttons and
check return lines
(U1 pins 13-17).
Check R120-R124
Repair
MAEPF-22619-A
CONTROL UNIT POWERS UP
PROPERLY BUT BUTTON PRESSES
DO NOT WORK.
YES
YES
NO
YES
NO
NO
NO
Содержание ASTRO W5
Страница 2: ......
Страница 12: ...x List of Tables September 26 2003 6881096C77 O Notes ...
Страница 16: ...September 26 2003 6881096C77 O Notes xiv Commercial Warranty ...
Страница 24: ...September 26 2003 6881096C77 O 1 8 Introduction Control Heads Notes ...
Страница 68: ...7 8 Exploded Views and Parts Lists Large Pushbutton Parts September 26 2003 6881096C77 O Notes ...
Страница 125: ......