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1-10
112
CONTROL PANEL LEOs MINI MAP
• LEDs may be swapped to isolate failures.
• Use this figure to locate a control panel LED problem.
• The LEDs flash on for about 1 second during
power-on.
For detailed information,
• For Mini MAP example, see Troubleshooting Aids (212).
Grounding the' -force POR' line at 1-G-D11 turns on
all LEDs.
Conditions after Power-On
• The' +5 Vdc' line is active.
Service Aids
CAUTION
• The display station will
not
be damaged if
powered-on after the control panel cable is
disconnected.
• The forward resistance of a good LED is about 4,000
ohms and the reverse resistance of a good LED is
more than 20,000 ohms.
Grou~ding
any indicator line will damage the LED or the
main planar board.
*The voltage at this point is
less than
+5V
when the LED
is on. The voltage only goes
to 0 when the LED is open.
+5
Vdc
4>
-Line Sync
_[>
-Line Check
-t>
-Internal Check
Tools
• Ground the CE meter on frame ground at the power
supply.
Planar Board
I
I
I
I
I
Interposer
Control Panel Cable
Control Panel LEDs
Black
(+5V)-~---'~~
Wire
I
I
___ I _ .....
iiiiiiiiiii;;~
I
-;--
I
:
=:::;:
I
-t"=~
I
=+:::~
I
=F::: :::::
-r----
-l-n
I
B02
D02
The yellow wire goes on the
I
flat side of the LED.
<I(
1-H-D03
~BlaCk~Whitedot)
* "
:
Line Sync
1-H-D09
VVv--<~(------~
>------+-Yellow--tr----.
I
~
4<
l-H-DlO
~[~~~:~
Line
Check
*
I
1-H-D11
~ Internal Check
'V\I\r---'«
-Yellow----+--.
Connector H
Flat Side
LED
*
I I
I
Storage Check
I
~laCk
-Storage Check
1-H-D12
-i>------------'\AI'v-<.I(
Yellow--t--..
--l>
-Ready
Drivers
,
B l a C k = p
*
,
I I
Ready
1-H-D13
'\AI'v-<.
<
Yellow
I
When you replace LEDs, align identified lead (white dot
I
or flat side) with the yellow wire in the LED holder.
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