IBM 5280 Maintenance Information Manual page 122

369'
LED OUTPUT SERVICE CHECK
1. Connect the negative probe of the multimeter to
II
(ground).
2.' Set the multimeter scale to 5 Vdc and connect
the positive probe to
0
(3150 LED voltage).
3. (3150) Check for-a voltage level of 1 Vdc through 2 Vdc.
4. Move the positive Pj'obe to
fJ
(51TO LED voltage).
5. Check for a voltage level of 1 Vdc through 2 VOC (51 TO).
51TO
II
PTXCP TPA10
5 1 I
TPA08
1000 01 0 0
o
TPB060 0 0 0 0
D o o
TPA06
00 1 TPB07
o
00
00
. TPC030 0 01
TPD02
3150
369
4 1
~
PTXCP
BA
00 1
o
00
00
00
00
00
00
00
00 I/O CP
00
00
00
00
00
00
00
0018
I01B
~A
2 1
LEDCP
o
TP24V
TPLED
SCP
4 1
Page of SY31-0602-0
As updated December 5, 1980
By TNL SN20-9590
TPG02 0
TPH05 0
o TPHLD
100 01
LED and PTX Assemblies 49