Voltage Level Checks - IBM 5251 Series Maintenance Information Manual

182
VOLTAGE LEVEL CHECKS
Voltage levels can be checked on the power cable
connected to the main planar board or on the power
cable connected to the power supply.
DANGER
Line voltage is present at the power supply.
1-100
Low Voltage
DC Voltage
Planar Board
Connector
Level
Connector G
1,4,7,8 Ground 005-010
3,5,6 +5 (+4.6 to +5.5) 802, 803,
002,003
2 -5 (-4.6 to -5.4) 806
9 +8.5 (+7.7 to +9.4) 809, 811
(The power cable is part of a cable assembly that carries
the display assembly signal lines to the main planar
board.)
• The power supply supplies power to convector G on
the planar by way of the low voltage Connector.
• The planar supplies signals to the display assembly.
(The display assembly has its own power supply.)
Planar
Interposer Display Signal/Planer Power Cable Power Supply
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8
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_--L- 7
- -
I --
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Connector G
:=~
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+=:=
- r " -
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::::~
:!:- - -
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B02
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,
5
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Connector
3
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1·G·o05,olO
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1,4,7,8 (Ground)
1·G·B02,B03,o02,o03
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3,5,6 (+5 Vdc)
1·G·B06
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2 (·5 Vdc)
l·G·B09,Bll
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9 (+8.5 Vdc)
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>1>
<K
>1>
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