Power Supply Voltages / Fan - IBM PS/2 50 Hardware Maintenance Service

5.0 Power Supply Voltages / Fan

If the fan is not running, check the fan connector for -9.0 to -15.0 Vdc,
approximately -12 Vdc desired.
fan. If the voltage is not correct, check the power supply voltages.
PICTURE 2
Remove the power supply and place it with the connector facing up.
Power-on the power supply and check for the voltages listed below.
voltages are not correct, check the power cord for continuity.
power cord is good, replace the power supply.
+------------------------------------------------------------------------+
¦ Vdc ¦ Vdc ¦ -Lead
¦ Minimum ¦ Maximum ¦
+---------+---------+---------+------------------------------------------¦
¦ ¦ ¦
¦ -9 ¦ -15.0 ¦
¦ +9.0 ¦ +15.0 ¦
¦ +3.7 ¦ +6.2 ¦
¦ ¦ ¦
+------------------------------------------------------------------------¦
+------------------------------------------------------------------------+
PICTURE 3
IBM PS/2 Model 50 HMS
Power Supply Voltages / Fan
If the voltage is correct, replace the
¦ +Lead
Pin ¦ Pin
¦
2 ¦ 1
2 ¦ 3
2 ¦ 15
¦
5.0 - 1
If the
If the
¦
¦
¦
¦
¦
¦
¦