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Troubleshooting
To check the Low Voltage Power Supply
Table 5-4 Low Voltage Power Supply Tolerances
4
If the +5.1 V measurement is out of tolerance, adjust the +5.1 V
adjustment on the power supply.
5 If the -5.2 V measurement is out of tolerance, adjust the -5.2 V
adjustment on the power supply.
The +15.75 V supply is not adjustable, and is dependent upon the +5.1 V supply.
CAUTION BEWARE OF HAZARDOUS VOLTAGES !
Be careful when performing component-level repair. Voltages greater than
300 Vdc exist, and can cause injury.
Supply Voltage Tolerance
+5.1 V ±153 mV (+4.947 V to +5.253 V)
-5.2 V ±156 mV (-5.04 V to -5.36 V)
+15.75 V +1.260 V, -787 mV (+14.963 V to +17.010 V)
+3.3 V ±100 mV (+3.20 V to +3.40 V)
If the Fuse is Blown
If the power supply fuse is blown, the power supply is defective, and you must
replace it. See the “Replaceable Parts” chapter for information about removing the
power supply.
service.book Page 12 Wednesday, December 18, 2002 8:35 AM