IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Testing the Voltage Converter (8551)

1.  Power-off the computer.
2.  Power-off all attached devices and disconnect them from the computer.
3.  Unplug the AC adapter from the computer.
4.  Remove the battery pack and the bottom cover.
5.  Disconnect the standby-battery connector and the flexible  cable from connector CN6 on the voltage converter.
6.  Power-off the computer.
7.  Plug the AC adapter into the computer.

       The computer goes into suspend mode in about 20 seconds after  plugging in the AC adapter. The following procedure must be performed  during this period. If the computer is already in suspend mode, unplug  the AC adapter and plug it in again to reactivate it.

8.  Check the voltages of the voltage converter  using the following table.

Conn- ector	Pin	Signal	V dc Min.	V dc Max.
CN5	1	VCCA	+4.9	+5.3
CN5	3	VCCB	+4.7	+5.3
CN5	7, 8	GND	-	-
CN5	9, 10	GND	-	-
CN5	13	+20 Vdc	+19.0	+21.0
CN5	21	POWER_GD	+4.0	+5.3
CN5	32	POWER_ON#	0	+0.5
CN7	2	VCCG	+4.7	+5.3
CN7	23,24	GND	-	-

•  If all the voltages are correct, the voltage converter is good.
•  If +.20 V dc is not correct, check the output voltage of the AC  adapter (see 'Testing the AC Adapter'). If the voltage is correct, replace  the voltage converter.
•  If any of the measured voltages except +.20 V dc is not correct,  replace the following FRUs one at a time to correct the problem.
  1.  Voltage converter
  2.  System board
  3.  I/O panel assembly

NOTE: Reconnect the standby-battery connector and the flexible cable that were removed in Step 5, before leaving this procedure.

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