Chapter 2 53
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Fan(s) Are Not Operating
Control of the instrument fans comes from the A5 Power Supply assembly. This
signal is routed from the A5 Power Supply through the A6 Midplane board, where
there is a test point and LED to monitor the level, and is then routed to the A7
Motherboard where it is filtered before being sent to the Fans. When the Fans do
not come on it could be due to any one of these assemblies. This procedure will
help to determine which one is the cause.
This procedure assumes that the green Power On LED on the front panel does turn
on when the instrument is turned on. If it doesn't, refer to the “Green Power On
LED Does Not Illuminate” section before proceeding.
1. The instrument fans will only turn on when the instrument is connected to an
AC source that has a voltage level and frequency of that specified for the
instrument and the front panel On/Off button has been pressed. Before
proceeding verify that these requirements are being met. Refer to the
instrument rear panel for these requirements.
2. Remove the AC power cord and then remove the instrument cover. Refer to the
Chapter 13, “Assembly Replacement Procedures,” on page 225 in this manual.
3. Are both fans not spinning?
If yes:
Proceed to step 4.
If no:
Proceed to step 6.
4. Remove the MP7 Top Brace. Refer to Chapter 13, “Assembly Replacement
Procedures,” on page 225 in this manual.
5. Referring to Figure 2-5, verify that the Fan LED on the A6 Midplane board is
on. Is the Fan LED on?
If yes:
Measure the voltage level at TP1 on the A6 Midplane board. Is the TP1
voltage between +7 and +15 VDC
If yes:
Proceed to step 6.
If no:
Replace the A5 Power Supply assembly.
If no:
Replace the A5 Power Supply assembly.
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