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If the red LED is still blinking:
Replace the power supply.
If the red LED is now o :
Go to the following section \Remove Assemblies" (the supply is being loaded down by another
assembly).
Measure the Power Supply Voltages
Remove the backplane cover from the rear panel. Figure 4-3 shows the pinout for J1. here
are four main supplies, each with its own return, plus the standby voltage which powers the
nonvolatile SRAM on the CPU board. Measure the voltages with a voltmeter. Values should be
within 5% of nominal for all but the +13 V supply.
Insert artwork here.
Figure 4-3. Power Supply Connector, as Viewed from Rear Panel
If the voltages are not correct:
Remove the power supply/display assembly, plug in the AC power, and switch the analyzer's
line power ON. Check the four power supply LEDs visible from the right side of the display
enclosure (as viewed from the front).
If one or more LEDs are o :
Replace the power supply.
If all the LEDs are on:
Reseat the power supply/display assembly, making sure there's a good connection to the rear
panel. Measure the voltages again. If the problem persists, check connectors on the power
supply and on backplane board.
If the voltages are correct, but there is a probe power problem:
Remove the front panel and check the fuses on the back of the front-panel PC board.
Continue with the \ roubleshooting Digital Group Problems" section.
4-8
T roubleshoot ng and Block D agrams
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