Ilt-1 Power Supply Failure And Self-Test - Agilent Technologies PSG Series Service Manual

Troubleshooting
Getting Started with Troubleshooting

ILT-1 Power Supply Failure and Self-Test

When the signal generator appears to be dead (no display or fan) there is often little evidence that points
directly to the cause. This section provides steps and solutions to typical failure modes.
Immediately unplug the signal generator from the ac power line if the unit shows any of the
CAUTION
following symptoms:
• Smoke, arcing, or unusual noise from inside the instrument.
• A circuit breaker or fuse on the main ac power line opens.
These potentially serious faults must be corrected before proceeding.
Perform These Power Supply LED Checks
Check the front panel LEDs (located next to the LINE switch) for normal operation in both standby and
power-on conditions. Normal operation is indicated as follows:
Power Switch
If normal operation is not observed, go to the assembly-level troubleshooting section entitled Power Supplies
vs. Assemblies Matrix
If the fan does not operate when the instrument is powered on
Go to the assembly level troubleshooting section and use the Power Supplies vs. Assembly Matrix
(Table 1-13 on page 1-18) to verify the fan voltage.
If the fan operates when the instrument is powered on
Go to "ILT-3 A18 CPU Turn-On Test" on page
1-4
Yellow LED
Standby
Power-On
(Table 1-13 on page 1-18).
Green LED
On Off
Off On
1-6.