System Test Failure Troubleshooting In The Internal Test - Agilent Technologies E4991A Service Manual

Troubleshooting
Troubleshooting Using Internal Test
Table 4-1 Troubleshooting Information for Analog Test Failure
Test First Failed Test
No.
27 FREQ_A3_VCO
†††
: Suspicious assembly
††
NOTE
When many tests fails in Table 4-1, replace A21 Analog Interface Board or A10 Analog
Mother Board.

System Test Failure Troubleshooting in the Internal Test

When "System Test: Fail" is displayed in the internal test, check each error using the
following procedure.
•
•
•
NOTE
When "KEYBD TEST" is failed, perform the internal test using the mouse.
•
174
Test Point
VCO Output for A3
: Most suspicious assembly
ANALOG IF TEST
1. Turn off the instrument, and then turn on it.
2. If this fail still remains, replace A21 Analog Interface Board.
EEPROM TEST
1. Turn off the instrument, and then turn on it.
2. If this fail still remains, perform "EEPROM Initialize" and all adjustments using
the Adjustment Program as shown in Chapter 3, "Adjustment,".
3. If this fail still remains, replace EEPROM, and then perform "Write ID",
"EEPROM Initialize" and all adjustments using the Adjustment Program as shown
in Chapter 3, "Adjustment," and Chapter 8, "Post-Repair Procedures,".
4. If this fail still remains, replace A27 HDD, and then perform all adjustments using
Adjustment Program as shown in Chapter 3, "Adjustment," and Chapter 8,
"Post-Repair Procedures,".
KEYBD TEST
1. Check the status of each front key and turn off the instrument, and then turn on it.
2. If this fail still remains, replace A22 Front Keyboard.
SYSTEM COLOR TEST
1. Turn off the instrument, and then turn on it.
2. Usually, this fail is disappeared after rebooting
Probable Faulty Assembly
A1 Ref A3 A4
OSC Source Receiver
†† †††
A2 DC A5 Freq A6 Test
Bias(001) Ref(1D5) Head
Chapter 4