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Service Screen
Troubleshooting with the SERVICE Screen
To change the counter connection, move the cursor in front of the
Counter Connection field and push the cursor control knob. A
Choices menu will appear, then move the cursor to the desired circuit
node and push the cursor control knob.
Gate Time
This field is used to adjust the Test Set's internal frequency counter's
gate time. A shorter gate time may enable you to see frequency
fluctuations that might not be seen using a longer gate time.
To change the gate time, move the cursor in front of the Gate Time
field and push the cursor control knob. Rotate the cursor control knob
until the desired gate time (10 to 1000m in 10m increments) is
displayed, then press the cursor control knob.
Latch
This field is used to manually alter the circuit latches that control
switch, DAC, and gain settings within the Test Set. The value of the
selected latch is displayed and changed in the Value field. Some
settings are read-only.
To set a switch, DAC, or gain setting:
1. Move the cursor in front of the Latch field and push the cursor
2. Move the cursor to the desired latch name and push the cursor
3. Move the cursor in front of the Value field and push the cursor
4. Rotate the cursor control knob to modify the value (hexadecimal).
If any of the switches, DACs, or gain settings are changed with the
NOTE
Latch field, the Test Set will generate the message "Direct latch
write occurred. Cycle power when done servicing." To clear
this message, cycle the Test Set's power. Upon power-up, the internal
controller will return the Test Set to its default settings and values.
The first part of the names in the Choices menu relates to the
assembly where the switch, DAC, or gain setting is located. Some latch
names are not listed here.
• dstr: Modulation Distribution
• aud1: Audio Analyzer 1
• aud2: Audio Analyzer 2
• refs: Reference
• inpt: Input
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S:\agilent\e8285\ALR\Book\chapters\service_scrn.fm
control knob. A Choices menu will appear.
control knob.
control knob.
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Table of Contents
Troubleshooting
