Step Gains
.............................
Cal Oscillator (P/O A4 Assembly)
...................
Cal Oscillator Unlock at Beginning of IF Adjust
............
Inadequate CAL OSC AMPTD Range
.................
300 Hz to 3 kHz Resolution Bandwidth Out of Specification
.......
Low-Pass Filter
...........................
Sweep Generator ..........................
AM/FM Demodulation, Audio Amplifier, and Speaker
..........
10. Controller Section
Troubleshooting Using the TAM
....................
Blank Display ...........................
Digital Signature Analysis (DSA)
....................
Display Problems ...........................
Line Generators
..........................
Blanking ..............................
Display Jumbled or Trace Off Screen
.................
Intensity ..............................
Bad Characters or Graticule
.....................
Long Lines Dimmer Than Short Lines
.................
Analog Zero-Span Problems (Non-Option 007)
..............
Frequency-Count Marker Problems
...................
Frequency Counter
..........................
State- and Trace-Storage Problems
...................
Keyboard Problems
..........................
11. Synthesizer Section
Troubleshooting Using the TAM
....................
Troubleshooting Test Setup
......................
Confirming a Faulty Synthesizer Section
.................
General PLL Troubleshooting
.....................
PLL Locked at Wrong Frequency
...................
Unlocked PLL
...........................
Unlocked Reference PLL
........................
Operation
.............................
Troubleshooting
..........................
Third LO Driver Amplifier
.......................
Unlocked Offset Lock Loop (Sampling Oscillator)
.............
Operation
.............................
Troubleshooting
..........................
Check path to phase/frequency detector (steps 14-19)
.........
Unlocked YTO PLL
..........................
Operation
.............................
Troubleshooting an Unlocked YTO PLL
................
Unlocked Fractional N PLL
......................
Operation
.............................
Confirming an Unlocked Condition
..................
Fractional N PLL
..........................
Frequency Span Accuracy Problems
...................
Determining the First LO Span
....................
Confirming Span Problems
......................
9-31
9-32
9-33
9-33
9-34
9-38
9-38
9-38
10-2
10-2
10-4
10-4
10-4
10-5
10-7
10-10
10-10
10-11
10-12
10-13
10-14
10-15
lo-16
11-2
11-8
11-8
11-13
11-13
11-15
11-16
11-16
11-16
11-19
11-20
11-20
11-20
11-22
11-23
11-23
11-25
11-31
11-31
11-31
11-32
11-36
11-36
1 l-37
Contents-6
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