HP 8753E - Page 13

7. Source Troubleshooting
Assembly Replacement Sequence ................ 7-2
Before You Start Troubleshooting ................ 7-2
Power. ............................ 7-3
1. Source Default Correction Constants (Test 44) ........
7-3
2. RF Output Power Correction Constants (Test 47) ...... 7-3
3. Sampler Magnitude and Phase Correction Constants (Test 53) 7-3
Phase Lock Error ....................... 7-4
Phase Lock Loop Error Message Check ............ 74
A4 Sampler/Mixer Check ................... 7-6
A3 Source and All Phase Lock Check ............ 7-8
YO Coil Drive Check with Analog Bus ............ 7-11
YO Coil Drive Check with Oscilloscope ...........
7-12
Al2 Reference Check .................... 7-13
Analog Bus Method ....................
7-13
Oscilloscope Method ....................
7-15
1OOkHzPulses ......................
7-16
PLREF Waveforms .....................
7-17
REFSiiAtAllTP9. .................
7-17
HighBandREFSii ..................
7-17
LowBandREFSiial ..................
7-18
FNLOatA12Check. ...................
7-19
4 MHz Reference Signal ..................
7-20
2ND LO Waveforms ....................
7-21
90 Degree Phase Offset of 2nd LO Signals in High Band . .
7-21
InPhase2ndLOSignalsinLowBand ...........
7-21
Al2 Digital Control Siials Check ..............
7-23
LENREFLine ......................
7-23
LHBandLLBLines. ..................
7-24
A13/A14 Fractional-N Check .................
7-24
Fractional-N Check with Analog Bus ............
7-24
Al4 VCO Range Check with Oscilloscope ..........
7-25
Al4 VCO Exercise .....................
7-27
Al4 Divide-by-N Circuit Check ...............
7-29
A14-to-Al3 Digital Control Siials Check. ..........
7-29
HMBLine
.......................
7-31
A7 Pulse Generator Check ..................
7-32
A7 Pulse Generator Check with Spectrum Analyzer .....
7-32
Rechecking the A13/A14 Fractional-N ............
7-33
A7 Pulse Generator Check with Oscilloscope .........
7-34
All Phase Lock Check ....................
7-35
Contents-8