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373XXA MM 5-25
TROUBLESHOOTING SIGNAL PATHS
YIG Oscillator
X4
(SQM)
Reverse
Switched Filter
Down
Converter
Analog to Digital Converter
A5 PCB
Sampler/BufferAmp
X2
(SDM)
X4
(SQM)
Forward
MUX Coupler
(reverse)
Transfer Switch
(Test A/ Test B
control)
37 GHz
HiPass Filter
37 GHz
HiPass Filter
Step
Attenuator
**
Bias Tee
**
MUX Coupler
(Forward)
A6 PCB
TestBIF
SPDT Switch
J4
J5
Test B
Test A 38-65 GHz
Test B 38-65 GHz
Test A
A3 PCB
Test AIF
Power Amp
Second LO
(A2 PCB)
First LO
(A1 PCB)
Test B 40MHz - 38GHz
Test A 40MHz - 38GHz
Front
Panel
Access
Loop**
40MHz - 65GHz (Test B)
40MHz - 65GHz (Test A)
J3
2.5 MHz CW
J2J2
Test B 38 -65
GHz
Test A
38-65
GHz
J2
J1
J4J2
J3
J2
DCV
J1
J3
J2
40MHz-
2GHz
6.3-
8.3GHz
2-20GHz
40MHz-
19GHz
9.5-
16.25GHz
40MHz-38GHz
J3
Port 2
Coupler
Device
Under
Test
(DUT)
Port 1
Coupler
Bias Tee
**
Rear
Panel
Access
Loop **
J4
J4 J5 J2 J3
J4
J3
J2 J7
DC voltages
DC voltages
2.5 MHz CW
Step
Attenuator
**
Coupled
Arm
Coupled
Arm
Digital Data to
Processor
J3
J2
J3
J2
J1
Test B Test A
16.8 GHz
Lowpass
Filter
15 dB
Pad
NOTE: Sampler/Buffer amplifiers are individually matched to
Power Amplifiers. If either fails, both should be replaced with
another matched set, part number ND53249.
** Indicates not
p
resent on model 37297B or 37277B
Figure 5-3. 37397A Test Signal Path Diagram