2. Service
Functional-Group-Diagnostic Trees (Diagnostic Section 2)
66
Functional-Group-Diagnostic Trees
(Diagnostic Section 2)
This section provides functional-group-level diagnostic trees for the 5071A
Primary Frequency Standard.
Functional-group diagnostic trees necessarily evaluate two or more
assemblies/modules when such operation is interactive. The cumulative
operation of the constituent parts is analyzed as a whole.
When possible, an assembly or module is isolated to fault-status within the
functional-group diagnostic tree. At other times, the functional-group tree
points to individual assembly/module diagnostic trees located in section 3.
The names of the functional-groups are listed below in order with the
assemblies and modules that comprise them:
1 Power-supply diagnostic tree: 2.1.1.1.0
A1 motherboard assembly
A11 Power steering logic assembly
A12 Dc-to-Dc Converter module
LF1 Line filter module/cable assembly
T1 Toroidal power transformer
B1 24V Internal-Standby Battery. (Does not apply for Opt. 048).
2 Analog-signal chain diagnostic tree: 2.2.1.0
A6 Servo assembly
A14 Signal amplifier module
3 RF-chain diagnostic tree: 2.3.1.0
A4 Digital Synthesizer assembly
A5 87 MHz PLL module
A9 Frequency multiplier module
A10 Output frequency distribution amplifier module
A15 9.2 GHz microwave module
A18 9.2 GHz PLL module
A19 Reference oscillator module
4 C-field diagnostic tree: 2.4.1.0
A7 Interface assembly
A17 Cesium-beam tube assembly
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