2. Service
Assembly/Module Diagnostic Trees (Diagnostic Section 3)
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Assembly/Module Diagnostic Trees
(Diagnostic Section 3)
This section provides diagnostic trees for individual assemblies and modules.
Assembly and tree numbers in bold designate the trees that are actually
present in this section. The following assemblies and modules are covered or
are referenced to other sections/diagnostic trees:
A1 Motherboard (See section 2, Power-supply diagnostic tree.)
A2 CBT Controller assembly, tree 1: 3.1.1.1.0
A3 Microprocessor assembly (See section 1, Top-level diagnostic tree.)
A4 Digital Synthesizer (See A5 or section 2, RF-chain diagnostic tree.)
A5 87 MHz PLL module, tree 2: 3.2.1.0
A6 Servo (See section 2, Analog signal-chain diagnostic tree.)
A7 Interface assembly (See A2 diagnostic tree.)
A8 1 PPS module, tree 3: 3.3.0
A9 Frequency Multiplier module, tree 4: 3.4.1.0
A10 Output Frequency Distribution Amplifier module,
tree 5: 3.5.1.0
A11 Power-steering logic (See section 2, Power-supply diagnostic tree.)
A12 Dc-Dc Converter module (See section 2, Power-supply tree.)
A13 Front-panel assembly (See section 1, Top-level diagnostic tree.)
A14 Signal Amplifier module (See section 2, RF-chain diagnostic tree.)
A15 9.2 GHz Microwave Generator module, tree 6: 3.6.1.0
A16 High-Voltage Supply module, tree 7: 3.7.1.0
A17 Cesium-beam tube (See section 1, Top-level tree.)
A18 9.2 GHz PLL module, tree 8: 3.8.1.0
A19 Reference Oscillator (Quartz) module, tree 9: 3.9.1.1
Assembly/Module (A/M) Procedure Numbering System
The assembly/module diagnostic tree step numbers identify the
assembly or module tree under consideration (within this section, 3)
by the second digit from the left of a particular procedural step, for
instance: step 3.4.1.1 is the second procedure for A9.
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