artisan 8640B - Page 16

TM 9-4935-601-14-7&P
ILLUSTRATIONS (Continued)
Figure Page
8-75 Modulation/Metering Mother Board Schematic Diagram................. 8-69
8-76 A1 Output Level Assembly Illustrated Parts Breakdown.................. 8-71
8-77 A8 Counter/Lock Assembly Illustrated Parts Breakdown................. 8-73
8-78 A9 Peak Deviation and Range Switch Assembly
Illustrated Parts Breakdown ...................................................... 8-75
8-79 A11 Variable-Frequency Modulation Oscillator (Option
991) Illustrated Parts Breakdown .............................................. 8-75
8-80 A10 Divider/Filter Assembly Illustrated Parts
Breakdown ............................................................................... 8-77
8-81 A26 AM/AGC and RF Amplifier Illustrated Parts
Breakdown ............................................................................... 8-79
8-82 Top Internal Views (Option 001 shown) ......................................... 8-81
8-83 Rear Panel View ........................................................................... 8-83
8-84 Bottom Internal Views (Option 001 shown) .................................... 8-83
SERVICE SHEETS
Number Page
1 Overall Block Diagram .................................................................. 8-18
2 FM Circuits and RF Oscillator Troubleshooting .............................. 8-20
3 AM/AGC Circuits and Output Amplifier Troubleshooting................. 8-22
4 Counter/Lock Circuits Troubleshooting .......................................... 8-24
5 RF Oscillator (A3) .......................................................................... 8-26
6 FM Amplifiers (A3, A5, A9, A13) ................................................... 8-28
7 FM Shaping Circuits and Phase Lock Loop Filter
(A7, A9) .................................................................................... 8-30
8 Over-Deviation Detector and Meter Control Circuits
(A6, A7, A9)............................................................................... 8-32
9 Fixed-Frequency Modulation Oscillator (All, A13) .......................... 8-34
9A Variable-Frequency Modulation Oscillator for Option
001 (A11, A13) ......................................................................... 8-36
10 RF Filters (A10Al) ......................................................................... 8-38
11 RF Dividers (A10A2) ..................................................................... 8-40
12 AGC Amplifiers and Amplitude Modulator (A26A3,
A26A4)...................................................................................... 8-42
13 RF Amplifier, Pulse Switching, and Step Attenuator
(A1, A26A1, A26A2) ................................................................. 8-44
14 AM Preamplifier (A13, A26A2) ...................................................... 8-46
15 AM Interconnections and RF ON/OFF Switch (A9, A26) ................ 8-48
16 RF Vernier (A1A1, A26) ................................................................ 8-50
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