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5. Loosen both tuning-shaft retainer nuts (one located behind tuning knob, the other
located behind tuning-shaft encoding wheel).
6. Retighten tuning-shaft retainer nuts fmger tight only.
'CAUTION
Overtightening tuning-shaft retainer nuts may cause damage to
tuning assembly and the A9 module.
7. Reinstall tuning knob and flywheel and retighten screws.
8. Check for smooth, free operation of tuning knob.
9. Reinstall the receiver front panel as directed in Paragraph 5.7, Receiver Assembly and
Disassembly.
10. Reinstall receiver top and bottom covers and retighten six
(6)
quarter-turn fasteners.
1'1. Reconnect power source.
5.3
MAINTENANCE SUPPORT EQUIPMENT
Certain procedures involved with both performance testing and board-level fault isolation
may require the use of external test equipment to supplement BITE. Table 5-2 lists suggested test
equipment by type and required operational characteristics. Not all test equipment listed is required
for anyone procedure. Equipment required for a particular test
~s
specified in the procedure for
that test.
TABLE 5-2. MAINTENANCE SUPPORT EQUIPMENT
Recommended Instru-
Instrument
Specifications
ment or Equivalent
Digital Multimeter
Range: 0 to 150 Vac and dc
Fluke 8000A-O 1
o
to 1 A ac and dc
Display: 3Y2 digits
Accuracy: ±L.S. digit
Oscilloscope, Dual Trace
Sensitivity : 5 mV/div.
Tektronix 465B
Frequency: dc to 2 MHz
Oscilloscope, Probe
-
Tektronix P61 05X
1
0
RF Voltmeter
Range: 300 mV to 3 Vrms
Boonton 92-B
Frequency: 100 kHz to 70 MHz
Input Impedance:
>
1 M ohm with 50 ohm
adapter
Distortion Analyzer
Distortion Levels: 0.1 to 100%
Hewlett-Packard 331 A
Frequency: 5 Hz to 600 kHz
Voltage Range: 300 uV to 300 Vrms
Voltage Accuracy: ±2% up to 300 kHz
5-3
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