Maintenance Instructions; Introduction; Cleaning And Lubrication; Troubleshooting - Ten-Tec RX-340 Technical Manual

Hf dsp receiver

Table of Contents

may result if personnel fail to observe safety precautions.

Learn the areas containing high voltage within the equipment.

Be careful not to contact high voltage connections when installing, operating or

Before touching or working inside the equipment,

turn power and ground points of high potential OFF.

6-1 INTRODUCTION: To perform maintenance tasks, the technician shall identify

faulty modules or subassemblies. The faulty module or subassembly shall be replaced

with a known good one.

6-2 CLEANING AND LUBRICATION: Panel surfaces and display windows may be

cleaned using a soft damp cloth and a mild detergent solution. Never use caustic cleaners

on knobs or panel surfaces. The RX-340 has no lubrication points.

6-3 TROUBLESHOOTING: Troubleshooting consists of identifying faulty modules

or subassemblies by running the BITE tests. Level 2 and 3 BITE tests list symptoms and

the probable module or modules associated with the fault.

6-4 INSPECTION: Mechanical switches, optical interruptors, and potentiometers

should be checked periodically for signs of wear or intermittent operation. Connectors

should be inspected for damage whenever the unit is removed.

6-5 PERFORMANCE VERIFICATION TEST FOR MODEL RX-340: The

following verification tests may be performed if there is a suspected failure. Perform

each check in the order listed, as previous checks may contain setup procedures required

for succeeding tests.

6-5.1 TEST EQUIPMENT REQUIRED:

Signal generator, HP8656A or equivalent.

Signal generator, HP8640B or equivalent (16 MHz phase noise less than -130 dBc

@ 10 kHz offset), or 16.208 MHz crystal oscillator with +15 dBm output level.

RF Two-Tone test setup consisting of generators above, hybrid combiner (Anzac

HH- 107 or equivalent), and fabricated lowpass filters, amplifiers and pads to

provide two 0-dBm tones at 16.208 and 16.308 MHz and at 16.208 and 16.2085

MHz with all intermodulation and harmonic outputs less than -80 dBm.

Audio analyzer, HP8903B or equivalent: AC Level, SINAD, and %THD

capabilities.

Audio spectrum analyzer, HP141T/8852B/8553B or equivalent.

Step attenuator, 10 - dB steps, 0-120 dB, HP355B or equivalent.

Step attenuator, 1 - dB steps, 0-12 dB, HP355C or equivalent,

Directional coupler, 20 dB, Anzac CD-920-4 or equivalent.

Computer terminal with RS-232 interface, Wyse 50, DEC VT-100, or equivalent.

CHAPTER 6