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CHAPTER 13. TROUBLE SHOOTING
13-1 OVERVIEW
Cause of TROUBLE in equipment, similar to mechanic cause and electronic cause appeared
in external and inner of Equipment. These can be block by periodic check. This function has
various protecting circuit for trouble of external or inner and blocking damage of circuit
and part. However, in case of having trouble and damage, users have to find out problem.
i.e., user should recognize first whether badness of equipment-self or external problem. To
hold the performance of the initial equipment and the life, it needs regular checking and
wrong checking and wrong repair can reduce the performance and life. Therefore, users
should know following contents for right checking and repair.
13-2 MEASUREING INTRUMENT
These equipment products for international radio telephone rule. Maintenance &
adjustment of this equipment have to control from correcting test center by rated testers
must have testers for maintenance & adjustment daily as follow.
1. Multi-tester for check that don't need to be deliciated ohm, Voltage, current.
2. TEST PROBE that can be change from high-frequency signal to direct current.
3. High-frequency transit power supply that can be check of traveling wave of until
1.605MHz
～
27.499MHz band max 150W
～
500W
4. 100MHz band max 150W, dummy load of 50
Ω
5. Frequency counter that can be check 100MHz band
6. OSCILLOSCOPE that can be check 100MHz band
7. Other testers
13-3 MAINTENANCE OF SRG-150DN/250DN
1. Antenna
When error of communication happens in installation and usage in terms of receiving
sensitivity and noise, you need to check if there is a faulty of Antenna
a) Check that antenna control to vertical bearings (WHIP ANTENNA) correctly?
b) Check if metal objects are near the antenna?
c) Is it O.K connect condition & insulation of antenna and connecting parts between
transmitter receiver.
