8.2 TROUBLESHOOTING
In case of semiconductor circuits, it is deemed that there is few cases in which the used
semiconductor devices have inferior quality or performance deterioration except due to
insufficient design or inspection or by other external and artificial causes. In general, the
relatively many causes are disconnection in a high-value resistor due to moisture, a defective
variable resistor and poor contact of a switch or relay.
Some troubles are caused by defective parts, imperfect adjustment (such as tuning
adjustment) or insufficient service (such as poor cable contact). It will also be effective to
check and readjust these points.
Melted fuses are caused by any clear cause. When a fuse is replaced, it is necessary to
check the
related circuits even if there is no trouble. In this case, note that there is some dispersion in
the fusing characteristics. Table 8.7 shows a list of fuses used in the equipment.
Table 8.7 Fuse List
Location Parts No.
Nominal
Protection Circuit Type
Current
Transmitter-
F1 1A Rectifier circuit PC1001 MF51NN-1A
receiver Unit
Display Unit
F1 to F4 0.5A LOG.NSK circuit PC4201 MF60NR-0.5A
(NSK)
8 – 16
8
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