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8.2 FAULT FINDING
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8.2 FAULT FINDING
In case of semiconductor circuits, it is deemed that there are 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 checking, note that there is some dispersion in the fusing characteristics.
Table 8-12 shows a list of fuses used in the equipment.
Table 8-12 Fuse List
Location Parts No. Current Rating Protection Circuit Type
Display Unit F2 5A/10A Processing unit assembly Refer to table 8-13
Display Unit F3 12A/10A Processing unit assembly Refer to table 8-13
LOG.NSK circuit F1 to F4 0.5A LOG.NSK circuit PC4201 MF51NR-0.5A
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