Field anomalies mainly refers to the field is too large or too small, from the maintenance practice point of view, to negative feedback network negative feedback7UUservice manual download site
Road failure is more common: followed by sawtooth wave generator (including the supply voltage is too high or too low) and the field output circuit7UUservice manual download site
question.7UUservice manual download site
The following are the same as the "7UUservice manual download site
The maintenance can be carried out as follows:7UUservice manual download site
1) If the field potentiometer is located in the negative feedback network, adjust the field adjustment resistor, and observe the screen at the same time reflect.7UUservice manual download site
If the grating jumps, but sometimes can make the field back to normal, then the fault in the adjustable resistance. If the field can change,7UUservice manual download site
But can not return to normal, then the failure may be in the negative feedback network components have variable (quality). If the regulation does not work at all7UUservice manual download site
Use, then the negative feedback network has open circuit failure.7UUservice manual download site
2) If the field adjustment is set in the sawtooth wave forming circuit, the sawtooth wave voltage can be observed with an oscilloscope, if the integrated power7UUservice manual download site
Road without this pin, can be directly observed sawtooth signal output (ie, field output circuit signal input) sawtooth voltage amplitude7UUservice manual download site
degree. If the waveform distortion or amplitude is not enough, should check the field vibration pin external timing components and supply voltage. If there is no exception, and then check7UUservice manual download site
Sawtooth wave to form a capacitor, if it is normal, it is integrated block field oscillation circuit is bad. If the sawtooth voltage is normal (no)7UUservice manual download site
Less than 0.6Vp-p), it indicates that the fault is present in the negative feedback or the field output circuit element is defective.7UUservice manual download site
3) If the fault is present at the output stage, the field output voltage can be measured. If it is an OTL field output circuit,7UUservice manual download site
1 / 2EC. If OCL, BTL type of field output circuit, the output voltage is basically zero. If the check is so, base7UUservice manual download site
This can be used to determine the field integrated circuit and external boost components normal, should consider whether the field deflection coil has a short circuit or S correction7UUservice manual download site
Capacity (ie, output capacitor, refers to the OTL type field output circuit) is bad. If the output voltage is abnormal, then the field power circuit7UUservice manual download site
Or field push leveling work disorders. If the power supply voltage is too low, the field amplitude will be small, and the power supply or reverse power supply circuit should be checked7UUservice manual download site
BTL type circuit) components. If there is no exception, it should be considered field-integrated block internal push-pull circuit or field negative feedback circuit components7UUservice manual download site
barrier. If necessary, should be replaced by the law.7UUservice manual download site