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PNVservice manual download site
2. After startup, the power indicator light is shining is out of repair PNVservice manual download site
This phenomenon shows that power supply circuit can normal boot and + 5 v voltage to work the system control circuit in an instant. Also shows that in addition to the + 5 v voltage power supply circuit, the other one or a few road all the way power due to their own fault or severe load short circuit output is not normal, and cause a protective stop. PNVservice manual download site
When repair, should check each output voltage is normal. Due to instantaneous protection cannot be measured, can get first and then quickly specific electrical switches, open to use power supply protection shutdown a brief interval, measuring various voltage in turn. According to the experience of maintenance, trouble-free various voltage in boot instantaneous has a short rise - down process; And faulty circuit, voltage will always be zero or minimal rise - fallen. When caught by measuring the output circuit is not normal, all the way to the output side forward reverse check (point by point measuring instantaneous voltage or the road resistance), usually can quickly find the point of failure or fault element, the most common is the related circuit inductance element bolt, capacitor leakage, voltage adjusting pipe or transistor damage control. PNVservice manual download site
In the actual circuit, the most prone to failure is + 18 v, and three way - 8 v + 9 v working voltage is not normal. The part of the common faults of the circuit is Q1004 interelectrode breakdown or open circuit; T1001 internal wire break or short circuit burned; + 18 v circuit C1013, C1016, C1017, C1019, C1020 leakage and L1009, L1010 L1011, etc. PNVservice manual download site
In addition to the above, if discover one or a few road all the way deviated from its normal value, the output voltage can be adjusted by the respective feedback sampling fine-tuning resistance VR1001, VR1002 and VR1003 to correction. PNVservice manual download site
3. The maintenance of the battery is not durable PNVservice manual download site
Batteries in the battery is not durable refers to the case, the cameras have a circuit fault caused by the battery use time is too short. This fault there are generally two kinds of phenomena: one is fault machine use ac adapter, battery is more than ten minutes deficiency of automatic alarm and shutdown. The second is to fully charged battery into the fault machine, only the power of the two instructions, and four grid in normal machine instructions. There are mainly two reasons for this failure caused: (1) the power supply circuit itself is faulty; (2) the system control circuit in the battery voltage detection circuit is defective. In addition, when the battery itself because of improper use memory effect or excessive discharge of damage, also can appear the phenomenon. Therefore, maintenance, should first confirm the battery itself are in good condition.
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