NV-M8000 type machine into the battery, normal without switching on the power switch, press the box key, with the warehouse can be normal pop. By the fault phenomenon analysis, the fault is preliminarily judged in the switching power supply circuit.. Open the right side of the machine, switch on the power switch, and find the power supply circuit at the bottom right of the main PCB (VEP03582A).. With 500 million table check control pulse amplification integrated block IC1002 (UN102) pins 2 and 15 voltage UNREG12V normal and examination in 3, 5, 7, 9, 11 and 13 feet were no voltage output, it is estimated that the fault in the IC1001 (containing oscillator, benchmark voltage generator, an error amplifier and comparator circuit, etc.) or 5V voltage output circuit. Pop up battery, using a multimeter to check the IC1002 on the road to the foot is the reverse resistance, found 3, 5 foot red pen test for the 1. 2K, the black probe for measuring 200K, the normal value of positive and negative resistance is 0.3K, as shown in table 1. This shows that there is an open circuit fault for the 5V and 5 pin output IC10023 load.. The circuit is shown in Figure 1. Along the circuit examination, found that the integrated circuit protector R1049 inside the circuit has been damaged and thus causing the power switch when the 5V voltage without output, the system controls the microprocessor IC6001 do not work. The switch tube Q1001 base is in the cut-off state due to the low level control voltage delivered by the system control.. Q1001 collector without SW12V voltage output, can not provide the IC10011 pin (VCC) to provide working voltage, IC1001 does not work, IC10023, 5 no 5V voltage output, so the above failure phenomenon. After the replacement of integrated block circuit protector R1049 (VSF0015A10, the nominal surface of the device is nominal ICP-N25), the fault is excluded.
Panasonic NV-M7, NV-M10, NV-M1000 and NV-M8000 Camcorder switch power supply adopts integrated blocks BA6149LS and UN102 for power converter and control pulse amplifier. UN1023, 5 pin output 5V voltage and 9, 7 pin output 9V voltage are all series connected to an integrated circuit protector. The power switch of the power switch, the load current of 9V and 5V, the circuit of the IC protector is more common..
5V 23, 5 pin output voltage of the UN10 mainly for the system to control the microprocessor, electronic video and other circuits provide working voltage. Integrated circuit protective device R1049 internal damage of the open circuit, the system control microprocessor circuit does not work, the failure phenomenon to press the power switch power supply indicator light does not shine, an electronic search like device on the screen without gratings, according to key boxes with warehouse not bombs, machine does not work.
UN1027, 9 feet in the output voltage of 9V is mainly for the system to control the loading motor drive circuit, servo circuit and power switch pipe at the base of the Q1005 provides the bias voltage (output EVF5V searching image converter provides working voltage). Integrated circuit protector the r1350 internal open after the damage, the failure phenomenon is connected to a power switch, the power indicator light, an electronic search like device on the screen without gratings, leading the motor shaft to rotate, cut off the power supply automatically after a few seconds, re connect the power switch, machine repetition on the fault phenomenon; according to the box key, a power indicator light flashes about extinguished immediately, with warehouse bomb not, leading the motor shaft to rotate, a few seconds shutdown protection.