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hc7service manual download site
The maintenance, you should measure the main circuit board power socket P10012 feet or test point TL1011 about whether the voltage in 12 v. Voltage is the point at which a battery or adapter to the power supply voltage inside the machine, if no voltage point, should check the camera at the bottom right power socket small L1601, whether D1603 open welding circuit board component, connector P1501 and P1602 is bad contact, whether contact inside the adapter dc input jack is not good. hc7service manual download site
hc7service manual download site
If the above test point when the voltage is normal, should continue to measure IC1001 attending, 3501. The GIF (121 bytes) feet for 12 v voltage, without L1001 disconnection or desoldering, if there can be side electrical switches to boot, edge measuring power on-off control tube Q1006 base into a low level, such as Q1006 base level remains unchanged, should inspect system control circuit in the circuit or component; If Q1006 the base level change is normal, then continue to measure Q1006 collector for 12 v dc voltage output and taken to a IC1001 around 3502 GIF (117 bytes), if the voltage is no, then Q1006 a fault and its bias resistors. hc7service manual download site
When the 12 v voltage can be normal to IC1001 circuit, but each is still no output voltage, should be focusing on IC1001 oscillation circuit is normal, also is to use oscilloscope to detect IC10013503. GIF (118 bytes) feet have normal oscillation waveform, if you have normal waveform, can be decided oscillation circuit in good condition; If no waveform, should check whether the capacitance C1027 is damaged. In addition, to detect IC10013504. GIF (121 bytes) feet if there is a system control circuit is about 4.8 V from high level. If everything is all right, but still can't work, circuit can be concluded that IC1001 damage, replaceable IC1001 try. hc7service manual download site
If doubt is IC1001 damage in the maintenance, can also be measured by its various pin to ground resistance and working voltage (compared to the normal) to judge. The prajnaparamita IC1001 damage, its pin resistance there will always be a few obvious deviation from normal.
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