Hytera PD502, Руководство по обслуживанию, Страница: 34 / 136

VHF (136-174 MHz) Troubleshooting Flow Chart
28
No power
output
Power supply works
normally?[1]
Check the power
supply circuit
No
VGG is
normal?[2]
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes
No
No
Yes
Repair damaged
components
Yes
No
Completed
Yes
No
No
Yes
Yes No Yes
No
Power is normal?
Yes No
No
Yes No
Yes
No
Check DAC
output circuit
Replace Q7009
and Q7010
Yes
Completed
Completed
Completed
Completed
Completed
Power is normal?
Power is normal?
Power is normal?
Repair damaged
components
Power is normal?
TV/APC
is normal?[3]
Check the power
supply circuit
TX_En
is normal?[5]
TX_En 3.3V
is normal?[4]
Replace Q7001
and U7001
Power is normal?[6]
Match circuit is
normal?[8]
Replace Q7003 and
bias resistor
Replace Q7002 and
bias resistor
Replace Q7004 and
bias resistor
5VA_TX 3.3V
is normal?[5]
D7001, spring plate for
antenna and low-pass filter
are normal?[7]
Q7003 works
normally?[9]
Q7002 works
normally?[10]
Q7004 works
normally?[11]
Check the output
circuit of FGU
Description of Normal Situations:
[1] Voltage of the power supply: about 7.4 V.