Hytera HD705 - Page 402

UHF5 (806-941MHz) Information Service Manual
392
No power output
Power supply
works normally?[1]
Check the power
supply circuit.
No
APC-OUT is
normal?[2]
TX 5V voltage
is normal?[5]
APC-IN is
normal?[3]
Yes
No
PS-APC 3.3V
is normal?[4]
Yes
PS-TX and RT5V
are normal?[5]
No
Yes
No
Match circuit is
normal?[8]
Yes
Yes
No
Q9004 works
normally?[9]
Yes
Repair damaged
components.
Power is normal? Completed
YesNo
No
Replace Q9004
and bias resistor.
Power is normal? Completed
Yes
Q9005 works
normally?[10]
D9002,spring plate for
antenna and the low-pass
filter are normal?[7]
Repair damaged
components.
Yes
No
Power is normal?
Completed
Yes
No
No
Yes
Replace Q9005
and bias resistor.
U107 works
normally?[11]
Power is normal? Completed
YesNoYes
No
Replace U107
and bias resistor.
Power is normal? Completed
YesNo
No
Q9011/U1004
works normally?[12]
Replace
Q9011/U1004 and
bias resistor.
Power is normal? Completed
YesNo
Check the output circuit of
FGU.
No
Yes
Replace Q9020 and
U9002.
Power is
normal?[6]
Completed
Yes
No
Yes
Check the DAC
output circuit.
Yes
Replace Q9008
and Q9006.
Check the power
supply circuit.
No
No