Hytera PD78XG Service Manual

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

Hytera PD78XG Specifications

General

Brand	Hytera
Model	PD78XG
Category	Portable Radio
Language	English