Hytera PD362, Service Manual

Page: 34 / 141

Ua (400
‐
440 MHz)
Troubleshooting Flow Chart
27
No
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes No
No
Yes
Yes
No
No
No
Yes
Yes No Yes
No
Completed
Yes No
No
Yes No
Yes
No
Yes
No power
output
Completed
Completed
Completed
Completed
Completed
Power supply works
normally?[1]
Check the
power supply
circuit.
VGG is
normal?[2]
APC/TV1 is
normal?[3]
Check the MCU
output circuit.
3V_TX_RF
is normal?[5]
TX_En 3.3V is
normal?[4]
TX_En is
normal?[5]
Replace Q7010
and U7001
Replace Q6008
Check the power
supply circuit.
Power level is
normal?[6]
D8021, RF connector
and the low-pass network
are normal?[7]
Match network
is normal?[8]
Q404 and Q406
work normally?[9]
Q405 works
normally?[10]
Q606 works
normally?[11]
Check the
output circuit of
FGU.
Power level is
normal?
Power level is
normal?
Power level is
normal?
Power level is
normal?
Repair damaged
components.
Repair damaged
components.
Power level is
normal?
Replace Q404, Q406
and bias resistor.
Replace Q406 and
bias resistor.
Replace Q606 and
bias resistor.
Yes
Q7004 works
normally?[12]
Yes
No
No
Yes
Completed
Power level is
normal?
Replace Q7004 and
bias resistor.
Description of Normal Situations: