Hytera PD362, Service Manual

Page: 32 / 141

Ua (400
‐
440 MHz)
Troubleshooting Flow Chart
25
6.2
Receiver Circuit
Check Q6005
Second LO is normal?[6]
Input IF signal via z6001 to
check whether IF sensitivity
is normal?[5]
Check U306
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No receiving
No
Yes
Yes
Check RX VCO
Yes
No
Yes
No
No
Yes
3V_RX_RF outputs
normally?[1]
The static working
point of Q6005 is
normal?[3]
Yes
Completed
No
3VRT
outputs normally?[2]
Check Q6006
Check Q611
and peripheral
components
Check X8001
and related
components
19.2 MHz is normal?[7]
The static working
point of Q6006 is
normal?[4]
LNA_Out output is
normal?[8]
Check Q6005 and
front-end RF circuit
LO signal output is
normal?[9]
RX_LO output is
normal?[10]
First IF output is
normal?[11]
Check Z6001, Q6006 and
peripheral circuit
Input signal is normal?[12]
Check signal frequency,
amplitude and modulation
information