Hytera PD415 - Receiver Circuit

Troubleshooting Flow Chart
VHF1 (136
‐
174 MHz)
18
6.2 Receiver Circuit
Input IF signal at
Z601 to test whether
IF sensitivity is
normal.[5]
No
No
Yes
Yes
Yes
Yes
No
No
No
No Receiving
No
Yes
Yes
Yes
No
No
Yes
Output of
3V3_RX_RF is
normal?[1]
Output of 3V3A_RX is
normal?[2]
Quiescent
operating point of
Q602 is normal?[3]
Output of LNA_Out
is normal?[6]
Yes
Completed
No
Check Q601
Check U306
Check Q602
Check Q604
Check
second LO
Check Q602 and RF
front-end circuit
Check RX VCO
Check Z601, Q604 and
peripheral circuits
Check signal frequency,
amplitude and modulation
information
Quiescent
operating point of
Q604 is normal?[4]
Output of LO signal
is normal?[7]
Output of first IF
signal is normal?[8]
Input signal is
normal?[9]