Hytera PD415 - FGU Circuit

Troubleshooting Flow Chart
UHF1 (400
‐
470 MHz)
22
6.4 FGU Circuit
Check FGU circuit
Check the
power supply
circuit
Does VCO oscillate?
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
No
Yes
No
No
No
No
Completed
Yes
No
No
Yes
5VFGU, VCC_VCO,
3V3_FGU and
3V3A_FGU_PLL are
normal?
No
Q1002, Q1004, Q1005,
Q1011 and Q901 are
normal?[1]
Q1001 and Q1010 are
normal?[2]
Replace Q1001
and Q1010
Check Q1001, Q1010
and peripheral
components
CV is normal?[3]
Replace Q1002,
Q1004, Q1005,
Q1011 and Q901
Replace L1006
and L1017
L1006 and L1017
are normal?[4]
Replace Q1006
and Q1007
Q1006 and Q1007
are normal?[5]
Does 19.2 MHz
crystal oscillate?
Check 19.2 MHz
circuit
Does feedback circuit
output?
Check feedback circuit
Check Q1006, Q1007
and peripheral
components
Signal amplitude is
normal?[7][8]
Check data control circuit
of SKY72310
Clock of SKY72310 is
normal?[6]
Check data control
circuit of SKY72310