Hytera PD415 - Transmitter Circuit

Troubleshooting Flow Chart
UHF1 (400‐470 MHz)
20
6.3 Transmitter Circuit
Caution
The following tests must be performed under the 7.4 V power supply.
No Power
Output
Power supply
is normal?[1]
Check power supply
circuit
No
VGG is normal?[2]
TV/APC is
normal?[3]
Yes
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
YesNo
No
Replace Q803 and
bias resistor
Yes
Repair the
damaged parts
Yes
No
Yes
No
No
Yes
YesNoYes
No
YesNo
No
Check U701 circuit
Completed
Yes
No
Yes
Check the power
supply of TX_En
TX_En is normal?[4]
No
Check DAC
output circuit
Check 5VRT
Yes
Check the output
circuit of FGU circuit
TX_En is
normal?[4]
5V_TX_RF is
normal?[5]
Power is
normal?[6]
Completed
Completed
Completed
Completed
Completed
Power is normal?
Power is normal?
Power is normal?
Power is normal?
Repair the
damaged parts
Power is normal?
Replace Q802 and
bias resistor
Replace Q804 and
bias resistor
D801 and low-pass
circuit are
normal?[7]
Matching circuit is
normal?[8]
Q803 is normal?[9]
Q802 is normal?[10]
Q804 is normal?[11]