Troubleshooting Flow Chart - Hytera PT580 Service Manual

Troubleshooting Flow Chart

TX Circuit
No
Re-assemble the
spring plate or
replace it.
No
Replace U4103.
No
Replace U4102.
No
Replace U4002.
Check whether
T4001 and the
No
filter are
soldered
inappropriately
or damaged.
No
Check the
baseband.
Select the test mode and supply 3.7V
voltage. Then check whether the standby
Make the TX VCO locked. Then check
whether the TX VCO outputs stably
No
Check whether the spring
plate for the antenna is assembled
properly. [3]
Yes
Check whether U4103 is normal. [4]
Yes
Check whether U4102 is supplied
normally. [5]
Yes
Check whether U4002 outputs
normally. [6]
Yes
Check whether
U4001 outputs normally. [7]
Yes
Check whether the input I/Q signal for
U4001 is normal. [8]
Abnormal power output
Yes
current (240mA) is normal.
Yes
[1]
Yes
Make the TX link in
open-loop working
status.
Check whether the
open-loop transmission
is normal. [2}
is soldered inappropriately or
R4011\R4015\C3013\C4014
is soldered inappropriately or
Check whether T4002 is soldered
inappropriately or damaged.
Yes
23
Service Manual
If the current is over
No
500mA, it indicates
the PA is damaged.
Please replace the
PA (U4102).
No
Check the TX VCO.
Yes
Yes
Check whether C4139
damaged.
No
Check whether R4010\
Yes
damaged.
No
Yes
No
Completed
Replace
C4139.
Replace the
damaged
parts.
Replace the
feedback
balun.