Hytera RD985 - Baseband Section: Troubleshooting Flow Chart; Interface Definition: RX-Baseband Connection

Service Manual
77
6.7 Troubleshoot ow Chart ing Fl
Control circuit check
Normal power-on and
indication?[1]
Check whether RF Power
supply circuit (U603,
U604 and U 605) and
control circuit work
normally?
LCD and LED work
normally?
3V3D is normal?
Replace LCD and
.LED
Check
U601 and U609
Reset
Check U611
Check U610
Yes
No
Yes
No
Yes
Yes
No
Yes
No
No
No
1
o
9.2MHz crystal
scillator works
normally? [3]
1V6D
Is normal?
1V8D
is normal?
The control circuit
works normally.
Is RF circuit driven
normally ?[2]
Yes
No
End
Yes
escription of Normal Situations:
] The repeater shows normal power-on screen, and the backlight is normal.
] The RF power supply outputs normally, and the RX channel is on.
] Vpp: 700mV~800mV, F: 19.2MHz.
D
[1
[2
[3