Troubleshooting Flow Chart - RCA RDR9000 Service Manual

Service Manual

3.6 Troubleshooting Flow Chart

No
Description of Normal Situations:
1) The repeater shows normal power-on screen and the LED indication is normal.
2) The speaker can sound alert tones normally and receive audio properly.
3) Amplitude of the 19.2 MHz clock in the control section is up to 1.2Vpp.
4) The fan works normally.
Baseband check
No
Fan works normally board, fan, and power output
during power-on
process?
Yes
No
LCD, key, or
speaker is normal?
Yes
Abnormal power on?
Yes
External
Adjust the external
power supply, power supply, connect
No
antenna connection, or the
the antenna properly,
circuit for rear board fan
or check the circuit for
is normal?
the rear board fan.
Yes
Check the control
section on the main
board.
No
Normal 19.2 MHz
3V3A_RF is
clock frequency?
normal?
[3]
No
Yes
Check U1013 circuit.
No
1V2D voltage is
Check U1001 circuit.
normal?
Yes
No
1V8D and 3V3D
voltages are
normal?
Yes
No
Check circuits of
WD_RST signal at high
U2003 and U2010.
level?
Yes
No
Normal IP network Check components of PHY
connection? chip (U4010) and rear board.
Yes
Can enter the boot Reburn the program.
mode?
No
Completed
Check rear
from the RX
board.
Yes
Replace 20-pin data
20-pin data cable or
cable or LCD.
LCD is damaged?
No
5VD and 3V3D for the Yes RESET signal for
control head are the control head at
normal?
high level?
No
Check the power
OMAP_RESET signal for
supply circuit for
the control head at high
the control head.
Yes Yes
Q2002 circuit is
normal?
No
Check Q2002 circuit.
Yes
5VD voltage is Check circuits of U1002
normal?
No
Check components of
U1000 and Q1009.
19
3. Baseband Section
Yes
Replace the control
head.
No
Repair the reset
Yes
circuit for the
control head.
level?
No
Check X7000
and the filter
circuit.
and U1003.