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4. TROUBLE SHOOTING
4.16 PTT Trouble
CIRCUIT DIAGRAM
Checking Flow
START
Connection
between FPCB and
CN601 is OK?
Yes
SPKP_LDO_EN signal is
High?
Yes
SPK_P_SM signal is
High?
Yes
AMP_SD signal
is High?
Yes
PTT is Operated!!
2V8_VEXT
C223
U204
0.1u
NLAST4599DFT2
R226
NO
6
5 COM
R228
NC 4
SPK_RADIO_SEL
No
Reconnect FPCB to CN601
AMP_SD signal
No
is Low?
Yes
Soldering between
cable and board is OK?
Yes
Cables of Receiver
are OK?
Yes
Only receiver is Operated
- 88 -
0
RADIO_SPK_R
NA
REC_P
No
Resolder the Cable
No
Change the Receiver
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