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COMMON FAULT TROUBLE SHOOTING
Check IC351
No
or IC251 of
Logic Circuit
OSC171
No
TCXO is
dead
No
IC121 is dead
OSC121 or
No
IC121 is dead
NEC Confidential & Proprietary
1. RX PORTION
RX level
OK?
No RX
Check
V_RF,V_OSC,
V_L01,V_L02
=2.7V ?
Yes
Check IC121
#38 26MHz
clock
Yes
Check IC121
#36 13MHz
clock
Yes
Check
OSC121 #4
frequency
Yes
IC121 is dead
or check
Logic Circuit
Bad RX
Low
Check U101
#3,#4,#5 level
Normal
Check
Low
BPF221 #1,
BPF211 #2,
BPF201 #2 level
Normal
Check BPF201 #4,
Low
#6,BPF211
#4,#6,BPF221
#3,HYB221 #2
level
Normal
Low
Check IC121
#4,#5,#7,#8,
#10,#11 level
Normal
Replace IC121
Replace U101 or
check ANT circuit
Replace C201,
C202,C211,
C212,C221 or
C222
Replace
BPF201,
BPF211, BPF221,
C223 or C228
Replace
C205,C206,L213,
L212,HYB221,
L226,L227,C229
or C230
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