— 17 —
A
Check handset RF unit.
Set the handset in the
test mode 3, check
whether deviation of the
TX data is app. 9.0 kHz
Dev.
NG
Check whether there is a
250 Hz data waveform at
"MOD" of RF unit.
Check R635, R636, R634,
R632, R619, C610, C611,
C669 and RT603.
NG
OK
Check handset RF unit.
NG
Set the handset in the
test mode 6, 926.997467
MHz (250 Hz –8 kHz
Dev.) 1mV output signal
from RF test point is
applied. Check whether
the bell ring.
NG
Check whether the 250
Hz data waveform from
pin 9 of IC606 is fed.
Check IC606, Q612 and
their peripheral circuit.
NG
OK
OK
Check whether there is a
250 Hz data waveform at
the Q601 collector.
Check RT602, Q601 and
their peripheral circuit.
NG
OK
Check whether there is a
250 Hz data waveform at
pin 55 of IC603.
Check R618, R621,
IC601 and their
peripheral circuit.
NG
OK
Check IC603 and its
peripheral circuit.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
OK
Summary of Contents for FT-8981
Page 1: ...SERVICE MANUAL PUBLISHED IN JAPAN May 2001 FILE NO 2B0 200104 FT 8981 CORDLESS TELEPHONE ...
Page 9: ... 8 BLOCK DIAGRAMS Base Unit ...
Page 10: ... 9 Handset ...
Page 12: ...Handset 12 13 FT8981 Sche p65 01 05 25 13 21 Page 9 Adobe PageMaker 6 5J Win ...
Page 27: ... 28 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 28: ... 29 Handset Main PCB ...
Page 29: ... 30 WIRING DIAGRAMS Base Unit ...
Page 30: ... 31 Handset ...
