— 19 —
A
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
RT602.
Check R668, R712,
R713, R716, R717,
C719, C748 and RT602.
NG
OK
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 IC603 is fed.
Check IC603 and its
peripheral circuit.
NG
OK
OK
Check whether there is a
250 Hz data waveform at
Pin 10 of IC602.
Check IC602 and its
peripheral circuit.
NG
OK
Check whether there is a
250 Hz data waveform at
Pin 40 of IC608.
Check R648, R649,
IC602 and their
peripheral circuits.
NG
OK
Check IC608 and its
peripheral circuit.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
OK
Check handset RF
section.
Check handset RF
section.
Summary of Contents for FT-8901A
Page 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Oct 2001 FILE NO 2BO 200113 FT 8901A CORDLESS TELEPHONE ...
Page 9: ...BLOCK DIAGRAMS Base Unit 8 ...
Page 10: ... 9 Handset Unit ...
Page 12: ...Base Key Unit 12 13 FT8901A Sche p65 01 10 15 10 42 Page 9 Adobe PageMaker 6 5J Win ...
Page 26: ... 28 Unit V Ref No Pin STBY TALK Note Note 61 2 9 2 9 IC608 62 2 9 2 9 63 2 9 2 9 64 2 9 2 9 ...
Page 29: ... 31 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 30: ... 32 Base Unit Key PCB ...
Page 31: ... 33 Handset Unit Main PCB ...
Page 32: ... 34 WIRING DIAGRAMS Base Unit ...
Page 33: ... 35 Handset Unit ...
