— 27 —
Set the handset in the test
mode 3, check whether
deviation of the TX data is
app. 7 kHz Dev.
Set the handset in the test
mode 6, 927.000602 MHz
(250 Hz ±7 kHz Dev.) 1mV
output signal from RF jack
is applied. Check whether
the bell ring.
NG
Check whether there is a
250Hz data waveform at
Pin 9 of J601.
NG
Check VR601, R619, R632,
R634, R635, R636
and C611.
OK
Check handset RF unit.
Check whether the 250 Hz
data wareform from Pin 1
of J601 is fed.
Place the handset on the
base to charge about
5 seconds, then connect
again.
NG
Check handset RF unit.
NG
OK
Check whether there is a
250 Hz data waveform at
the Q601 collector.
OK
Check VR602, Q601 and
their peripheral circuits.
NG
OK
Check whether there is a
250 Hz data waveform at
Pin 55 of IC603.
Check Q602, Q604 and
their peripheral circuits.
NG
OK
Check IC603 and its
peripheral circuit.
OK
Содержание FT-8258
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Jun 1998 FILE NO 2B0 9801 FT 8258 CORDLESS TELEPHONE ...
Страница 10: ...BLOCK DIAGRAMS Handset Main 9 ...
Страница 11: ...Handset RF 10 ...
Страница 12: ...Base RF 11 ...
Страница 13: ...Base Main 12 13 ...
Страница 14: ... 14 15 SCHEMATIC DIAGRAMS ...
Страница 15: ... 16 17 Base RF ...
Страница 16: ...Base Key 18 19 ...
Страница 17: ... 20 21 Handset Main ...
Страница 18: ... 22 23 Handset RF ...
Страница 37: ...ELECTRICAL PARTS LOCATIONS Base Main 42 ...
Страница 38: ...Base RF 43 ...
Страница 39: ...Base Key 44 ...
Страница 40: ...Handset Main 45 ...
Страница 41: ...Handset RF 46 ...
Страница 42: ...WIRING DIAGRAMS Base 47 ...
Страница 43: ...Handset 48 ...
Страница 75: ...MECHANICAL PARTS LIST ...