— 26 —
3. The base and handset cannot be connected.
Check whether the base is
able to set in the test
mode 1.
Check IC18 and its
peripheral circuit.
Check base RF unit.
Check whether there is a
250 Hz data waveform at
Pin 9 of J1.
Check base RF unit.
Check RT2, R22, R56, R57
R58, R59 and C18.
Set the base in the test
mode 8, 902.979122 MHz
(250 Hz ±7 kHz Dev.) 1 mV
output signal from RF jack
is applied.
Can the INTCOM LED be
lighted?
NG
OK
NG
OK
Check the TX POWER and
the TX FREQUENCY on
the base unit.
NG
Set the base in the test
mode 3, check whether
deviation of the TX data is
app. 7 kHz Dev.
NG
OK
OK
OK
Check whether there is a
250 Hz data waveform at
Pin 1 of J1.
NG
Check base RF unit.
NG
OK
Check whether there is a
250 Hz data waveform at
the Q2 collector.
Check RT1, Q2 and their
peripheral circuits.
NG
OK
Check whether there is a
250 Hz data waveform at
Pin 11 of IC18.
Check Q5, Q6 and their
peripheral circuits.
NG
OK
Check IC18 and its
peripheral circuit.
Check IC603 and its
peripheral circuit.
Check whether the
handset is able to set in the
test mode 1.
NG
OK
Check the TX POWER and
the TX FREQUENCY on
the handset unit.
Check handset RF unit.
NG
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 ...