— 32 —
7. The voice of the caller cannot be heard (incoming call).
Can the base and handset
be connected?
See 3. The base and
handset cannot be
connected.
NG
OK
The 1 kHz 77.5 mV sine
waveform is applied to
TEL-line of the base, can the
1 kHz sine waveform from
the Q2 collector be fed?
Check the base TEL-line
circuit and RELAY control
circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at
pin 7 of IC1.
Check IC6 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at
pin 10 of IC1.
Check IC1 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at
pin 9 of J2.
Check RT2 and its
peripheral circuit.
NG
OK
TX output signal from the
base is detected by the
liner detector, can the 1 kHz
sine waveform be fed?
NG
Check base RF unit.
OK
Check whether there is the
1 kHz sine waveform at
pin 1 of J601 on the
handset unit.
NG
Check handset RF unit.
OK
Check whether there is the
1 kHz sine waveform at
pin 5 of IC601.
NG
Check VR602, Q601 and
their peripheral circuits.
OK
Check whether there is the
1 kHz sine wave at the
pin 3 of IC601.
NG
Check IC601 and its
peripherial circuit.
OK
Check whether there is the
1 kHz sine waveform at
pin 1 of J602.
NG
Check Q603 and its
peripheral circuit.
OK
Check SP801 and WA801.
Содержание FT-8908
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Oct 1998 FILE NO 2B0 9806 FT 8908 CORDLESS TELEPHONE ...
Страница 10: ... 9 10 BLOCK DIAGRAMS Base Main ...
Страница 11: ... 11 Base RF ...
Страница 12: ... 12 Handset Main ...
Страница 13: ... 13 Handset RF ...
Страница 14: ... 14 15 SCHEMATIC DIAGRAMS Base Main ...
Страница 15: ... 16 17 Base RF ...
Страница 16: ... 18 19 Base Key ...
Страница 17: ... 20 21 Base DSP ...
Страница 18: ... 22 23 Handset Main ...
Страница 19: ... 24 25 Handset RF ...
Страница 40: ... 46 ELECTRICAL PARTS LOCATION Base Main ...
Страница 41: ... 47 Base RF ...
Страница 42: ... 48 Base Key ...
Страница 43: ... 49 Base DSP ...
Страница 44: ... 50 Handset Main ...
Страница 45: ... 51 Handset RF ...
Страница 46: ... 52 WIRING DIAGRAMS Base ...
Страница 47: ... 53 Handset W501 W 072147 J502 JK 736 9P J601 IC603 PORTABLE RF B501 PE1294DA TOP VIEW SOLDERING ...