18
3. The base and handset cannot be connected.
Set the base in the test
mode 8, 902.952467 MHz
(250 Hz ±8 kHz Dev.) 1mV
output signal from RF jack
is applied. Does the bell
ring?
OK
Check the TX POWER and
the TX FREQUENCY on
the base unit.
OK
OK
Check whether the base is
able to set in the test mode
1.
NG
Check whether there is a
250Hz data waveform at
C232.
NG
Check base RF unit.
NG
Check IC22 and its peripheral
circuit.
Check base RF unit.
Set the base in the test
mode 3, check whether
deviation of the TX data is
app. 8 kHz Dev.
Check RT3, C234, R58 and
C232.
NG
Check base RF unit.
Check whether there is a
250 Hz data waveform at
pin 9 of IC1.
NG
Check RT2, Q6 and their
peripheral circuit.
Check whether there is a
250 Hz data waveform at
the Q6 collector.
NG
Check whether there is a
250Hz data waveform at pin
39 of IC22.
NG
Check IC18 and its
peripheral circuit.
Check IC22 and its
peripheral circuit.
Check IC603 and its
peripheral circuit.
Check whether the handset
is able to set in the test
mode 1.
NG
Check handset RF unit.
Check the TX POWER and
the TX FREQUENCY on
the handset unit.
NG
OK
NG
OK
OK
OK
OK
OK
OK
A
Summary of Contents for FT-8859
Page 2: ...CORDLESS TELEPHONE SERVICE MANUAL FILE NO 2B0 9907 FT 8859 PUBLISHED IN JAPAN Oct 1999 ...
Page 11: ...9 BLOCK DIAGRAMS Base Unit ...
Page 12: ...10 Handset Unit ...
Page 13: ...11 12 SCHEMATIC DIAGRAMS Base Unit Main ...
Page 15: ...14 15 Handset ...
Page 30: ...30 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 31: ...31 Base Unit Key PCB ...
Page 32: ...32 Handset Main PCB ...
Page 33: ...33 34 WIRING DIAGRAMS Base Unit ...
Page 34: ...35 Handset ...
Page 57: ......
