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3. The base and handset cannot be connected.
Check whether the base is
able to set in the test
mode 1.
OK
Check the TX POWER and
the TX FREQUENCY on
the base unit.
OK
Set the base in the test
mode 3, check whether
deviation of the TX data is
app. 7 kHz Dev.
OK
Set the base in the test
mode 8, 902.984676 MHz
(250 Hz ±7 kHz Dev.) 1 mV
output signal from RF jack
is applied.
Can the INUSE LED be
lighted?
OK
Check whether the
handset is able to set in the
test mode 1.
OK
Check the TX POWER and
the TX FREQUENCY on
the handset unit.
OK
NG
Check IC5 and its
peripheral circuit.
NG
Check base RF unit.
NG
Check whether there is a
250 Hz data waveform at
pin 9 of J1.
Check base RF unit.
NG
Check whether there is a
250 Hz data waveform at
pin 1 of J1.
Check whether there is a
250 Hz data waveform at
the Q1 collector.
Check whether there is a
250 Hz data waveform at
pin 37 of IC5.
Check IC5 and its
peripheral circuit.
NG
Check IC603 and its
peripheral circuit.
NG
Check handset RF unit.
NG
OK
NG
OK
NG
OK
NG
OK
Check RT2, R30, R31, R32
R33, R57 and C28.
Check base RF unit.
Check RT1, Q1 and their
peripheral circuits.
Check Q3, Q4 and their
peripheral circuits.
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