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3. The base and handset cannot be connected.
Check whether the base
is able to set in the test
mode 8.
OK
Check the TX POWER
and the TX FREQUENCY
on the base unit.
OK
Set the base in the test
mode 10, check
whether deviation of the
TX data is app. 9.0 kHz
Dev.
OK
Set the base in the test
mode 13,
902.952467MHz
(250 Hz –8 kHz Dev.)
1mV output signal from
RF test point is
a p p l i e d .
D o e s t h e
CHARGE LED light?
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
A
NG
Check IC4 and its
peripheral circuit.
NG
Check base RF unit.
NG
Check whether there is a
250 Hz data waveform at
MOD of RF unit.
OK
Check base RF unit.
NG
Check whether there is a
250 Hz data waveform at
RT2 AF test point.
OK
Check whether there is a
250 Hz data waveform at
the Q2 collector.
OK
Check whether there is a
250 Hz data waveform at
pin 64 of IC4.
OK
Check IC4 and its
peripheral circuit.
NG
Check IC603 and its
peripheral circuit.
NG
Check handset RF unit.
NG
Check RT3, R76, R91,
R49, C129, C122,
C33 and C52.
NG
Check IC3, Q1 and their
peripheral circuit.
OK
NG
Check RT2, Q2 and their
peripheral circuit.
NG
Check R27, R171, R172,
IC1 and their peripheral
circuit.
— 16 —
NG
Check base RF unit.
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