3. The base and handset cannot connect.
NGNG
Check whether theBy using voltage chart,
Check the base TX power.
handset and the base unitcheck the base TX circuit.
are connected.
OK
NG
Check the base TX dataCheck R53, R74, R71,
deviation.R75 and R76.
NG
Check the handset RXCheck the handset RX RF
sensitivity.and mixer circuit (Q501) as
well as FT501 and FT503.
OK
Check the handset RXNGCheck R505, C511 and
data pulse wave formingC539.
current (Pin 15 of IC503).
OK
Check R515.
NG
Check the handset TXBy using voltage chart,
POWER.check the handset TX
circuit.
OK
Check the handset dataNGCheck the handset MICNGCheck the handset TX AF
deviation.sensitivity.circuit (around Pins 17,
19 ~ 21 of IC504).
OKOK
Check the handset data
circuit (R540, R541, R584,
and R587).
Check the base RXNGCheck the base RX TELNG
In the base, with the SG
sensitivity.OUT.
standard modulation of
1kHz 3kHz deviation and
OK
input signal of 1mV, can
the sine wave be seen at
Check the base RX RF and
Pin 25 of IC1?
mixer circuit (around Q1)
as well as FT3 and FT2.
OKNG
Check the base IF circuit
(around Pins 26~29 of IC1).
Then, can the sine wave
NG
be seen at Pin 24 of IC1? -
OK
? 15 ? |
ACEC
