Toshiba FT-3808BK, Service Manual

Page: 19 / 60

17
3. The Base and handset can’t connect.
NG NG
OK
NG
OK OK
NG
OK
NG
OK
NG
NG
OK
NG NG
OK
OK
NG NG
OK
Check whether the
handset and the base
unit are connected.
Check whether the handset
and the base RX, TX-Loop-
are OK.
By using voltmeter, check the base &
handset PLL circuit (B/HU2 and
surrounding circuit of B/HU2)
Check the base TX Power
Check the base TX data
deviation
Check the handset RX
Sensitivity
Check RX data pulse wave
on RX-DATA
By using voltmeter, Check
the handset TX circuit (HQ1
and HQ13).
At the PIN24 of HU3, Can
the pulse wave be seen.
Check the base RX TEL
OUT.
Check the handset data
circuit (around HU5C)
Check the base RX RF and
mixer circuit (around BQ7).
Check the handset
TX power.
Check the handset
data deviation.
Check the base RX
Sensitivity
By using voltmeter, check
the base TX circuit.
By using voltmeter, check
BU5 and BU6
Check the handset RX RF
circuit (HU1) as well as
HQ2 and HQ4.
Check HU5C and
surrounding circuit of HU5
Check HU3 circuit.
Alignment the BC151 and
by using voltmeter, check
BU1