Toshiba FT-3808BK, Service Manual

Page: 18 / 60

16
2. The bell does not ring & page does not ring.
NG NG
OK
NG
OK
OK NG
OK
NG
OK
NG
NG NG
OK
NG
OK
OK
NG
OK
Can the base and
handset be connected.
Check whether the base &
handset RX and TX-Loop-V
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
When the key of the
handset is pressed, can the
pulse output at PIN20 of
HU3.
At the HD6 anoe, Can the
pulse wave be seen.
Ringer is defective.
Press handset Dial Key
while in Talk Mode,
Can key touch sound be
heard from the ringer.
Check the BU3 and the
surrounding circuit of
BU3.
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
well as HQ2 and HQ4.
Check HU5C and
surrounding circuit of HU5
Check HU3 circuit.
Check HQ14, HQ17 and
HR139.
When the PAGE SW of
the base is pressed, does
PIN21 of BU3 change
from high to low.
Check the BS3, BR154 and
BR77.