15
KX-TS620BX1
8.1.1.
Check Power
Cross Reference:
Note:
BBIC is IC901.
(*1) Refer to “SPECIFICATIONS” on the cover page for part
number and supply voltage of AC adaptor.
8.1.2.
Check Bell Detection
Note:
BBIC is IC901.
Is the AC
a
d
a
ptor inserted into AC outlet ? (*1)
Is the volt
a
ge of test point DC1
ab
out 6.5V ?
Check AC
a
d
a
ptor.
YE
S
YE
S
YE
S
YE
S
YE
S
YE
S
YE
S
YE
S
Is the volt
a
ge of test point TP303
ab
out 4V ?
Is the volt
a
ge of test point TP304
ab
out 4V ?
Is the volt
a
ge of test point (TP301)
ab
out 3.2V ?
Is the volt
a
ge of test point (TP302)
ab
out 1.
8
V ?
Is the volt
a
ge of BBIC(57) low ?
Is the volt
a
ge of test point (TP905) high ?
NO
Does BBIC(21) oscill
a
te
a
t 10.36
8
MHz ?
Check IC303, R301, Q301, R307, C309.
Check IC903, C901, D901.
Check X900, C910, C911.
Check BBIC
NO
NO
NO
NO
NO
NO
NO
Check
Power
S
upply Circuit.
YE
S
YE
S
YE
S
YE
S
YE
S
NO
NO
NO
NO
NO
( Input
b
ell sign
a
l from LINE )
Is there
b
ell sign
a
l
a
t IC1 (
8
) ?
Check
a
round R1, C1, D1~D6, C2, IC1,
sm
a
ll PCB connection with LED
8
04.
Is BBIC (63)
b
ecome low when
b
ell sign
a
l
comes in ?
Check
a
round C4, R6, PC1.
Is there
b
ell ringing sign
a
l
a
t test point
TP902?
Check BBIC.
Is IC904 (1) input volt
a
ge high ?
Check IC905, BBIC.
Is there
b
ell ringing sign
a
l
a
t IC904 (5,
8
) ?
Check
a
round R924, R925, C926~C930.
Check spe
a
ker
a
nd C925.
