Panasonic KX-TCD951GB / KX-TCD955GC Service Manual ▷ View online
49
KX-TCD951GB/KX-TCD955GC
BASE UNIT: DOES NOT CHARGE.
200 mA
ammeter
ammeter
J6
J7
3 size "AA"
NiCd batteries
connected in series
NiCd batteries
connected in series
Connect the AC adaptor.
Is a voltage of 8V or more
supplied between J2 pins
6 and 5?
supplied between J2 pins
6 and 5?
Is a charging current of approx.
80 mA flowing while the tool
shown in Fig. 31 is connected?
80 mA flowing while the tool
shown in Fig. 31 is connected?
Check T16, R64, D11, R65, R66
and D12.
and D12.
Check for defects in the batteries.
Check the extent to which the
handset is charged.
Check the extent to which the
handset is charged.
Does the charge LED light
(while the tool shown in Fig. 31
is connected)?
(while the tool shown in Fig. 31
is connected)?
Check R61, T14,
D13 and R58
D13 and R58
Check R63, J4, J3 and D13
Is the voltage on the T15
Base < 1 V?
Base < 1 V?
Check the AC adaptor.
No
No
Yes
No
Yes
Fig. 31
Yes
No
Yes
A
50
KX-TCD951GB/KX-TCD955GC
HANDSET: DOES NOT CHARGE.
Check the charging pins for dirt and a
defective contact.
defective contact.
Check for a defective contact between
the charging pins and handset PCB,
and between the battery terminals and
handset PCB.
the charging pins and handset PCB,
and between the battery terminals and
handset PCB.
Check L1, L2, D1, D2, D3, T1, D7, F1
and the surrounding area.
and the surrounding area.
Check for a defective contact between
the batteries and handset.
the batteries and handset.
NO VOICE RECEPTION.
Yes
No
No
Yes
No
No
Check T8 and the surrounding
area of the base unit.
area of the base unit.
Check jumpers JMP5, JMP8,
R422, R519, JMP19, JMP20,
JMP22, D8 and the surrounding
area on the base unit.
R422, R519, JMP19, JMP20,
JMP22, D8 and the surrounding
area on the base unit.
Do waveforms
appear at IC101
pin 58?
appear at IC101
pin 58?
Do signal waveforms appear at
the TP50 on the base unit?
the TP50 on the base unit?
Do waveforms appear at the
TP123 (TxAF) in the base unit?
TP123 (TxAF) in the base unit?
Supply a signal tone from the
base unit line simulator.
base unit line simulator.
(Judged to be some form
of problem in the base unit.)
of problem in the base unit.)
Check IC1 and the surrounding
area on the handset.
area on the handset.
Check whether the SP cord on
the handset is broken.
the handset is broken.
(Judged to be some form of
problem in the handset.)
problem in the handset.)
Yes
No
Check if data
appears at IC101
pin 22 (Tx-DATA) ?
appears at IC101
pin 22 (Tx-DATA) ?
Check C111, R110
and the surrounding
area.
and the surrounding
area.
Check IC1 and the
surrounding area.
surrounding area.
51
KX-TCD951GB/KX-TCD955GC
NO VOICE TRANSMISSION.
No
No
Check jumpers JMP5, JMP8,
R422, R519, JMP19, JMP20,
JMP22, D8 and the surrounding
area in the base unit.
R422, R519, JMP19, JMP20,
JMP22, D8 and the surrounding
area in the base unit.
Check T8 and the surrounding
area of the base unit.
area of the base unit.
Do signal waveforms appear at
TP50 of the base unit?
TP50 of the base unit?
Check IC101 and the
surrounding area.
surrounding area.
Check the soldering of
IC101, RFM1 and
the surrounding area.
IC101, RFM1 and
the surrounding area.
Check T13 and the surrounding
area of the base unit.
area of the base unit.
Do signal waveforms appear at
the T13 emitter of the base unit?
the T13 emitter of the base unit?
(Judged to be some kind
of problem in the base unit.)
of problem in the base unit.)
Does data appear at IC101
pin 20? (Rx-DATA)
pin 20? (Rx-DATA)
Do waveforms appear at IC101
pin 63 of the base unit? (RxAF)
pin 63 of the base unit? (RxAF)
Check IC2 pin 60, 61, 63, 64
and the surrounding area.
and the surrounding area.
Supply 5 mV signals to the microphone
of the handset, and set to the
communication mode.
of the handset, and set to the
communication mode.
Check the microphone and
surrounding area on the
handset.
surrounding area on the
handset.
(Judged to be some kind of
problem in the handset.)
problem in the handset.)
Yes
Yes
Yes
Yes
No
No
52
KX-TCD951GB/KX-TCD955GC
BASE UNIT: DOES NOT LINK.
Yes
Yes
No
No
NG
Yes
No
No
Yes
No
Yes
3
Check the soldering of IC101,
X101 and the surrounding area
of the base unit.
X101 and the surrounding area
of the base unit.
Check the soldering of IC101,
X101 and the surrounding area
of the base unit.
X101 and the surrounding area
of the base unit.
Does the signal output from IC101
pin 1 of the base unit have a
frequency of 3.456 MHz ±14 Hz?
pin 1 of the base unit have a
frequency of 3.456 MHz ±14 Hz?
Check T8, T9, IC101 pin 39 and
the surrounding area.
the surrounding area.
Check the soldering of RFM1
and the surrounding area.
and the surrounding area.
Yes
Conduct an evaluation test on the
RF unit of the base unit
(follow check procedure A). OK?
RF unit of the base unit
(follow check procedure A). OK?
Is the clock frequency at IC101
pin 1 of the base unit 3.456 MHz?
pin 1 of the base unit 3.456 MHz?
Are clock waveforms output to
IC101 pin 1 of the base unit?
IC101 pin 1 of the base unit?
Is the link first established but then
lost immediately afterwards when
the line is connected to the base
unit and the talk button on the
handset is pressed?
lost immediately afterwards when
the line is connected to the base
unit and the talk button on the
handset is pressed?
Is a voltage of approx. 3.3V
supplied to IC101 of the base
unit?
supplied to IC101 of the base
unit?
Does the paging symbol on the
handset LED flash and a beep
sound when the page button is
pressed?
handset LED flash and a beep
sound when the page button is
pressed?
No
Check around IC7, IC6, and
T17.
Check the AC adaptor.
T17.
Check the AC adaptor.
Adjust the clock frequency
so that frequency is 3.456 MHz
±14 Hz.
so that frequency is 3.456 MHz
±14 Hz.
Handset:
Does not link.
Does not link.
OK
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