Panasonic KX-TG8081RUB / KX-TGA806RUB Service Manual ▷ View online
41
KX-TG8081RUB/KX-TGA806RUB
(L)*
Frequency Drift
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that the frequency Drift is < ± 20 kHz/msec.
IC1,
C802~C806,
C809~C814,
C820, C822,
C809~C814,
C820, C822,
C823,
C825~C826,
L802, C863,
C864, L803,
C864, L803,
DA801, R806,
R807
(M)*
Sensitivity Receiver
Confirmation
-
Follow steps 1 to 3 of (I).
4.Set DECT tester power to -88 dBm.
5.Confirm that the BER is < 1000 ppm.
5.Confirm that the BER is < 1000 ppm.
IC1,
C802~C806,
C809~C814,
C820, C822,
C809~C814,
C820, C822,
C823,
C825~C826,
L802, C863,
C864, L803,
C864, L803,
DA801, R806,
R807
(N)*
Power RAMP
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that Power RAMP is matching.
IC1,
C802~C806,
C809~C814,
C820, C822,
C809~C814,
C820, C822,
C823,
C825~C826,
L802, C863,
C864, L803,
C864, L803,
DA801, R806,
R807
(O)
Audio Check and
Confirmation
-
1. Link to BASE which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50mA.
3. Input -45 dBm (600
2. Set line voltage to 48 V and line current to 50mA.
3. Input -45 dBm (600
Ω)/1 kHz to MIC of Handset. Measure the Level at Line I/F
and distortion level.
4. Confirm that the level is -2.0 dBm and that the distortion level is <5 % at TEL
Line (600
Ω Load).
5. Input -20 dBm (600
Ω)/1 kHz to Line I/F. Measure the Level at Receiver of
Handset and distortion level (Receive volume set to second position from
minimum).
minimum).
6. Confirm that the level is -24 dBm and that the distortion level is <5 % at
Receiver (34
Ω Load).
IC1, C12, C96,
C97, R215,
R27, RA4,
C11, C13,
R28, MIC
(P) SP phone Audio Check
and Confirmation
-
1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -30 dBm(600
2. Set line voltage to 48 V and line current to 50 mA.
3. Set the handset off-hook using SP-Phone key.
4. Input -30 dBm(600
Ω)/1 KHz to Line I/F and measure Receiving level at SP+
and SP-.
5. Confirm that the level is -8 dBm and that the distortion level is < 5 %.
(Val = Max at SP (8
Ω Load))
IC1, C12, C73,
D13, D14,
MIC, C11,
C13, RA4,
R27, R28,
C96, C97,
C96, C97,
R215, C72,
C73
(Q)
Charge Pump 3.0V
Supply Confirmation
CP3.0V
1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0 V ± 0.3 V. C49, C53, C54
(R)
Charge Pump CPV2
4.0V Supply
Confirmation
CPV2
1. Confirm that the voltage between testpoint CPV2 and GND is 4.0 V ± 0.3 V.
(Power is supplied when LED in on)
C52, C55
(S)
Charge Pump CP2.8V
Supply Confirmation
CP2.8V
1. Confirm that the voltage between testpoint CPV2.8V and GND is 2.8 V ± 0.3 V.
C49, C53,
C54, D3, C51
(T)
Headset Audio Check
and Confirmation
-
1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm (600
2. Set line voltage to 48 V and line current to 50 mA.
3. Input -45 dBm (600
Ω)/1 kHz to MIC of Headset. Measure the Level at Line I/F
and distortion level.
4. Confirm that level is -7.5 dBm ± 3 dBm and that the distortion level is <5 % at
TEL Line (600
Ω Load).
5. Input -20 dBm (600
Ω)/1 KHz to Line I/F. Measure the Level at Receiver of
Headset and distortion level (Receive volume set to second position form
minimum).
minimum).
6. Confirm that the level is -21.5 dBm ± 3 dBm and that the distortion level is < 5%
at Headset Receiver (150
Ω Load).
IC1, R29, C16,
C184, R22,
C14, R25, L9,
C86, C83,
C32, R306,
L72, L74,
C185, C110,
CN4
Items
Check
Point
Procedure
Check or
Replace Parts
42
KX-TG8081RUB/KX-TGA806RUB
9.3.2.
Troubleshooting for Speakerphone
When the customer’s telephone line corresponds to the following conditions, and the transmission signal of SP-Phone is
interrupted, performing the next set up to a cordless handset will improve it to some extent.
Conditions
interrupted, performing the next set up to a cordless handset will improve it to some extent.
Conditions
1. When customer’s line has less line loss.
ex.) The customer is using optical fiber, ISDN terminal adaptor, or PBX.
In this case, receiving signal is strong and it may affect transmission signal.
In this case, receiving signal is strong and it may affect transmission signal.
2. When the other party is talking from noisy place.
ex.) The other party is using cellular phone. The background noise is very loud.
In this case, the noise from the other party (i.e. surrounding noise) may affect transmission signal.
In this case, the noise from the other party (i.e. surrounding noise) may affect transmission signal.
Setting Method
• Change the handset address of EEPROM (0129) from 00 to 01 by Engineering Mode.
43
KX-TG8081RUB/KX-TGA806RUB
10 Disassembly and Assembly Instructions
10.1. Disassembly Instructions
10.1.1. Base Unit
Ԙ
Remove the 2 screws to remove
the cabinet cover.
the cabinet cover.
ԙ
Remove the tapes and solders to remove
the main P.C. board.
the main P.C. board.
Cabinet cover
Tapes and solders
ԙ
Main P.C. board
2 Screws
Ԙ
44
KX-TG8081RUB/KX-TGA806RUB
10.1.2. Handset
Ԙ
Remove the 2 screws.
ԙ
Ԛ
Likewise, open the other
side of the cabinet.
side of the cabinet.
ԛ
Remove the cabinet cover
by pushing it upward.
Remove the EP cap.
by pushing it upward.
Remove the EP cap.
Ԝ
Remove the screw, solders and tape
to remove the main P. C. board.
to remove the main P. C. board.
Main P.C. board
Ԝ
Screw
Cabinet cover
2 screws
Ԙ
Solders and
Tape
Tape
Cabinet body
Cabinet cover
Insert a plastic card.
(Ex. Used SIM card etc.)
between the cabinet body
and the cabinet cover, then
pull it along the gap to open
the cabinet.
(Ex. Used SIM card etc.)
between the cabinet body
and the cabinet cover, then
pull it along the gap to open
the cabinet.
Ԝ
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