Panasonic KX-TG8551UAB / KX-TG8561UAB / KX-TG8561UAR / KX-TGA855RUB / KX-TGA855RUR Service Manual ▷ View online
45
KX-TG8551UAB/KX-TG8561UAB/KX-TG8561UARKX-TGA855RUB/KX-TGA855RUR
(F)* Battery Monitor Check
-
1. Apply 2.25 V between BATT+ and BATT-.
2. Execute the command
2. Execute the command
sendchar PAD
sendchar LED 0
sendchar CRX 0 1
sendchar AD1
It assumes that the return value is XX.
a) XX: 70: No need to adjust
b) XX: 66 ~ 6F: Need to adjust
XX: 71 ~ 7A: Need to adjust
Write AD value of 2.25 V to EEPROM.
ex) read data: XX = 6A, write data: YY = 6A
read data: XX = 73, write data: YY = 73
EEPROM = 0009(Low Voltage) write “YY”
Execute the command “wreeprom 00 09 01 YY”.
EEPROM = 000A(No Voltage) write “YY -C"
Execute the command “wreeprom 00 0A 01 ZZ”.
for model with Power Failure Talk, add:
sendchar LED 0
sendchar CRX 0 1
sendchar AD1
It assumes that the return value is XX.
a) XX: 70: No need to adjust
b) XX: 66 ~ 6F: Need to adjust
XX: 71 ~ 7A: Need to adjust
Write AD value of 2.25 V to EEPROM.
ex) read data: XX = 6A, write data: YY = 6A
read data: XX = 73, write data: YY = 73
EEPROM = 0009(Low Voltage) write “YY”
Execute the command “wreeprom 00 09 01 YY”.
EEPROM = 000A(No Voltage) write “YY -C"
Execute the command “wreeprom 00 0A 01 ZZ”.
for model with Power Failure Talk, add:
EEPROM = 000B (Low Voltage for PSPLY)
Write YY + A
Execute the command "wreeprom 00 0B 01 XX".
Write YY + A
Execute the command "wreeprom 00 0B 01 XX".
Note:
XX = YY + A
ZZ = YY - C
ZZ = YY - C
c) XX: 00 ~ 65: Reject
XX: 7B ~ FF: Reject
XX: 7B ~ FF: Reject
IC1, F1, R45
(G)
Battery Low
Confirmation
-
1. Apply 2.40 V between BATT+ and BATT-.
2. Confirm that there is no flashing of Battery Icon.
3. Apply 2.25 V ± 0.08 V between BATT+ and BATT-.
4. Confirm that there is flashing of Battery Icon.
2. Confirm that there is no flashing of Battery Icon.
3. Apply 2.25 V ± 0.08 V between BATT+ and BATT-.
4. Confirm that there is flashing of Battery Icon.
IC1, F1, R45
(H)* BBIC Clock Adjustment
CKM
1. Apply 2.6 V between BATT+ and BATT- with DC power.
2. Input Command “sendchar sfr”, then you can confirm the current value.
3. Check X’tal Frequency. (10.368 MHz ± 100 Hz).
4. If the frequency is not 10.368 MHz ± 100 Hz, adjust the frequency of CKM
2. Input Command “sendchar sfr”, then you can confirm the current value.
3. Check X’tal Frequency. (10.368 MHz ± 100 Hz).
4. If the frequency is not 10.368 MHz ± 100 Hz, adjust the frequency of CKM
executing the command “sendchar sfr xx xx (where xx is the value)” so that the
reading of the frequency counter is 10.368000 MHz ± 5 Hz.
reading of the frequency counter is 10.368000 MHz ± 5 Hz.
Note:
Clear the registered information for Base Unit before measurement, because the
Frequency will not possibly get stable due to the registered information.
Pressing the button of "3" "5" "7" "#"clears the registration.
Register to it on Base Unit after measurement.
Frequency will not possibly get stable due to the registered information.
Pressing the button of "3" "5" "7" "#"clears the registration.
Register to it on Base Unit after measurement.
IC1, X1, C47
(I)*
Transmitted Power
Confirmation
-
Short Antenna pattern to GND.
1. Configure the DECT tester (CMD60) as follows;
<Setting>
• Test mode: PP
• RFPI: 0102030405
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• RF LEVEL = -70 dBm
• PACKET: PP32Z
• RFPI: 0102030405
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• RF LEVEL = -70 dBm
• PACKET: PP32Z
2. Execute the command “sendchar TST 01 02 03 04 05".
3. Initiate connection from DECT tester.
4. Confirm that the NTP value at ANT is 19 dBm ~ 25 dBm.
3. Initiate connection from DECT tester.
4. Confirm that the NTP value at ANT is 19 dBm ~ 25 dBm.
IC1,
C802~C806,
C809~C814,
C820, C822,
C809~C814,
C820, C822,
C823,
C825~C826,
L802, L803,
DA801, R806,
R807
(J)* Modulation Check and
Adjustment
-
Follow steps 1 to 3 of (I).
4.Confirm that the B-Field Modulation is -350 ± 50/+350 ± 50 kHz/div using data
type Fig 31.
type Fig 31.
Refer to (I)
(K)*
Frequency Offset
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that the frequency Offset is < ± 20 kHz.
Refer to (I)
(L)*
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.
Refer to (I)
(M)*
Power RAMP
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that Power RAMP is matching.
Refer to (I)
Items
Check
Point
Procedure
Check or
Replace Parts
46
KX-TG8551UAB/KX-TG8561UAB/KX-TG8561UARKX-TGA855RUB/KX-TGA855RUR
(N)
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 Handset. Measure the Level at Line I/F
and distortion level.
4. Confirm that the level is -1.0 dBm ± 5 dB 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 -27.5 dBm ± 4 dB and that the distortion level is < 5 %
at Receiver (34
Ω Load).
IC1, C12, C96,
C97, R5, R27,
RA4, C11,
C13, R28,
MIC, R23,
C13, R28,
MIC, R23,
C42, C70, C71
(O) 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 -6.0 dBm ± 3 dB and that the distortion level is < 5 %.
(vol = Max at SP (8
Ω Load))
IC1, D13, D14,
C72, C73,
C98, C99,
C78, C79,
C98, C99,
C78, C79,
R76, R77
(P)
Charge Pump 3.0 V
Supply Confirmation
CP3V
1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0 V ± 0.3 V. C30, C53, C54
(Q) Charge Pump CP_LED
4.0V Supply
Confirmation
CP_LED
1. Confirm that the voltage between testpoint CP_LED and GND is 4.0 V ± 0.3 V.
(Power is supplied when LED in on)
C52, C55
(R)
Charge Pump CP2.8V
Supply Confirmation
CP2.8V
1. Confirm that the voltage between testpoint CPV2.8V and GND is 2.8V ± 0.3 V.
C30, C53,
C54, D3, C51
(S)
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 -9.0 dBm ± 3 dB 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 dB and that the distortion level is < 5 %
at Headset Receiver (150
Ω Load).
IC1, R29, C37,
R22, C14,
R25, C16,
R25, C16,
C83, R80, L7,
L9, C87, C84,
L9, C87, C84,
CN4, C80,
C82, C39, L10,
L8
Items
Check
Point
Procedure
Check or
Replace Parts
47
KX-TG8551UAB/KX-TG8561UAB/KX-TG8561UARKX-TGA855RUB/KX-TGA855RUR
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 (*1)
* Do not enter New Data if the Default Data is different from the table above.
Note
(*1) Refer to Handset (P.22) of Engineering Mode to enter the Address or New Data.
Model
Content
Address
Default Data
New Data
TGA855
TX 6dB Louder
02 EC
02 ED
02 ED
02 E8
02 E9
02 E9
02 EA
02 EB
02 EB
F5
32
32
FC
5F
01
00
01
00
8A
19
FC
5F
02
00
02
00
TX 12dB Louder
02 EC
02 ED
02 ED
02 E8
02 E9
02 E9
02 EA
02 EB
02 EB
F5
32
32
FC
5F
01
00
01
00
CC
CC
CC
FC
5F
03
00
03
00
TX 6dB Lower
02 EC
02 ED
02 ED
02 E8
02 E9
02 E9
02 EA
02 EB
02 EB
F5
32
32
FC
5F
01
00
01
00
AC
65
FC
5F
00
00
00
00
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KX-TG8551UAB/KX-TG8561UAB/KX-TG8561UARKX-TGA855RUB/KX-TGA855RUR
10 Disassembly and Assembly Instructions
10.1. Disassembly Instructions
10.1.1. Base Unit
10.1.1.1. KX-TG8551
Ԙ
Remove the 4 screws to remove
the cabinet cover.
the cabinet cover.
ԙ
Remove the solders then remove the P.C.Board.
4 screws
Solders
Cabinet
cover
cover
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