Panasonic KX-TG8621UAM / KX-TGA860RUM Service Manual ▷ View online
37
KX-TG8621UAM/KX-TGA860RUM
Cross Reference:
Schematic Diagram (Handset) (P.70)
Note:
(*2) After replacing, need to adjust the frequency of BT.
Refer to Things to Do after Replacing IC or X'tal (P.56)
Refer to Things to Do after Replacing IC or X'tal (P.56)
Check the circuit of around
POWER and RESET parts
of BT Module.
POWER and RESET parts
of BT Module.
Check the circuit of around
UART communication (*1) of
main board and BT module.
UART communication (*1) of
main board and BT module.
AC power on
PIO01
㻍
1.4sec
1.4sec
㻍
2.8sec
2.8sec
㻍0.06sec
㻍3.6sec
Case1: OK
Case2: NG1(fail to reset BT_IC)
AC power on
PIO01
㻍
1.4sec
1.4sec
If BT_IC does not work, 1st and 2nd signals does not
appear.
Case3: NG2 (fail to receive of UART signals)
AC power on
PIO01
㻍
1.4sec
1.4sec
If BT_IC fails to receive of UART, 2nd signal does not turn
to HIGH.
to HIGH.
Case4: NG3 (fail to transmit of UART signals)
AC power on
㻍
1.4sec
1.4sec
If BT_IC fails to transmit of UART, 2nd signal does not turn
to LOW.
to LOW.
PIO01
Replace BT module (*2)
still NG
...
38
KX-TG8621UAM/KX-TGA860RUM
9.2.
Troubleshooting by Symptom (Base Unit and Charger Unit)
If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not.
(*1) or not.
Note:
(*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic
level in detail.
(*2) Refer to Check Point (Base Unit) (P.38)
level in detail.
(*2) Refer to Check Point (Base Unit) (P.38)
9.2.1.
Check Point (Base Unit)
Please follow the items below when BBIC or EEPROM or FLASH is replaced.
Note:
After the measuring, suck up the solder of TP.
*: The Setting Method of JIG (Base Unit) (P.48) is required beforehand.
The connections of simulator equipment are as shown in Adjustment Standard (Base Unit) (P.50).
*: The Setting Method of JIG (Base Unit) (P.48) is required beforehand.
The connections of simulator equipment are as shown in Adjustment Standard (Base Unit) (P.50).
You have DECT Tester.
(Model Number : CMD60)
Check item (A)-(I),(T).
Check item (A)-(I), (J)-(P),(T).
Check item (A)-(G),(Q),(T).
Check item (A)-(G), (J)-(P), (Q),(T).
-
Check item (J)-(P).
Check item (Q).
Check item (Q).
Check item (Q).
Check item (Q).
Check item (A)-(I), (S).
Check item (A)-(P), (S).
You cannot dial.
You cannot hear the caller's voice.
You cannot use handset a little away from base unit
even if the handset is within range of the base unit.
even if the handset is within range of the base unit.
The acoustic transmit level is high or low.
The acoustic reception level is high or low.
Base unit and handset do not link each other.
The unit cannot charge.
Check item (T).
Check item (R).
Check item (T).
Check item (R).
TAM does not work.
Remedy (*2)
Symptom
You don't have DECT Tester.
Items
Check
Point
Procedure
Check or
Replace Parts
(A)
2.85 V Supply
Confirmation
VDD3
1. Confirm that the voltage between test point VDD3 and GND is 2.85 V ± 0.2 V. IC2, C32, C36,
C86, R91, R93,
L3, C602, C38,
R605, R607,
R608, R612,
R609, R610,
R608, R612,
R609, R610,
Q602
(B)
1.8 V Supply
Confirmation
Confirmation
VDD1
1. Confirm that the voltage between test point VDD1 and GND is 1.8 V ± 0.02 V.
2. Execute the command “VDD”, then check the current value.
3. Adjust the 1.8V voltage of VDD1 executing command “VDD XX“(XX is the
2. Execute the command “VDD”, then check the current value.
3. Adjust the 1.8V voltage of VDD1 executing command “VDD XX“(XX is the
value).
Q8, C75, C614,
C61, IC7, R611
(C) Charge Pump 3.0V
Supply Confirmation
VDD5
1. Confirm that the voltage between test point VDD5 and GND is 3.0 V -0.1/+0.3
V.
IC7, C625
(D) Charge Pump 3.0V
Supply Confirmation
VDD4
1. Confirm that the voltage between test point VDD4 and GND is 3.0 V ± 0.2 V. IC7, C616, R620
(E)*
BBIC Confirmation
-
1. BBIC Confirmation (Execute the command “getchk”).
2. Confirm the returned checksum value.
2. Confirm the returned checksum value.
Connection of checksum value and program number is shown below.
IC7, X1, R77,
RA80
(F)* EEPROM Confirmation
-
1. EEP-ROM Confirmation (Execute the command "sendchar EPV").
2. Confirm the returned Value. (Value for reference is written at "EEPROM C/
2. Confirm the returned Value. (Value for reference is written at "EEPROM C/
SUM” in Software_Version_Table.xls).
IC7, RA402,
C51, R657,
IC401
(G)* BBIC Clock Adjustment
CLK
1. Confirm that the voltage between testpoint VDD4 and GND is less than 1.0 V.
2. Input Command “sendchar sfr”, then you can confirm the current value.
3. Check X’tal Frequency. (10.368 MHz ± 20 Hz).
4. If the frequency is not 10.368MHz ± 20 Hz, adjust the frequency of CLK
2. Input Command “sendchar sfr”, then you can confirm the current value.
3. Check X’tal Frequency. (10.368 MHz ± 20 Hz).
4. If the frequency is not 10.368MHz ± 20 Hz, adjust the frequency of CLK
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.
the reading of the frequency counter is 10.368000 MHz ± 5 Hz.
X1, IC7, R430,
C305
checksum value
444F
program number
DCR1EN
ex.)
39
KX-TG8621UAM/KX-TGA860RUM
(H)* Hookswitch Check with
DC Characteristics
-
1. Connect Telephone Socket to Tel-simulator which is connected with 600
.
2. Set line voltage to 48 V and line current to 40mA at off-hook condition of
normal telephone.
3. Execute the command “hookoff”
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command “hookon”.
6. Confirm that the line current is less than + 0.8 mA.
4. Confirm that the line current is 40 mA ± 5 mA.
5. Execute the command “hookon”.
6. Confirm that the line current is less than + 0.8 mA.
P1, Q3, R14,
R15, Q4, R16,
R17, D3,
R18~R24, D21,
Q5, R27, IC7
(I) DTMF Generator Check
-
1. Connect Telephone Socket to DTMF tester. (Load=600
)
2. Link Handset and push dial key.
3. Confirm DTMF character.
4. Confirm that the high Group is -3.0 ± 2.0 dBm.
5. Confirm that the low Group is -6.0 ± 2.0 dBm.
3. Confirm DTMF character.
4. Confirm that the high Group is -3.0 ± 2.0 dBm.
5. Confirm that the low Group is -6.0 ± 2.0 dBm.
IC7, R116, R29,
C22, Q5, D21
(J)*
Transmitted Power
Confirmation
-
ANTI_TP
Remove the Antenna before starting step from 1 to 7.
1. Configure the DECT tester (CMD60) as follows;
<Setting>
• Test mode: FP
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• PMID: 00000
• RF LEVEL = -70 dBm.
• Traffic Carrier: 5
• Traffic Slot: 4
• Mode: Loopback
• PMID: 00000
• RF LEVEL = -70 dBm.
2. Execute the command ”sendchar TST”.
3. Execute the command “sendchar dmv 2 2”.
4. Check that “Signalling Status” has been set to “Locked”, then press “ACCEPT
3. Execute the command “sendchar dmv 2 2”.
4. Check that “Signalling Status” has been set to “Locked”, then press “ACCEPT
RFPI”.
5. Initiate connection from Dect tester (“set up connect”)
6. Execute the command “ANT1”.
7. Confirm that the NTP value at ANT is 19.0 dBm ~ 25.0 dBm.
6. Execute the command “ANT1”.
7. Confirm that the NTP value at ANT is 19.0 dBm ~ 25.0 dBm.
IC7,
C802~C806,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
DA801, DA802,
L802~L803,
C855~C858,
R806~R807,
R106, R109,
R806~R807,
R106, R109,
Q9, C617, R71
(K)* Modulation Check and
Adjustment
-
ANTI_TP
Follow steps 1 to 6 of (J).
7.Confirm that the B-Field Modulation is -350±50/+350±50 kHz/div using data
type Fig31.
type Fig31.
IC7,
C802~C806,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
DA801, DA802,
L802~L803,
C855~C858,
R806~R807,
R106, R109,
R806~R807,
R106, R109,
Q9, C617, R71
(L)* Frequency Offset Check
-
ANTI_TP
Follow steps 1 to 6 of (J).
7.Confirm that the frequency offset is < ± 20 kHz.
IC7,
C802~C806,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
DA801, DA802,
L802~L803,
C855~C858,
R806~R807,
R106, R109,
R806~R807,
R106, R109,
Q9, C617, R71
(N)*
Sensitivity Receiver
Confirmation
-
ANTI_TP
Follow steps 1 to 6 of (J).
7.Set DECT tester power to -88 dBm.
8.Confirm that the BER is < 1000 ppm.
8.Confirm that the BER is < 1000 ppm.
IC7,
C802~C806,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
DA801, DA802,
L802~L803,
C855~C858,
R806~R807,
R106, R109,
R806~R807,
R106, R109,
Q9, C617, R71
Items
Check
Point
Procedure
Check or
Replace Parts
40
KX-TG8621UAM/KX-TGA860RUM
9.2.2.
Check Point (Charger Unit)
Note:
After the measuring, suck up the solder of TP.
The connection of adjustment equipment is as shown in Adjustment Standard (Charger Unit) (P.51).
The connection of adjustment equipment is as shown in Adjustment Standard (Charger Unit) (P.51).
(P)*
Power RAMP
Confirmation
-
Follow steps 1 to 6 of (J).
7.Confirm that Power RAMP is matching.
IC7,
C802~C806,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
C809, C813,
C820, C822,
C823, C825,
C826, C851,
C853, C837,
C863, C864,
DA801, DA802,
L802~L803,
C855~C858,
R806~R807,
R106, R109,
R806~R807,
R106, R109,
Q9, C617, R71
(Q)
Audio Check
-
1. Link with Handset 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
)/1kHz to MIC of Handset. Measure the Level at Line I/F
and distortion level.
4. Confirm that the level is -2.2 dBm ± 5 dBm and that the distortion level is <5 %
at TEL Line (600
Load).
5. Input -20 dBm(600
)/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 -30.4 dBm ± 4 dBm and that the distortion level is <5
% at Receiver (34
Load).
IC7, SA1, P1,
D3, Q3, Q4,
R14, R15, R16,
R17, D21, Q5,
R19, R20, C14,
C56, R117,
R116, R29, C22
(R)
TAM Operation
Confirmation
-
1. TAM Confirmation (Execute the command "sendchar VPI").
2. Confirm the returned Value.
2. Confirm the returned Value.
ex). "DCF7RN 00"
IC7, IC421,
R424~R429,
C421, C422,
C421, C422,
Q421
(S)
2.4V Supply
Confirmation VDD2
VDD2
1. Confirm that the voltage between test point VDD2 and GND is 2.5 V ± 0.2 V.
IC7, Q9, C617,
R71
Items
Check
Point
Procedure
Check or
Replace Parts
(T)
Charging Check
-
1. Connect Charge Contact 12
/2 W resistor between charge+ and charge-.
2. Measure and confirm voltage across the resistor is 3.5 V ± 0.3 V.
R1, F1
Items
Check
Point
Procedure
Check or
Replace Parts
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