Panasonic KX-TG8521CAB / KX-TGA850RUB Service Manual ▷ View online
41
KX-TG8521CAB/KX-TGA850RUB
(F)* Battery Monitor Check
-
1. Apply 2.35 V between BATT+ and BATT-.
2. Execute the command
2. Execute the command
sendchar VBA
It assumes that the return value is XX.
a) XX < 0A: No need to adjust
It assumes that the return value is XX.
a) XX < 0A: No need to adjust
Note:
b) XX 0A : Reject
IC1, F1, C2,
R45, C15, C80
(G)
Battery Low Confirma-
tion
-
1. Apply 2.40 V between BATT+ and BATT-.
2. Confirm that there is no flashing of Battery Icon.
3. Apply 2.35 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 2.35 V ± 0.08 V between BATT+ and BATT-.
4. Confirm that there is flashing of Battery Icon.
IC1, F1, C2,
R45, C15, C80
(H)* BBIC Clock Adjustment
CLK
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. (13.824000 MHz ± 100 Hz).
4. If the frequency is not 13.824000 MHz ± 100 Hz, adjust the frequency of CLK
2. Input Command “sendchar sfr”, then you can confirm the current value.
3. Check X’tal Frequency. (13.824000 MHz ± 100 Hz).
4. If the frequency is not 13.824000 MHz ± 100 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 13.824000 MHz ± 5 Hz.
reading of the frequency counter is 13.824000 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, C8,
C9, R64
(I)* Transmitted Power Con-
firmation
-
Remove the Antenna before starting step from 1 to 4.
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,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C861, L801,
L803, DA801,
R801, R802,
R805~R807
(J)*
Modulation Check
-
Follow steps 1 to 3 of (I).
4.Confirm that the B-Field Modulation is -340±30/ +340±30 kHz/div & Modulated
width 660 kHz using data type Fig 31.
width 660 kHz using data type Fig 31.
IC1,
C802~C806,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C861, L801,
L803, DA801,
R801, R802,
R805~R807
(K)* Frequency Offset Confir-
mation
-
Follow steps 1 to 3 of (I).
4.Confirm that the frequency Offset is < ± 50 kHz.
IC1,
C802~C806,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C861, L801,
L803, DA801,
R801, R802,
R805~R807
(L)* Frequency Drift Confir-
mation
-
Follow steps 1 to 3 of (I).
4.Confirm that the frequency Drift is < ± 35 kHz/ms.
IC1,
C802~C806,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C861, L801,
L803, DA801,
R801, R802,
R805~R807
Items
Check
Point
Procedure
Check or
Replace Parts
<
=
42
KX-TG8521CAB/KX-TGA850RUB
(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,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C861, L801,
L803, DA801,
R801, R802,
R805~R807
(N)* Power RAMP Confirma-
tion
-
Follow steps 1 to 3 of (I).
4.Confirm that Power RAMP is matching.
IC1,
C802~C806,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C808~C814,
C819, C822,
C825~C827,
C834, C860,
C861, L801,
L803, DA801,
R801, R802,
R805~R807
(O) Audio Check and Confir-
mation
-
1. Link to BASE which is conected to Line Simulator.
2. Set line voltage to 48V and line current to 50mA.
3. Input -45dBm (600
2. Set line voltage to 48V and line current to 50mA.
3. Input -45dBm (600
Ω)/1kHz to MIC of Handset.
Measure the Level at Line I/F and distortion level.
4. Confirm that the level is -7 dBm ± 2 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).
(Receive volume set to second position from minimum).
6. Confirm that the level is -23 dBm ± 2 dBm and that the distortion level is < 5%
at Receiver (34
Ω Load).
IC1, C12, C96,
C97, R25, L3,
C86, R24,
CN4, L72,
CN4, L72,
C14, R306,
L74, C17,
C110, C185,
C82, C83,
C152, R152,
C188, R27,
RA4, C11,
C13, R28,
C13, R28,
MIC, C113,
R34
(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 -25 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 -25 dBm (600
Ω)/1KHz to Line I/F and measure Receiving level at SP+
and SP-.
5. Confirm that the level is -5 dBm ± 2 dBm and that the distortion level is < 5%.
(vol = 3)
IC1, C12, C73,
D13, D14,
R73, R74,
R73, R74,
MIC, C11,
C13, RA4,
R27, R28,
C96, C97, L13,
R24, R152,
C188, R34,
C188, R34,
C113
(Q)
DouBout 3.0V Supply
Confirmation
3.0V
1. Confirm that the voltage between testpoint 3.0V and GND is 3.0V ±0.2V.
C30
Items
Check
Point
Procedure
Check or
Replace Parts
43
KX-TG8521CAB/KX-TGA850RUB
10 Disassembly and Assembly Instructions
10.1. Disassembly Instructions
10.1.1. Base Unit
Ԙ
Remove the 4 screws to remove
the cabinet cover.
the cabinet cover.
ԙ
Remove the tapes and solders.
Ԛ
Remove the parallel wire to remove
the main P.C. board.
the main P.C. board.
Cabinet cover
Ԙ
4 screws
Tapes and solders
ԙ
Ԛ
Parallel wire
Main P.C. board
44
KX-TG8521CAB/KX-TGA850RUB
ԛ
Remove the 4 screws to
remove the operational P.C. board.
remove the operational P.C. board.
Operational P.C. board
ԛ
4 screws
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