KX-TG8081RUB, KX-TGA806RUB (serv.man3) - Panasonic Telephone Service Manual Supplement (repair manual). Page 9

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9
(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. (10.368 MHz ± 20 Hz).
4. If the frequency is not 10.368 MHz ± 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.
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. 
IC1, X1, C47
 
(I)*
Transmitted Power 
Confirmation
-
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
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.
IC1, 
C802~C803, 
C805, C806, 
C810, L809, 
C811, C814, 
R806, C825,  
DA801
(J)* Modulation Check and 
Adjustment
-
Follow steps 1 to 3 of (K).
4.Confirm that the B-Field Modulation is -350 ± 50/+350 ± 50 kHz/div &
Modulated width   610 kHz using data type Fig 31.
IC1
(K)*
Frequency Offset 
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that the frequency Offset is < ± 20 kHz.
IC1
(L)*
Frequency Drift 
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that the frequency Drift is < ± 20 kHz/ms.
IC1
(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.
IC1, 
C802~C804, 
C826, C837, 
C820, C822,  
DA801, R807
(N)*
Power RAMP 
Confirmation
-
Follow steps 1 to 3 of (I).
4.Confirm that Power RAMP is matching.
IC1
(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 50 mA.
3. Input -45 dBm(600 
)/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 
 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).
6. Confirm that the level is -24 dBm and that the distortion level is <5%    at
Receiver (34 
 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 
)/1KHz 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%. 
(vol = Max at SP (8 
 Load))
IC1, C12, C73, 
D13, D14, 
MIC, C11, 
C13, RA4, 
R27, R28, 
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.
C704, 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 
Items
Check 
Point
Procedure
Check or 
Replace Parts
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