KX-TG6621RUB, KX-TG6621RUM, KX-TG6621UAB, KX-TG6621UAM, KX-TG6621CAB, KX-TG6621CAM, KX-TG6622CAB, KX-TGA661RUB, KX-TGA661RUM - Panasonic Telephone Service Manual (repair manual). Page 41

41

(F)* Battery Monitor Check

-

1. Apply 2.25 V between BATT+ and BATT-.
2. Execute the command 

sendchar PAD
sendchar LED 0
sendchar CRX 0 1
sendchar AD1
It assumes that the return value is XX.
a) 6c   XX   71: No need to adjust
b) XX: 6A ~ 6B: Need to adjust
XX: 72 ~ 74: 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”.

ZZ = YY - C

No Voltage writing data limit is ‘00’.
c) XX: 00 ~ 69: Reject
XX: 75 ~ FF: Reject

IC1, F1, C1, 

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.

IC1, F1, C1, 

R45

(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~C806, 
C809~C814, 
C820, C822, 

C823, 

C825~C826, 

L802, C863, 
C864, L803, 

DA801, R806, 

R807

(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, 

C802~C806, 
C809~C814, 
C820, C822, 

C823, 

C825~C826, 

L802, C863, 
C864, L803, 

DA801, R806, 

R807

(K)*

Frequency Offset 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Offset is < ± 20 kHz.

IC1, 

C802~C806, 
C809~C814, 
C820, C822, 

C823, 

C825~C826, 

L802, C863, 
C864, L803, 

DA801, R806, 

R807

Items

Check 

Point

Procedure

Check or 

Replace Parts