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37

If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not. 

(*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.37)

Please follow the items below when BBIC or EEPROM or FLASH is replaced.

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).

Symptom

Remedy (*2)

You don’t have DECT Tester.

You have DECT Tester. 

(Model Number: CMD60)

You cannot dial.

Check item (A) - (I), (R).

Check item (A) - (I), (J) - (N), (R).

You cannot hear the caller’s voice.

Check item (A) - (G), (O), (R).

Check item (A) - (G), (J) - (N), (O), (R).

You cannot use the handset a little away from base unit even if the
handset is within range of the base unit.

-

Check item (J) - (N).

The acoustic transmit level is high or low.

Check item (O).

Check item (O).

The acoustic reception level is high or low.

Check item (O).

Check item (O).

Base unit and handset do not link to each other.

Check item (A) - (I).

Check item (A) - (N).

The unit cannot charge.

Check item (P).

Check item (P).

TAM does not work. (for KX-PRW120 only)

Check item (Q).

Check item (Q).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)

3.3 V Supply 
Confirmation

VDD3

1. Confirm that the voltage between test point VDD3 and GND is 3.3 V ± 0.2 V.

IC302, R321, 

R322, C341, 
C342, C352, 

C343, C353 

(B)

1.8 V Supply 
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

value).

Q501, IC501, 

R506, C522, 
C519, C508, 

D501

(C)

1.5 V Supply 
Confirmation

1.5 V

1. Confirm that the voltage between test point  1.5 V and GND is 1.5 V ± 0.02 V.

IC800

(E)*

BBIC Confirmation

-

1. BBIC Confirmation (Execute the command “getchk”).
2. Confirm the returned checksum value.

Connection of checksum value and program number is shown below.

IC501, X1

(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/

SUM” in Software_Version_Table.xls).

IC501, R516, 

IC502, C534

(G)* BBIC Clock Adjustment

CKM

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 ± 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.

IC501, X1, C704

(H)* Hookswitch Check with 

DC Characteristics

-

1. Connect Telephone Socket to Tel-simulator which is connected with 600 

Ω.

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.

P101, Q141, 
R141, R142, 
Q142, R144, 
R145, D101, 
R161~R167, 
D141, Q161, 
R151, IC501

(I) DTMF Generator Check

-

1. Connect Telephone Socket to DTMF tester. (Load=600 

Ω)

2. Link Handset and push dial key.
3. Confirm DTMF character.
4. Confirm that the high Group is -3.0 ± 2 dBm.
5. Confirm that the low Group is-6.0 ± 2 dBm

IC501, C184, 

Q161, D141

, C187

checksum value

87D5

program number

DDP1RN

ex.)

38

(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.

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

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.

IC501, C891, 

C93, C894, 

DA802, Q502, 

C525, R507

(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.

Refer to (J)

(L)* Frequency Offset Check

-

ANTI_TP

Follow steps 1 to 6 of (J).

7.Confirm that the frequency offset is < ± 20 kHz.

Refer to (J) 

(M)*

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.

Refer to (J) 

(N)*

Power RAMP 

Confirmation

-

Follow steps 1 to 6 of (J).

7.Confirm that Power RAMP is matching.

Refer to (J) 

(O)

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 

Ω)/1 kHz to MIC of Handset. Measure the Level at Line I/F

and distortion level.

4. Confirm that the level is -1.5 dBm and that the distortion level is <5% at TEL

Line (600 

Ω Load).

5. Input -20 dBm (600 

Ω)/1kHz 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 -31.0 ± 4 dBm and that the distortion level is <5 % at

Receiver (34 

Ω Load).

IC501, SA101, 

P101, D101, 

Q141, Q142, 

R141, R142, 
R144, R145, 
D141, Q161, 
R163, R164, 
C171, C173, 
R178, C184, 

C187 

(P)

Charging Check

-

1. Connect Charge Contact 12 

Ω/2 W resistor between charge+ and charge-.

2. Measure and confirm voltage across the resistor is 3.9 V ± 0.4 V.

R371, R372, 

D362, C351

(Q)

TAM Operation 

Confirmation

(for KX-PRW120 only)

-

1. TAM Confirmation (Execute the command "sendchar VPI").
2. Confirm the returned Value (Value is "DD37RN 01").

IC501, IC601, 

C60

(R)

2.4V Supply 

Confirmation VDD2 

VDD2

1. Confirm that the voltage between test point VDD2 and GND is 2.5V ± 0.2V.

IC501, Q502, 

C525, R507

Items

Check 

Point

Procedure

Check or 

Replace Parts

39

If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester
(*1) or not. 

(*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 (Handset) (P.39)

Please follow the items below when BBIC or EEPROM is replaced.

After the measuring, suck up the solder of TP.
*: The Setting Method of JIG (Handset) (P.51) is required beforehand.
The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.53).

Symptom

Remedy (*2)

You don’t have DECT Tester.

You have DECT Tester. 

(Model Number: CMD60)

Battery strength is not indicated correctly by Battery icon.

Check item (A) - (D), (E) - (G).

Check item (A) - (D), (E) - (G).

You cannot hear the caller’s voice.

Check item (A) - (C), (H), (N).

Check item (A) - (C), (H - (L)) - (N). 

You cannot use handset little away from base unit even if the
handset is within range of the base unit.

-

Check item (I) - (M).

the Audio level is high or low.

Check item (N).

Check item (N).

The SP-Phone level is high or low.

Check item (O).

Check item (O).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)* 1.8 V Supply Adjustment

1.8V

1. Confirm that the voltage between test point 1.8V 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 1.8V executing command “VDD XX“(XX is the

value).

IC1, Q6, C47, 

R1, P1

(B)*

BBIC Confirmation

-

1. BBIC Confirmation (Execute the command “getchk”).
2. Confirm the returned checksum value.

Connection of checksum value and program number is shown below.

IC1, X1, R27

(C)* EEP-ROM Confirmation

-

1. EEP-ROM Confirmation (Execute the command "sendchar EPV").
2. Confirm the returned Value. (Value for reference is written at "EEPROM C/

SUM” in Software_Version_Table.xls).

IC1, IC3, RA1, 

C8

(D) Charge Control Check & 

Charge Current Monitor 

Check

-

1. Apply 5.0 V between CHG(+) and CHG(-) with DC power supply and set

current limit to 150 mA.
Confirm the indication of “charging” on LCD.

2. Confirm that the current limit LED of DC power supply is ON/OFF.

Confirm it after waiting over 1 minute at least.

(If charge control cannot be confirmed by this procedure, please use battery to
handset power supply and try again.)

IC1, Q3, Q4, 

Q1, Q2, R6, 

R3, R4, R7, 

R5, C7, P1, R1

(E)* Charge Detection (OFF) 

Check

-

1. Stop supplying 5.0 V to CHG (+) and CHG (-).
2. Confirm the indication of “charging” has been cleared.

IC1, Q3, Q4, 

Q1, Q2, R6, 

R3, R4, R7, 

R5, C7, P1, R1

checksum value

program number

ex.)

EB16

DDT2RN

40

(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) 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”.

ZZ = YY - C

c) XX: 00 ~ 65: Reject
XX: 7B ~ FF: Reject

IC1, P1, R1

(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, P1, R1

(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

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, C40

 

(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

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, C50, C51, 

C53, C54, 

(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.

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.

Refer to (I)

(M)*

Power RAMP 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that Power RAMP is matching.

Refer to (I)

(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 

Ω)/1 kHz to MIC of Handset. Measure the Level at Line I/F

and distortion level.

4. Confirm that the level is -3 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).

6. Confirm that the level is -31.0 dBm ± 4 dB and that the distortion level is < 5 %

at Receiver (34 

Ω Load).

IC1, C11, R10, 

R11, R12, 

R13, MIC, C9, 

C10, C38, C39

Items

Check 

Point

Procedure

Check or 

Replace Parts