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45

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.45)

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

After the measuring, suck up the solder of TP.
*: Connections (P.58) is required beforehand.
The connections of adjustment equipments are as shown in Adjustment Standard (Handset) (P.60).

Items

Check 

Point

Procedure

Check or 

Replace Parts

(A)* 1.8 V Supply Adjustment

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).

IC1, Q2, C48, 

D1, C1, C44, 

R45, C40, 

C45, F1

(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, RA61, 

R64, R66

(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,  

RA40, C172

(D) Charge Control Check & 

Charge Current Monitor 

Check

-

1. Apply 3.5 V between CHG(+) and CHG(-) with DC power supply and set

current limit to 250 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.

3. Decrease current limit of DC power supply to 100 mA.
4. Confirm that the current limit LED of DC power supply is stable. (Current limiter

is ON.)

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

IC1, Q4 Q9, 

D7, R6, R7, 

F1, C1, R2, 

R30, R31, R8,  

R45

(E)* Charge Detection (OFF) 

Check

-

1. Stop supplying 3.5 V to CHG (+) and CHG (-).
2. Confirm the indication of “charging” has been cleared.

IC1, Q4 Q9, 

D7, R6, R7, 

F1, C1, R2, 

R30, R31, R8,  

R45

You have DECT Tester. 

(Model Number : CMD60)

Check item (A)-(D), (E)-(G).

Check item (A)-(D), (E)-(G).

Check item (A)-(C), (H),(O).

Check item (A)-(C), (H-(M))-(O)

-

Check item (I)-(N).

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

Check item (A)-(C), (I)-(N).

Check item (O).

Check item (O).

Check item (P).

Check item (P).

Remedy (*2)

Symptom

You don't have DECT Tester.

checksum value

program number 

ex.)

3655

DBT2RN

46

(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 - 1D’’
Execute the command “×wreeprom 00 0A 01 ZZ”.

ZZ = YY - 1D

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 ± 100 Hz).
4. If the frequency is not 10.368 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 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” “7” “9” “#” 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, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(J)*

Modulation Check

-

Follow steps 1 to 3 of (K).

4.Confirm that the B-Field Modulation is -370±30/ +370±30 kHz/div & Modulated
width   690 kHz using data type Fig 31.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

Items

Check 

Point

Procedure

Check or 

Replace Parts

47

(K)*

Frequency Offset 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Offset is < ± 50 kHz.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(L)*

Frequency Drift 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that the frequency Drift is < ± 35 kHz/ms.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(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~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(N)*

Power RAMP 

Confirmation

-

Follow steps 1 to 3 of (I).

4.Confirm that Power RAMP is matching.

IC1, 

C802~C806, 
C808~C814, 
C819~C820, 

C822, 

C825~C827, 

C834, 

C860~C864, 

L801~L804, 

DA801, 

R801~R808

(O)

Audio Check and 

Confirmation

-

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

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

and distortion level.

4. Confirm that the level is -1.0dBm±2 dBm and that the distortion level is<5% at

TEL Line (600

Ω Load).

5. Input -20dBm(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 -25dBm±2 dBm and that the distortion level is <5% at

Receiver (150

Ω Load).

IC1, C12, C96, 

C97, R215, 

R27, RA4, 

C11, C13, 

R28, D3, D4, 

MIC, R73, R74

(P) SP phone Audio Check 

and Confirmation

-

1. Link to Base which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 50mA.
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 -9.5 dBm ± 2 dBm and that the distortion level is < 5%.

(vol = 3)

IC1, C12, C73, 

D13, D14, 
R73, R74, 

MIC, C11, 

C13, RA4, 

R27, R28, 
C96, C97, 

R215, C72

(Q)

Charge Pump 3.0V 

Supply Confirmation

CP3.0V

1. Confirm that the voltage between testpoint CP3.0V and GND is 3.0±0.3V.

C49, C52~C54

(R)

Charge Pump 4.0V 

Supply Confirmation

(This item is not applied)

CP4.0V

1. Confirm that the voltage between testpoint CP4.0V and GND is 4.0V±0.3V.

C50, C51, 

C55

Items

Check 

Point

Procedure

Check or 

Replace Parts

48

When the customer’s telephone line corresponds to the following conditions, and the transmission signal of SP-Phone is
interrupted, performing the next set up to a cordless handset will improve it to some extent.
Conditions

1. When customer’s line has less line loss.

ex.) The customer is using optical fiber, ISDN terminal adaptor, or PBX.
In this case, receiving signal is strong and it may affect transmission signal.

2. When the other party is talking from noisy place.

ex.) The other party is using cellular phone. The background noise is very loud.
In this case, the noise from the other party (i.e. surrounding noise) may affect transmission signal.

• Change the handset address of EEPROM (0129) from 00 to 01 by Engineering Mode.