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5

SIGNAL ROUTE

ROUTE

IN

OUT

SIGNAL

DTMF TONE
TEL OUT
(to Tel Line)

CDL TX
(to Tel Line)

CDL RX
(from Tel Line)

DTMF TONE
TEL IN
(from Tel Line)

B - P1 

SP-PHONE TX
(to Tel Line)

 SP-PHONE RX
(to Tel Line)

Caller ID
(from Tel Line)

(BASE UNIT)
B - P1 - C4 -  R6 - R33 - IC7 (21)        IC7 (95) -   
A - C3 -  R4 - R35 - IC7 (23)

(BASE UNIT)
IC7 (27) - R116 - R29 - C22 - Q5 - Q3 - D3          A 

P1 - B

(BASE UNIT)
A              D3 - Q3 - Q5 - R20 - C56 - R117 - IC7 (25)

(HANDSET)
MIC (+) - C13 - RA4 - IC1 (17)        IC1(86) 
MIC (  ) - C11 - RA4 - IC1 (18)          IC1(87)        L809 -
DA801 -  C803 - ANT  to BASE

(BASE UNIT)
from HANDSET   ANT1 - C851         DA802 - C803 - DA801 - C826 

ANT2 - C853

     

 C864 - IC7 (3)  

 C863 - IC7 (2) 

IC7 (27) - R116 - R29 - C22 - Q5 - Q3 - D3 

 P1- B

 A

- L802        C812 - DA801 - C803 -  DA802 

D3 - Q3  - Q5 - R20 - C56 - R117 - IC7 (25)        IC7 (95) - 

 to HANDSET

(HANDSET)
from BASE UNIT   ANT - C803 - DA801 - C826 

(BASE UNIT)
A      
B - P1

 IC7 (94) - 

 C851 - ANT1
 C853 - ANT2

IC1 (2)
IC1 (1)

IC (21) - RECEIVER (+)

IC (22) - RECEIVER (  )

IC7 (94) - C813

 L802         C812 -    

DA801 -  C803 - DA802       

 to HANDSET

 C851 - ANT1
 C853 - ANT2

(HANDSET)
MIC (+) - C13 - RA4 - IC1 (17)        IC1(87) 
MIC (  ) - C11 - RA4 - IC1 (18)          IC1(86) 
DA801 - C803 - ANT to BASE

(BASE UNIT)
from HANDSET   ANT1 - C851         DA802 - C803 - DA801 -C826 

ANT2 - C853

     

    L809 -

C864 - IC7 (3)  

C863 - IC7 (2) 

IC7 (27) - R116 - R29 - C22 - Q5 - Q3 - D3 

 P1 - B

 A

- L802       C812 - DA801 - C803 - DA802 

D3 - Q3  - Q5 - R20 - C56 - R117 - IC7 (25)        IC7 (95) -

 to HANDSET

(HANDSET)
from BASE UNIT   ANT - C803 - DA801 -  C826 

(BASE UNIT)
A      
B - P1

 IC7 (94) -

 C851 - ANT1
 C853 - ANT2

C864 - IC1 (2)
C863 - IC1 (1)

IC1 (35) - SP (-)

IC1 (37) - SP (+)

- C813 

- C813 

6

SIGNAL ROUTE

ROUTE

IN

OUT

SIGNAL

Memo/OGM
Recording
(from Handset)

ICM Recording
(from Tel Line)

(BASE UNIT)
from HANDSET        ANT1 - C851          DA802 - C803 - DA801 - C826 

                                     IC7(70) - IC421(5)

 ANT2 - C853

B - P1

(BASE UNIT)
A               D3 - Q3 - Q5 - R20 - C56 - R117 - IC7 (25) - IC7(70) - IC421(5)  

Message Play
(to Handset)

(BASE UNIT)
IC421(2) - IC7 (69) 

(BASE UNIT)
IC421(2) - IC7 (69) - IC7 (27) - R116 - R29 - C22 - 

A

Message Play
(to Tel Line)

Message Play
(to Base Unit)

(BASE UNIT)
IC421(2) - IC7 (69)        IC7 (41) - L141 - SPp 

IC7 (43) - L140 - SPn

(HANDSET)
MIC (+) - C13 - RA4 - IC1 (17)        IC1(86) 
MIC (  ) - C11 - RA4 - IC1 (18)          IC1(87)
DA801 - C803 - ANT

     L809 -

to BASE UNIT 

 C864 - IC7(3)

 C863 - IC7(2)

IC7(95) -  IC801 (9) - L802          C812 - DA801 - C803 -

IC7(94) - C813

DA802 

 C851 - ANT1

 C853 - ANT2

 to HANDSET

(HANDSET)
from BASE UNIT   ANT -  C803 - DA801 - C826 

IC1 (2)
IC1 (1)

IC1 (21) - SP (-)

IC1 (22) - SP (+) 

  Q5 - Q3 - D3

P1 - B

Headset Tx
(to Tel Line)

(HANDSET)
CN4 (2) - L72 - R306 - C14 - R22 - IC1 (19)       IC1 (86) 

fron Handset ANT1 - C851        DA802 - C803 - DA801 - C826        C864 - IC7 (3)        IC7 (23) - 

IC7 (87)        L809 - DA801 - C803 - 

ANT to BASE

- R116 - R29 - C22 - Q5 - Q3 - D3 

P1 - B 

to Handset

A

C863 - IC7 (2)

ANT2 - C853

Headset Rx
(from Tel Line)

(BASE UNIT)

(BASE UNIT)

fron BASE UNIT 

- C803 - DA802        C851 -  ANT1

- CN4 (5)

B - P1

A               D3 - Q3 - Q5 - R20 - C56 - R117 - IC7 (21)        IC7 (79) - L802        C812 -  DA801 - 

IC1 (1)

IC7 (78) - L813

C853 - ANT2

ANT - C803 - DA801 - C826       IC1 (2)        IC1 (21) - L9 - C86 - L74 

(HANDSET)

7

Check Power Supply Circuit/Reset Circuit.

Check BBIC (IC1).

Check X1.

Is the voltage of  BATT+ 2.3 V more?

Check the battery and around BATT+ and
BATT- are not shorted.

Is the battery inserted BATT+ and BATT-?

Does BBIC (IC1: 8) oscillate at 10.368 MHz?

YES

YES

YES

NO

NO

YES

YES

Is the voltage of " 1.8V"  about 1.8 V?

(When LED is On)

Is the voltage of CP3.0V about 3.0V?

Check BBIC (IC1).

YES

Is the voltage of CPV2 about 3.0V?

YES

Is the voltage of CP2.8V about 2.8V?

NO

NO

NO

Is BBIC (IC1: 34) high at charge state?

Check Charge Circuit.

Check Power of Handset.

Is Check Power OK?

NO

NO

YES

Does the bell sound from SPEAKER?

Check around SP+, SP- .

When bell signal coming, is there bell sound signal 
at BBIC (IC1: 35, 37)?

NO

NO

YES

When bell signal coming, is there bell sound signal
at SP+, SP- ?

YES

Check BBIC (IC1), C78, C79, C73, C72, D13, 
D14 , C77, C76, R77, R76.

NO

Check cable of SPEAKER and resistance value
of SPEAKER.

8

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

After the measuring, suck up the solder of TP.
*:  Connections is required beforehand.
The connections of adjustment equipment are as shown in Adjustment Standard (Handset) (P.11).

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, C44,  

C344, C40, 

C45, F1, C10, 

C2, C34, R7

(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 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, Q4 Q9, 
Q5, Q6, R9, 

R4, R5, R33, 

C19, F1, C1, 

R30, R31, R8, 

R45

(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, Q4 Q9, 
Q5, Q6, R9, 

R4, R5, R33, 

C19, F1, C1, 

R30, R31, R8, 

R45

(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

checksum value

program number

ex.)

93F0

DCK2RP