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17

This model can operate in power failure state by two temporary power sources.
One is supply from handset, the other is supply from large capacitor.

When AC power is lost, base unit sends power failure information to handset. BBIC(IC1) turns Q11 on and, battery voltage appear 
to CHG terminal.
When CHG+ (supply voltage from handset) is higher than Vbat, Q351 is on. And, this unit continues working in power failure condi-
tion.
It's possible to use the units during the power failure, supplying power to VBAT of base unit from battery of handset through Q10, 
CHG terminal and Q351.
If emitter voltage is lower than collector, Q351 is OFF for the backflow prevention.

This model has PAS capacitor (CAP) to keep talking for only a limited time under the sudden power failure state.
CAP is charged at 2.5V in standby mode and charged at up to 3.0V in talk mode. Charge voltage is controlled by Q901 and Q902 to 
extend the life time of CAP.
In case that the power from AC adapter is lost, BBIC(IC501) turns Q901 ON instantly and CAP supplies current to Vbat.

Q353

Q354

R351

R352

R353

R354

R360

Q352

R355

Q351

CHG+

Vbat

R45

Q11

R11

Q10

R12

R13

BBIC

IC1

71

Battery

CHG-

HANDSET

BASE

BBIC

IC501

Vbat

R903

R923

R906

R918

R925

Q905

R917

R907

Q903

R902

R901

Q902

Q901

C901

82

71

18

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)

SP-PHONE TX
(to Tel Line)

 SP-PHONE RX
(from Tel Line)

Caller ID
(from Tel Line)

(BASE UNIT)
B - P101 - C121 - R121 - IC501 (25)         IC501 (45)       
A - C122 - R122 - IC501 (24)                    IC501 (44)

(BASE UNIT)

IC501 (28) 

- L505 - C184 - 

Q161

 - 

Q141

 - 

D101         A

(BASE UNIT)

A                    D101

 - 

Q141

 - Q161 - R164 - R177 - C173 - Q171 - 

C178

 - R178 - 

IC501 (16)

(HANDSET)
MIC (+) - 

C13

 - 

IC1 (17)

        IC1(86) 

MIC (–) - 

C11

 - 

IC1 (18)          

IC1(87) 

C859  

- C801 - ANT to BASE

(BASE UNIT)
from HANDSET   

ANT1

 - 

C894         DA802

 - 

C895

 

ANT2

 - 

C893

IC501 (46)  
IC501 (47)

 P101

- 

B

 P101

- 

B

B - P101

IC501 (45)         C819 -  DA802       C894 - ANT1
IC501 (44)

 to HANDSET

(HANDSET)

from BASE UNIT   ANT - C801

(BASE UNIT)

A                 

D101 - Q141 - Q161 - R164 - R177 - C173 - Q171 - C178 - R178 - IC501 (16)

B - P101

C893 - ANT2

IC1 (1)
IC1 (2)

IC1 (21) - RECEIVER (+)

IC1 (22) - RECEIVER (–)

DA802 –– C894 - ANT1
              – C893 - ANT2                

 to HANDSET

 to HANDSET

(HANDSET)
from BASE UNIT   ANT - C801 –– IC1 (1) ––– IC1 (35) - SP (–)

                                                                                         – IC1 (2) –  – IC1 (37) - SP (+)

(BASE UNIT)
A                  D101 - Q141 - Q161 - R164 - R177 - C173 - Q171 - C178 - R178 - IC501 (16) 
B - P101
–– IC501 (45) - C819 -  DA802 –– C894 - ANT1
  – IC501 (44)                              – C893 - ANT2

IC501 (28) - L505 - 

C184 - Q161 - Q141 - D101          A

(HANDSET)
MIC (+) - 

C13

 - 

IC1 (17)

        IC1(86) 

MIC (–) - 

C11

 - 

IC1 (18)          

IC1(87) 

C859  

- C801 - ANT to BASE

(BASE UNIT)
from HANDSET   

ANT1

 - 

C894         DA802

 - 

C895

 

ANT2

 - 

C893

IC501 (46)  
IC501 (47)

 P101

- 

B

IC501 (28) - L505 - 

C184 - Q161 - Q141 - D101          A

19

SIGNAL ROUTE

ROUTE

IN

OUT

SIGNAL

Memo/OGM
Recording
(from Handset)

ICM Recording
(from Tel Line)

(BASE UNIT)
from HANDSET   

ANT1 - C894 –– DA802  –– 

IC501 (46)

 –– 

IC501 (74) - IC601 (5)

                                 

ANT2 - C893 –

 – IC501 (47) –

(BASE UNIT)
A

 –––––––– 

D101 - Q141 - Q161 - R164 - R177 - C173 - Q171 - C178 - R178 - IC501 (16) - 

B - P101

–

IC501 (74) - IC601 (5)

 

Message Play
(to Handset)

(BASE UNIT)
IC601 (2) - IC501 (73)       IC501 (45)        C819 - 

 

 

(BASE UNIT)

IC601 (2) - IC501 (73) - IC501 (28)  - C184 - Q161 - Q141 - D101        A

Message Play
(to Tel Line)

Message Play
(to Base Unit)

(BASE UNIT)
IC601 (2) - IC501 (73)        IC501 (31) -  SPp 

IC501 (29) -  SPn

IC501 (44)

DA802 

 C894 - ANT1

 C893 - ANT2

 to HANDSET

(HANDSET)
from BASE UNIT   ANT -  C801 –– IC1 (1)
                                                  

– IC1 (2)

IC1 (35) - SP (–)

IC1 (37) - SP (+) 

P101 - B

(HANDSET)
MIC (+) - 

C13

 - 

IC1 (17)

        IC1(86) 

MIC (–) - 

C11

 - 

IC1 (18)          

IC1(87) 

C859  

- C801 - ANT to BASE

20

Refer to the Operating Instructions.

You can download and refer to the Operating Instructions (Instruction book) on TSN Server.

Refer to the Operating Instructions.

You can download and refer to the Operating Instructions (Instruction book) on TSN Server.

Refer to the Operating Instructions.

You can download and refer to the Operating Instructions (Instruction book) on TSN Server.

Items

Contents

Battery

You could use other rechargeable batteries sold in a market, but the unit is not guaranteed to work 
properly.

The battery strength may not be indicated correctly if the battery is disconnected and connected again, 
even after it is fully charged. In that case, by recharging the battery as mentioned in the Operating 
Instructions, you will get a correct indication of the battery strength.

PIN Code

Recall

Earth Recall feature is not supported in this model.

L Change the PIN using the following method.

7

Enter the new 4-digit base unit PIN. 

i

M 

i 

{ic}

#

1 (right soft key)      132