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Model
KX-TG6621RUB KX-TG6621RUM KX-TG6621UAB KX-TG6621UAM KX-TG6621CAB KX-TG6621CAM KX-TG6622RUB KX-TG6622RUM KX-TG6622CAB KX-TGA661RUB KX-TGA661RUM
Pages
20
Size
1.28 MB
Type
PDF
Document
Service Manual / Supplement
Brand
Device
Telephone / DIGITAL CORDLESS ANSWERING SYSTEM
File
kx-tg6621rub-kx-tg6621rum-kx-tg6621uab-kx-tg6621ua.pdf
Date
PREV: Panasonic KX-TG6621RUB / KX-TG6621RUM / KX-TG6621UAB / KX-TG6621UAM / KX-TG6621CAB / KX-TG6621CAM / KX-TG6622CAB / KX-TGA661RUB / KX-TGA661RUM (serv.man3) Service Manual / Supplement

Panasonic KX-TG6621RUB / KX-TG6621RUM / KX-TG6621UAB / KX-TG6621UAM / KX-TG6621CAB / KX-TG6621CAM / KX-TG6622RUB / KX-TG6622RUM / KX-TG6622CAB / KX-TGA661RUB / KX-TGA661RUM Service Manual / Supplement ▷ View online

5
3.1.2.
Circuit Operation (Handset)
[Changed from original section “4.4. Circuit Operation (Handset)”]
3.1.2.1.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+) 
 F1  Q2 (1.8 V), IC1-44pin (3.0V)
The Reset signal generates IC1 (71 pin) and 1.8 V.
1.8 V
Reset
(IC1_71pin)
Battery +
6
3.1.3.
Signal Route
[Changed from original section “4.6. Signal Route”]
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 
7
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(87) 
MIC (  ) - C11 - RA4 - IC1 (18)          IC1(86)
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 (35) - SP (-)
IC1 (37) - SP (+) 
  Q5 - Q3 - D3
P1 - B
8
3.2.
Troubleshooting Guide
3.2.1.
Check Power
[Changed from original section “9.1.1. Check Power”]
3.2.1.1.
Handset
Cross Reference:
Power Supply Circuit/Reset Circuit (P.5)
3.2.2.
Check Battery Charge
[Changed from original section “9.1.2. Check Battery Charge”]
3.2.2.1.
Handset
Cross Reference:
Check Power (P.8)
Charge Circuit
3.2.3.
Bell Reception
[Changed from original section “9.1.8. Bell Reception”]
3.2.3.1.
Handset
Cross Reference:
Telephone Line Interface
Check Link
How to Check the Handset Speaker or Receiver
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.
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