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Model
KX-TG1711CAB KX-TG1711CAJ KX-TG1712CAB KX-TGA171RUB KX-TGA171RUJ (serv.man2)
Pages
28
Size
1.68 MB
Type
PDF
Document
Service Manual / Supplement
Brand
Device
Telephone / DIGITAL CORDLESS PHONE
File
kx-tg1711cab-kx-tg1711caj-kx-tg1712cab-kx-tga171ru.pdf
Date

Panasonic KX-TG1711CAB / KX-TG1711CAJ / KX-TG1712CAB / KX-TGA171RUB / KX-TGA171RUJ (serv.man2) Service Manual / Supplement ▷ View online

7
3.1.4.
Circuit Operation (Handset)
[Changed from original section "4.4. Circuit Operation (Handset)"]
3.1.4.1.
Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+ 
 F1  R39  CHARGE+ (Base)  CHARGE+ (Handset)  Q101  F1  BATTERY+... Battery... 
BATTERY- 
 R102  GND  CHARGE- (Handset) CHARGE- (Base)  GND  DC- (GND)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q101 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.5).
3.1.5.
Signal Route
[Changed from original section "4.6. Signal Route"]
(BASE UNIT)
IC3 - AOP - R2 - C5 - Q1 - Q3 - D2       A
SIGNAL ROUTE
ROUTE
IN
OUT
SIGNAL
DTMF TONE
TEL OUT
(to Tel Line)
CDL TX
(to Tel Line)
CDL RX
(from Tel Line)
(BASE UNIT)
from HANDSET        ANT1                   D6 - C808 - D801 - C820 - IC3 - RXI, RXIX - IC3 - AOP -  
B
 ANT2 -  C39
R2 - C5 - Q1 - Q3 - D2         A
B
C70
C71
B
(BASE UNIT)
A        D2 - Q3 - R12 - C15 - R14 - IC3 - LINEA - IC3 - PO, POX - C826 - D801 - C808
Caller ID
(from Tel Line)
(BASE UNIT)
A - C26 - R33        R50        R200 - IC3 - LINEN
B - C27 - R34        R51        R201 - IC3 - LINEP
           -  D6          ANT1 to HANDSET
C39 - ANT2 to HANDSET
IC103 - H01N - SPEAKER (-)
(HANDSET)
from BASE UNIT - ANTENNA - C149 - D803 - C820 - IC3 - RXI, RXIX       IC103 - H01P -  SPEAKER (+)
(HANDSET)
MIC        C105 - IC103 - MICP                      IC3        PO          C826 - D803 - C149 - ANT1 to BASE UNIT
R105 - C106 -  IC103  - MICN
POX
DTMF TONE
TEL IN
(from Tel Line)
B
(BASE UNIT)
A        D2 - Q3 - R12 - C15 - R14 - LINEA - IC3
8
3.2.
Troubleshooting Guide
3.2.1.
Check Power
[Changed from original section "9.1.1. Check Power"]
3.2.1.1.
Base Unit
Is the AC Adaptor inserted into AC outlet? (Check AC Adaptor’s specification.)
Cross Reference
Power Supply Circuit (P.5)
Is input of IC2 (pin3) about 5.5V?
Check F1 is not opened, C34, C58, C40 is 
not shorted.
Check AC Adaptor.
Check Power Supply Circuit.
Is the output voltage of IC2 (pin2) about 2.65V?
Check X1, C23.
Check IC3. 
Is C48(RESETQ) High?
Check IC3.
YES
YES
YES
YES
YES
YES
NO
NO
NO
9
3.2.2.
Check Link
[Changed from original section "9.1.3. Check Link"]
3.2.2.1.
Base Unit
Cross Reference:
Power Supply Circuit (P.5)
Check Point (Base Unit) (P.12)
Note:
(*1) Refer to Troubleshooting by Symptom (Base Unit and Charger Unit) (P.12).
Check around Power Supply Circuit.
Does Base Unit make link with Handset? 
(Correct working unit)
Check around X1 and adjust clock frequency.
Refer to Check Point...(E).
NO
NO
NO
(*1)
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check the RF circuit in the shield case.
Is the modulation OK?
Refer to Check Point...(I).
Is VDDB pin about 2.65V?
Is there CMD60 (: Dect Tester)?
Is the RF clock (P1.0) oscillate: 10.368MHz in
Base Unit Test Mode?
Refer to Check Point...(E).
Is the NTP value OK?
Refer to Check Point...(H).
Is the RSSI Level OK?
Refer to Check Point...(M).
Does Base Unit make link with CMD60 in 
Base Unit Test Mode?
Refer to Check Point...(H).
NO
YES
Base Unit is OK. Check Handset.
NO
YES
Is the Sensitivity Receiver OK?
Refer to Check Point...(K).
YES
Is the Timing OK?
Refer to Check Point...(L).
YES
Is the Frequency Offset OK?
Refer to Check Point...(J).
10
3.2.2.2.
Handset
Cross Reference
Power Supply Circuit/Reset Circuit
Check Point (Handset)
 (P.15)
Note:
(*1) Refer to Troubleshooting by Symptom (Handset) (P.15).
Check around Power Supply Circuit/Reset Circuit.
Does Handset make link with Base Unit?
(Correct working unit)
Check around X101 and  adjust clock frequency. 
Refer to Check Point...(H).
NO
NO
NO
(*1)
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check the RF circuit in the shield case.
VDDBAT about 2.6 V?
Is the RF clock (P1.0) oscillate: 10.368MHz
in Base Unit Test Mode?
Refer to Check Point...(H).
Is the NTP value OK?
Refer to Check Point...(I).
Is the RSSI Level OK?
Refer to Check Point...(N).
Does Base Unit make link with CMD60 in
Base Unit Test Mode?
Refer to Check Point...(I).
NO
Handset is OK. Check Base Unit.
YES
Is there CMD60 (: Dect Tester)?
NO
YES
Is the modulation OK?
Refer to Check Point...(J).
YES
Is the Frequency Offset OK?
Refer to Check Point...(K).
YES
Is the Sensitivity Receiver OK?
Refer to Check Point...(L).
YES
Is the Timing OK?
Refer to Check Point...(M).
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