KX-FT21LA
- 72 -
{IC5(3)-C48-R37-R38-IC9(2-1)-C54-R44-IC8(2-1)-C27-R13-IC1(62-63)-C62-IC8(5-7)-C67-CN2(15)}-
CN1(15)-R15-IC1(4-5,8)-SPEAKER
CHECK SHEET
(SYMPTOM)
ITEMS TO CHECK
ROUTE
I N
O U T
signal
Monitor
TEL LINE-T1-C14-R13-IC2(2-1)-CN1(10)-{CN2(10)-IC6(3-4)-C52-R42-IC8(2-1)-C27-R13-IC1(62-63)-
C62-IC8(5-7)-C67-CN2(15)}-CN1(15)-R15-IC1(4-5,8)-SPEAKER
MIC---J3-C25-R27---IC2(5,6-7)-CN1(14)-{CN2(14)-R62-C66-C60-R51-IC9(6-7)-CN2(11)}
J2-C29-R26
-CN1(11)-C6-R14-T1-TEL LINE
Handset Tx
Handset Rx
TEL LINE-T1-C14-R13-IC2(2-1)-CN1(10)-{CN2(10)-IC6(3-4)-C52-R42-IC8(2-1)-C27-R13-IC1(62-63)-
C62-IC8(5-7)-R60-C63-IC6(8-9)-C65-CN2(16)}-CN1(16)-R21-Q2(B-C)-C31-SPEAKER
DTMF
Monitor
Handset
{IC5(3)-C48-R37-R38-IC9(2-1)-C53-IC6(2-1)C58-R49-IC9(6-7)-CN2(11)}-CN1(11)-C6-R14-T1-TEL LINE
{IC1(59)-R28-C45-R35-IC8(2-1)-C27-R13-IC1(62-63)-C62-IC8(5-7)-C67-CN2(15)}-CN1(15)-R15-
IC1(4-5,8)-SPEAKER
FAX Rx
TEL LINE-T1-C14-R13-IC2(2-1)-CN1(10)-{CN2(10)-IC6(10-11)-R33-C43-IC5(15)}
DTMF TEL LINE
FAX Tx
DUMMY Ring Back
Tone
Note:
{ }: digital board
{IC5(3)-C48-R37-R38-IC9(2-1)-C54-R44-IC8(2-1)-C27-R13-IC1(62-63)-C62-IC8(5-7)-R60-C63-IC6(8-9)-
C65-CN2(16)}-CN1(16)-R21-Q2(B-C)-C31-SPEAKER
TEL LINE-RLY1(3-5)(detection for Ext. TEL)-CN5-J5-R36-C35-R32-T1-C14-R13-IC2(2-1)-CN1(10)-
{CN2(10)-IC6(10-11)-R33-C43-IC5(15)}
DTMF detection
Ringing/Alarm
Beep/Keytone
3-8. Analog Board Section
The analog parts check is actually different than the digital parts check. The signal route is determined by the purpose of the
check. For example, the handset TX route begins from the handset microphone and is output in the telephone line. In this route, it
is mainly an analog signal. Tracing the signal can be done easily using an oscilloscope. Each route is shown on the Check Sheet
here. If there is a problem with the unit (for example, you cannot communicate with the H/S, etc.), trace the signal in the area and
determine the cause.
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