Panasonic UF-5500, Service Manual

Page: 168 / 365

168
UF-5500 / 4500
11.2.10. Analog Section
This chapter provides the testing procedures required for the analog parts. A signal route to be tested is determined depending
upon purposes. For example, the handset TX route begins at the handset microphone and the signal is output to the telephone
line. The signal mainly flowing on this route is analog. You can trace the signal with an oscilloscope. The signal flow on each
route is shown in the Check Sheet here. If you find a specific problem in the unit, for example if you cannot communicate with
the H/S, trace that signal route locally with the following Check Sheet and locate the faulty point.
11.2.10.1. Check Sheet
Signal ROUTE
IN OUT
MONITOR RX
DTMF for TEL Line
FAX Tx
Ringing / Alarm/
Beep / Key tones
DTMF
detection (ON-HOOK)
(SYMPTOM)
CHECK ITEMS
DTMF Monitor
Speaker
CNG detection
FAX Rx
IC300-IC200(1)-C203-R210-R253-C247-L210-IC202(2-1)-R235-C231-L220-IC204(4-5,8)-CN201(1,2)-
CN54(1,2)-Speaker
IC300(B20)-C205-R212-L210-IC202(2-1)-R235-C231-L220-IC204(4-5,8)-CN201(1,2)-CN54(1,2)-
Speaker
TEL LINE-CN100(3,4)-POS100-L107-L106-R135-L111-L100-D103-Q104-R114-C106-IC101(3-5,6)-
IC100(9,10-5)-IC300
EXT TEL LINE-CN101(3,4)-L102,L103-L108,L109-R112,R113-R106,R107-IC101(8,9-5,6)-
IC100(9,10-5)-IC300
IC300(AC24)-IC100(6-9,10)-IC101(5,6-3)-C106-R114-Q104-D103-L100-L111-R135-L106-L107-
POS100-CN100(3,4)-TEL LINE
Bell detection
TEL LINE-CN100(3,4)-POS100-L107-L106-L108,L109-R112,R113-R106,R107-IC101(8,9-5,6)-
IC100(9,10-15)-IC300(L23)
TEL LINE-CN100(3,4)-POS100-L107-L106-R135-L111-L100-D103-Q104-R114-C106-IC101(3-5,6)-
IC100(8,9-5)-IC300(AD26-AB24)-IC200(4-1)-C203-R210-R253-C247-L210-IC202(2-1)-R235-C231-
L220-IC204(4-5,8)-CN201(1,2)-CN54(1,2)-speaker