Multitone FLA 872 Technical Manual page 52

TLA 852/FLA 872
>3dBm
LOW
CHECK
SENSITIVITY.
REALIGN AND
RE-TEST
IS 455kHz PRESENT ON
NO
IC401 PIN 6?
'C'
Page 5 - 12
'B'
PLACE THE UNIT IN THE
P671. SEND A CALL.
YES
IS THE CALL RECEIVED?
O.K.
RECEIVER
O.K.
SEND PRE-AMBLE.
AT 50dBm WITH
±4.5kHz DEVIATION.
IS DATA PRESENT ON
IC401 PIN 18?
IS DATA PRESENT ON
IC401 PIN 12?
IS DATA PRESENT ON
IC401 PIN 11?
NO IS 455kHz PRESENT ON
IC401 PIN 10?
YES
NO IS VOLTAGE ON
IC401 PIN 17 >1.3V?
CHECK IC402
AND R457.
Figure 5.6: Fault Finding Guide (Sheet 2 of 3)
NO
DE-CASE.
PLACE IN P671.
YES
CHECK 1V LINE.
IS LEVEL 1V ±50mV?
CHECK TP416, TR406,
IC401.
YES
CHECK IC402,
NO
PINS 4, 9, 12, 13 AND 14
YES
NO
YES
NO
CHECK R425, R429
YES
CHECK FL404 AND
IC401.
YES
IC401 FAULTY.
'B'
NO
CHECK IC401
TAG11134-1
TM1205 Issue 2