Multitone RPR 583, Technical Manual

Page: 56 / 91

IS CALL RECEIVED?
CHECK
REALIGN AND
DE-CASE.
PLACE IN P671.
CHECK 1V LINE.
IS LEVEL 1V ±50mV?
CHECK TP416, TR406,
IC401.
SEND PRE-AMBLE.
AT 50dBm WITH
±4.5kHz DEVIATION.
IS DATA PRESENT ON
IC401 PIN 18?
IS DATA PRESENT ON
IC401 PIN 12?
CHECK TR408 (IF FITTED)
R412, R463 AND R465
CHECK IC401
IS DATA PRESENT ON
IC401 PIN 11?
IS 455kHz PRESENT ON
IC401 PIN 10?
IS VOLTAGE ON
IC401 PIN 17 >1.3V?
CHECK FL404, C425
IC401 FAULTY. CHECK R457
CHECK R425, R429
AND IC401.
IS 455kHz PRESENT ON
IC401 PIN 6?
SENSITIVITY.
RECEIVER
RE-TEST
O.K.
NO
LOW
>3dBm
O.K.
YES
NO YES
YES
NO
YES
NO
YES
NO
YES NO
YES
NO
YES
NO
‘B’
‘C’
PLACE THE UNIT IN A
P671. SEND A CALL.
TAG11347-1
‘B’
RPR 583
TM1212 Issue 1 Page 5 - 12
Fig. 5.6: Fault Finding Guide (Sheet 2 of 3)