Multitone RPR 561, Technical Manual

Page: 61 / 109

NO YES
>3dBm LOW
YES
YES
NO
NO
NO
YES
NO
NO YES
YES
NO
YES
`C'
`B'
OK
RECEIVER O.K.
CHECK
TRANSMITTER
CHECK TR20,
TR23 & IC1.
DISABLE BEC BY
LEAD. IS 1V LINE OK?
INJECT MODULATED
SIGNAL*.
AT SK301 PIN 7?
CHECK IF FL1 OR
IC1 ARE FAULTY
IS 455kHz PRESENT
AT IC302 PIN 5?
IS DATA
PRESENT AT
SK301 PIN 2?
RE-ALIGN Rx
AND RE-TEST.
INJECT 455kHz SIGNAL AT 5µV
TO FL3 INPUT. MODULATE
WITH 1kHz TONE.
IS 1kHz PRESENT AT
SK301 PIN 12?
CHECK IC1,
FL2, C82, C81.
CHECK FL3, FL4, TR25,
CHECK IC105
(GATE ARRAY).
CHECK DATA FILTER
AND LIMITER, TR26,
TR29, TR27 AND IC1.
IS 455kHz PRESENT
AT IC1 PIN 1?
CHECK RF STAGES.
TAG10862-1
CHECK
SENSITIVTY.
REMOVE CASE BACK &
OR MISALIGNED.
IC1, AND ASSOCIATED
CONNECTING TEST
SEND CALL.
IS CALL RECEIVED?
ANTENNA. FIT MODIFIED
IS 1kHz TONE PRESENT
CASE BACK & RE-FIT
BATTERY.
COMPONENTS.
-70dBm AT CHANNEL FREQUENCY WITH 1kHz
TONE AT ±1.5kHz DEVIATION (12.5kHz CHANNEL
SPACING) OR ±3kHz DEVIATION (25kHz ).
RPR 561
TM1200 Issue 1 Page 5 - 12
Figure 7: General Fault Finding Guide (2 of 3)