ARE DC LEVELS
CORRECT FOR THE RF
AMP? SEE TABLE 2
PLACE THE MAIN BOARD ON THE P637, POSITION B, AND
CONNECT IT TO THE RADIO BOARD VIA THE 4-WAY
EXTENSION LEAD. FIT A BATTERY. POWER UP THE
RADIO BOARD BY CONNECTING A LINK BETWEEN PINS 1
AND 4 ON SK2
INSERT AN ON-CHANNEL SIGNAL MODULATED WITH 1kHz
ON THE LIVE SIDE OF A CAPACITOR IN SERIES WITH L201
AT A LEVEL OF 1mV
IS I/P LEVEL > -120dBm
FOR 12dB SINAD?
CHECK:
TR201, TR202 AND
ASSOCIATED
COMPONENTS
CAN C209 BE ADJUSTED
TO GIVE A PEAK IN THE
O/P AT SK2 PIN 2 >20mV?
CHECK:
C317, C318, C319,
C336, C322, C323,
YES
NO
YES
NO
REMOVE SCREEN
AND LIFT L201
ARE DC LEVELS
CORRECT FOR TR203,
TR204, XL201?
CHECK:
TR201, TR202 AND
ASSOCIATED
COMPONENTS
CHECK:
TR203, TR204 AND
ASSOCIATED
COMPONENTS
NO
YES
NO
YES
OSCILLATOR WORKING
CHECK:
XL201, L203, R205,
C210, C211, R206
RADIO BOARD OK. RECONNECT:
L201, SCREEN, AERIAL PARTS. RE-ALIGN
PAGER. RE-CASE. SEND CALL
D (RPR 552IS RADIO BOARD)
RPR 550IS Series
TM1188 Issue 1Page 5 - 14
Figure 4: Fault-Finding Guide
(Continued)
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