Motorola CDM1550-LS+ - VCO Troubleshooting Chart (700 Mhz)

3-16
3.13 VCO Troubleshooting Chart (700 MHz)
RXVCO
LOW OR NO RF SIGNAL
AT C3335
NO
MAKE SURE SYNTHESIZER IS
WORKING CORRECTLY AND
LOW OR NO RF SIGNAL
AT INPUT TO PA
RUNNER BETWEEN U3301 PIN ..... ~~::_
28 AND U4301 PIN 14&18 IS OK.
IF
ALL PARTS FROM U3301
>--I~ PIN 8 TO BASE OF 03302 ARE
TROUBLESHOOT 03301 AND
ASSOCIATED CIRCUITRY.
OK,
REPLACE U3301
IF ALL PARTS ASSOCIATED
"".>~~ WITH THE PINS ARE
OK, REPLACE 03302
TROUBLESHOOT 03304 AND
ASSOCIATED CIRCUITRY.
Maintenance
TXVCO
REPLACE 03305