Galaxy dx55

smokinjoe · Post by **smokinjoe** » Friday 1st Feb 2008, 7:46

I have a galaxy dx55 main board #360014b that when you turn the radio on the receive and transmit is off frequency but you can turn the radio back off then on quickly then every thing works as it should. When the fault occurs i checked the voltage at tp2 and it shows 0.2 volts but like i said you can turn the radio off then back on quickly and everything works like it should and the voltage at tp2 is 3.2 volts like it is supose to have. Any ideas as to what could cause this problem. Thanks

ramblingman · Post by **ramblingman** » Saturday 2nd Feb 2008, 16:01

check for poor solder connections in the v.c.o area

smokinjoe · Post by **smokinjoe** » Sunday 3rd Feb 2008, 2:14

Thanks for the help ramblingman i will try and do this tomorrow as i have to go back to work right know you wouldn't happen to know were the supply voltage for tp2 comes from would you? every time i touch the probe around L17 to check for the supply voltage for tp2 the voltage drops and the fault reoccurs so its hard to track down.Thanks for your help.

ramblingman · Post by **ramblingman** » Sunday 3rd Feb 2008, 7:27

sure sounds like a poor solder connection...get you a plastic scratchin tool..i use a old plastic tuning screwdriver..dont use anything metal...remove the top cover,,power up the unit..bump and scratch lightly around until the fault appears.. then lightly go from on solder joint to another with scratchin,,until it straigtens back up..once youve isolated the problem areas..re-heat the solder joints in this area..this should take care of your trouble..it probably will be in or around v.c.o area...check joints in the area,,that you were testing..your probably close.....

fatdude1 · Post by **fatdude1** » Sunday 3rd Feb 2008, 7:32

make sure you do this

10.240 MHz PLL REFERENCE:
RX Mode, AM,
Freq. to 26.965MHz Band D
Fine and coarse clarifier control to center detent.

Connect Frequency counter to IC5 Pin 4.

Check for 10.2400MHz ?200 Hz. If tolerance is beyond this, replace X1 (10.240MHz).

check the solder connections on the crystal there should be a wire jumper from the top of the crystal to a metal can close by

smokinjoe · Post by **smokinjoe** » Monday 4th Feb 2008, 3:50

Thanks for every ones help on this radio checked for cold solder joints and the fault was still there so i removed L17 and the can fell apart and some of the pins were not connected so i replaced this can and every thing works as it should. Thank you all for your help.