Mike, don't give up on your meter if you can CAREFULLY remove it from the dase cover and see if the meter will deflect by blowing puffs of air to it, and see if needle is unglued, or stuck to somethi
For the crystal oven, look to see brand name and model no. on it. Go online for elecronic distributors that sell that brand of oven. Or if trusted company like Mouser, Newark, Allied, etc. see if the
For fan oiling, first clean all dusty surfaces. Then run the fan until it heats up. Spray de-Oxit into the bearing behind the sticker at hub of fan blade, and re-attach the sticker or one like it. As
Kim had a great suggestion, which eases the application of new lubricant to heat sink fans. Tilt the radio such that the central fan bearing is pointing UP, before you heat up the fan to suck in new
An ohm meter on X100 scale is useful in identifying diodes. You get low impedance in one direction and higher in the other direction. -Stuart Rohre K5KVH
Some newer multi-meters have a separate switch position for diode tests. Using that, you can identify cathode end of the diodes. and a higher reading in the reverse direction, if the diode is not ope
Malcolm, Glad the other guy with Omni VI opened up and offered to photo his diode board, should put you in business to test yours. 73, Stuart Rohre K5KVH
All true diode parameters concerns with the OEM diodes. I wonder if anyone has investigated if the rigs with failing diodes are left plugged into antenna 24/7? It might be accumulation of wind static
My take on the caution about fouling up the lubricant on switches is tha the lube is probably dry and hard by now, over years, and the liquid in DeOxit may improve the switch action and reduce forces
The static crashes with no antenna points to possible electrolytic capacitors going bad, or a bad solder joint. Easiest to first inspect sollder joints from antenna connector all the way to audio out
Mike and interested Scout buffs: It is easy to by pass the finals if you have the 50 watt radio. You will be left with about 5 watts output from the driver stage and its power transistor on the heat
Mike, I should have urged you to also check the power pot control for an open circuit, or bad connections. That is a screwdriver adjusted small pot accessed on the bottom of the transceiver. Hope you
When output goes away operating into high SWR antenna or load; then you have to test the output transistors and driver for opens. This applies to all transmitters with solid state output stages. -Stu
Hints on cooling fan noises applicable to most fans. If it is an older fan, unplug power and try a spin test by hand/ finger. If you have bad bearing, you may hear clik, clik at the bad spot. If you
Another idea for the cause of the noise clicks is a bad ground in interconnecting cable for this circuit. Try a clip lead end to end of the patch cable. Good Luck! Had a similar noise when a custom b