CR1020 voltage issue
- Thread starter Monnich
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Awesome i will check that when i get home from work and give you an update thank you so much for the help
Will do as soon as the railroad releases me from their grasp lol.
Ok i re flowed most of the solder on the board and the voltage at the emitter went up from 7 v to 11 v unfortunately tr704 had issues lf some sort snd burnt itself up
Try measuring resistance from -NB pin to TR715e, should be less than 1ohm.
Again check solder on that -NB post
Love these old pieces and watching the local pro's guide ya. Good stuff.
Well, good job. TR715?Tr714 actually. Now it ive got relay click and it even plays music on the one channel i have in although it dosent get very loud?
Check the collector voltages of the 4 output transistors. Should be around +/- 49vdc. +B and -B can be measured carefully** on the output transistor's metal cases.
**----- Don't short the metal cases to the heatsink --- You will regret it.
Does it sound the same on both channels?
On the rear panel there is a pre-main coupler switch. Exercise the switch a dozen times. See if it changes anything.
That switch is notorious for getting real dirty. The backside of gear usually has a lot more dust build-up than the front side.
On the rear panel there is a pre-main coupler switch. Exercise the switch a dozen times. See if it changes anything.
That switch is notorious for getting real dirty. The backside of gear usually has a lot more dust build-up than the front side.
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Direct mains , also this is my first time working on one of these thank you so much for the help and guidance