SRB speed control problem

[zappto 192]

Today i got a problem with my SRB speed control, i got it with a car. Now i am using old acoms ap 227 transmiter and receiver. It was working fine for a while, but today noticed reverse is not working, i hear strange sound from speed control, like beeping, but car moves very slow, or stops. I do not know what speed control it is, might it is possible to repair. Thank you!

 

[KEV THE REV 2307]

Firstly , is your main stick pack charged enough to power up above 5 volts