I'm working on nak 481 . New belts and tire and recapped (e-caps and orange film). The deck plays fine but is not recording correctly . I did record with it before the recap but I didn't playback the recorded tape , I just went by the meters and didn't use all 3 tape types . So I'm not sure if the problem was there before the recap . The problem is the deck will record in ZX but not in SX or EX . The recorded ZX is attenuated I think as the deck's meters on playback are no where near their level when recording . SX is severely muted I barely hear playback and EX is dead quite . I did notice that the green side polarity markings for C401 ,C402 are reversed, the component side (matches schematic) is right (the way I have it). The voltages are a little low so I was looking for a problem . PIN # 5 on IC 101 & IC 201 is 17.4 Vdc and 18Vdc and should be 21.5Vdc .The voltages are a little low all back to the PS. I have clean the switches a couple of times . I did a test record while switching between ZX, SX, EX . Listening with headphones to the recorded tape ,ZX seems to play louder than what meters are displaying ,SX mutes way down and EX is silence . Any ideas ? the low voltage or switches ? thanks