Help needed with a Tascam Porta03

Just got my hands on a Porta03. The tape transport wasn't working, flipped a belt and now it works grand. Someone must've put it on backwards last time it was open. Either way after fixing that, no audio out through the phones jack. Spent ages looking online for a service manual, and nothing. If anyone has a .pdf or a physical copy they're willing to scan it would be much appreciated.