Help with Tascam 34 Repro Playback Missing Track 1

[hco7777]

Hi All, I'm very new to analog reel to reel recording, so apologies for any stupid mistakes or misunderstandings on my part. I just bought a Tascam 34 and have been enjoying working with it, however, there seems to be an issue with the "Repro" output selector - it doesn't recognize or playback anything on track 1. The VU meter doesn't move and no sound comes out. If I switch it over to "Sync" for the output, then I can hear what's on track 1 and the VU meter comes to life. Has anyone else had this problem and/or know of a way to fix this? In the meantime, are there any issues or problems with doing playback primarily in Sync output? Many thanks for any help!