Going for a drive… with a printer?

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Guru dumped Namco’s System 12 Techno Drive recently. I got it to boot in MAME and go into the service menu, but it won’t play because it’s missing an odd arcade peripheral: a printer. (The board set that we dumped from is also missing the printer).
Either photos of a fully intact boardset or the service manual would likely be helpful in figuring out what’s going on. Please buzz me on Mameworld or forums.bannister.org if you’ve got either of those.

UPDATE: Thanks to some info from ShouTime, we found the printer disable switch.