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These handy Quick Reference Guides are PDF's that I made myself but are based on the original Service Manuals.
They typically contain diagrams, handy circuit board layouts that I made, instructions, partlists and other information not found in the Service Manual.
The QRG's are is useful when servicing the reel-to-reel tape deck in question.
These QRG's are to be used alongside the Service Manual.
As these QRG's are constantly updated with new information and errata, be sure to download the latest version each time you need them.