The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Text excerpt from page 19 (click to view)
CDX-R5515X/R5610/R6550
2-15. SPRING (S)
5 spring (S)
Note for assembly
display (SV) assy
display (SV) assy dowel spring (S)
3 Take off the spring from the dowel on preset assy side. 4 spring (S)
preset assy
1 Raise the preset assy up in the arrowed direction.
Make sure the spring is not off from the dowel.
display (SV) assy dowel spring (S)
2 Take off the spring from the dowel on preset assy side.
Put preset assy back in the arrowed direction.
preset assy Make sure the spring is not off from the dowel.