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 48 (click to view)
ELECTRICAL TROUBLESHOOTING GUIDE -1/17 1. Power Circuit(SMPS) (1) No 5.4VA.
No 5.4VA. YES Is the F101 normal? YES Is the BD101 normal? YES Is the R101 normal? YES Does the oscillation waveform appear at the IC101 Pin 7? YES NO Is Vcc(about 13~15V) permittable at the IC101 Pin 3? NO Check or Replace the D103. NO Replace the R101. NO Replace the BD101. NO Replace the F101 (Use the same Fuse).
Is there DC voltage at the IC101 Pin 4? YES Is there about 2.5V at the IC103 Vref ? YES Is the D106 normal? YES Check the Main C.B 5.4VA Line short?