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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This was the Sony CCU-500A Service manual I was looking for.
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Text excerpt from page 1 (click to view)
AV-21TS4ENS
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
AV-21TS4ENS(C)
JH
A new silver coloured model AV-21TS4ENS(C) has been added to the AV-21TS4EN(C) series. The new parts related to the silver coloured model are shown in the Parts Difference Table as AV-21TS4ENS(C)(SILVER). In regard to the parts not shown in the Table, refer to the AV-21TS4EN(C) Service Manual (No.51524D Aug. 2000) and AV-21TS4EN Service Manual (No.51524 Feb. 1999).
