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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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1.5 DISASSEMBLY/ASSEMBLY OF 8 LOWER CASE ASSY When performing disassembly/assembly work to this model, the parts that are most complicated and require special attention are the E. VF UNIT and the OP MDA BOARD ASSY, OP BLOCK ASSY and SHOE ASSY, all of which are mounted inside the LOWER CASE ASSY. Care should be taken in handling these parts as they are mounted inside the LOWER CASE ASSY (except the E.VF UNIT) and there is a lack of adequate space to work conveniently. This section gives further details regarding the disassembly procedures, although they have been described in previous sections. 1. See Fig. 1-5-1. (1) While moving the ! MICROPHONE out of way, remove the screw (39) and take out the @ OP BLOCK ASSY. (2) Remove two screws (40, 41) and open the $ OP MDA BOARD ASSY.
41 (S 14 a) 40 (S 14 a) CN 13
(3) Remove two screws (42, 43) to disconnect the connector (CN203), then take out the FPC to remove the # E. VF UNIT. NOTE #a : Be careful not to damage the FPC or the
switches when carrying out this work.
2. See Fig. 1-5-2. (1) Remove the two screws (44, 45) in order to free the $ OP MDA board assembly. (2) Remove the two screws (46, 47) and take out the $ OP MDA BOARD ASSY together with the @ OP BLOCK ASSY and the % SHOE ASSY. NOTE@:
Be careful not to lose the KNOB(VIDEO/DSC), which may slip out during the disassembly.
(3) Disconnect the FPCs from the connectors on the @ OP BLOCK ASSY and the % SHOE ASSY.
NOTE 13 b 13
42 (S 13 a) 8 14 NOTE 13 a 43 (S 13 b)
11 NOTE 11
NOTE 13 a
OP MDA PWB SW
39 (S 12 )
46 (S 15 ) 47 (S 15 ) NOTE 15 15 12 KNOB (VIDEO /DSC) NOTE 12 CN 15 45 (S 14 b) CN 12 44 (S 14 b)
14 NOTE 14 b
Fig. 1-5-2 1-9