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 15 (click to view)
AY/AE-A079E AY/AE-A099E
Table Y-6 [AY-A079E]
Lamps Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Output for outdoor unit OFF Compressor Reverse Valve Outdoor Fan Motor OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF (Back to step 1) 1 : 7�C : 7�C 2 : �2�C : �2�C 3 : 0.1V : 0.1V Room temp. 42�C (Room temp.) or (Room temp.) Pipe temp. 42�C (Pipe temp.) or (Pipe temp.) ON OFF ON OFF ON OFF RED 1 Flickering ON ON ON OFF OFF OFF OFF OFF OFF ON OFF ON ON ON OFF OFF OFF ON OFF ON OFF OFF OFF OFF ON OFF OFF OFF ON ON OFF OFF OFF OFF OFF ON ON OFF YELLOW 2 ON OFF ON OFF 3 4 Indoor Fan motor OFF D H L D UL H M L OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF Louver
OPEN OFF OFF CLOSE OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
42�C
42�C
(P57 input voltage) 0.45V (P57 input voltage) or (P57 input voltage
0.45V)
4 : When Power on start is effective, Timer LED(yellow) is ON.
