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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No sound from built-in both L-CH and R-CH Speakers
Check that there is an audio signal to the Audio Out Terminal from all input terminals. (All input are NG.) (Only Audio1 OR Audio2 input is NG.) Replace the OPT/TV Unit
Replace the Rear Jack P.C.B.
(Only Audio3 input is NG.)
Replace the Rear Jack P.C.B. or Front Jack/Operation P.C.B.
(Only Tuner input is NG.) (Only Component 1 OR Component 2 input is NG.)
Replace the OPT/TV Unit or Tuner P.C.B.
Replace the Rear Jack P.C.B.
OK Replace the OPT/TV Unit or Power P.C.B.
No sound from built-in L-CH Speaker only
Press MENU key on the remote and select "Audio" in MENU screen. Then press "OK."
Does the "BALANCE" screen becomes center position? NO Set to the center position. Still NG Swap the Speaker Connectors to confirm the Speaker failure. NO Replace the OPT/TV Unit. YES
Replace the L-CH Speaker.
No sound from built-in R-CH Speaker only
Press MENU key on the remote and select "Audio" in MENU screen. Then press "OK."
Does the "BALANCE" screen becomes center position? NO Set to the center position. Still NG Swap the Speaker Connectors to confirm the Speaker failure. NO Replace the OPT/TV Unit. YES Replace the R-CH Speaker.
