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.
Text excerpt from page 17 (click to view)
ASPM, summary operation
Hold down the ASPM button for 3 more second.
Preset CH memory full over? No operate. After displayed �END�. Return to previous station. No Yes Preset CH memory become full over? Begin to scan start 87.50 � 108.00 MHz
Displayed the TTL quantity of memo�ASPM� blinks in the display. rized stations by ASPM operation on this time. And return to the previous receiving freq. automatically. Yes
No SD (TUNE) DET out OK? Begin to ASPM SCAN from the next No effect
No Pass
Yes CH-SPAN again.
If count 1st OK? No effect
No Pass
Yes Repeat and continue with same format ASPM operation untill 108 MHz. No effect TTL quantity of memorized stations. And return to the previous receiving No effect Effect Memorized to the lowest PI cord Comparing freg. same or not?
� 17 � No effect signal. Is receiving signal No preset memory ahead of this receiving Yes and (already) previously memorized Yes No effect frequency.
If count 2nd OK? After reached 108 MHz, displayed the
No Pass
Yes
RDS signal or not? PI�identify
No freq. automatically. Pass
Yes
No
PI and between current receiving frequency vacant preset channel. before PI which is already and (already) previously memorized by ASPM on this time. frequency.
Yes
Compare the field strength of current
No No effect
CD-C1H/CP-C1H
stronger than signal which has same PI cord and is already memorized to Comparing freg. same or not? Memorized to the lowest time? Between current receiving frequency vacant preset channel.