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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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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
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IC DESCRIPTION
IC, TMP47C443LDM-1B45(EL) Pin No.
1 2 3 4 5 6 7 8 9 10 11 12 ~ 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Pin Name
XOUT XIN RESET EJECT SW BUZR TEST HOLD NC L.V.STOP MAIN IN REMOTE IN NC POWER ON GND PHOTO OUT LOAD CTL MOT ON MOT DIR BRAKE MOT HI MOT CH NC P-SNSR C-SW AUTO SW F/R CTRL MUTE WAKE UP VDD
I/O
O I I I O I I � I I I � O � O O O O O O I � I I I O O I � Connected to 4MHz crystal oscillator. Input reset signal. Input EJECT SW."H": OFF, "L": ON. Output buzzer sound.
Description
Input test mode. "H": Test ON. (Connected to GND). Input HOLD SW. "H": OFF, "L": ON. Connected to GND. Input reducing voltage detection. "L": Mecha STOP. Input key from main unit (A/D). Input key from remote controller (A/D). Not connected. Output power for audio circuit. "L": ON. Connected to GND. Microcomputer detection P-SNSR level output pin. Output for voltage supply checking. "L": Check. Output motor activation. "L": ON. Output motor rotating direction. "L": Counterclockwise. Output motor brake. "L": ON. Output motor hi-speed activation. "L": ON. Input motor activation detection. Connected to GND. Input sensor waveform. Input cassette tape detection. "H": Not exist, "L": Exist. (Connected to GND). Input AUTO SW. "H": AUTO operation, "L": NO AUTO operation. Output FWD, REV control. "L": REV. Output muting. "L":ON. Input micro-computer OSC ON. Power supply (+3V).
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