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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, MC68HC05P6SCD2776
Pin No. 1 2 3 4 Pin Name SYSTEM RESET WAKE UP SYSTEM AGC CONT INPUT SEL 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 AUD MUTE TIME SEL
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ELECTRICAL ADJUSTMENT
I/O I I � I Initializes the system. Low input.
Description
Detects the key input and starts up the system. Low input. System selector (setting each model). High: 8RC-9. AGC control. High: OFF. Low: ON. High: TAPE. Low: MIC. Audio mute. Setting the recording time in the L/L mode. High: ON. Low: OFF. High: 10 sec. Low: 45 sec.
I/O I/O I O I/O I/O O I I/O � � I I I I I/O I I I � I I/O I/O I
RADIO/MIC DO DI SK CS ISD MOSI ISD MISO SCLK VSS VREF BAT IN PB/REC KEY STOP/REW KEY FF KEY ISD SS LED PB LED REC ISD RAC TCMP ISD INT OSC2 OSD1 VDD
System setting by selecting signal. High: RADIO (PAUSE). Low: MIC (OFF). Data input from EEPROM. Data output to EEPROM. System clock to EEPROM. System selector to EEPROM. Data output to ISD. Data input from ISD. System clock of ISD. GND. 0 V. Reference voltage to A/D converter. 3.3 V TYP. Battery voltage input. (for voltage identification). 8RC-9: BAT IN. PB/REC KEY input. 2/3 VCC PB. 1/2 VCC REC. STOP/REW KEY input. 2/3 VCC STOP. 1/2 VCC REW. FF KEY input. Low: FF. ISD system selector. PB LED. REC LED. ISD RAC input. Not used. ISD INT input. 2.0 MHz ceramic filter. 2.0 MHz ceramic filter. Power supply input.
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