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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!
A+++++++++++++++++++++++++
IC, TMP87PH47U
Pin No. 1 2 3 4 5 Pin Name KY OUT 4 KY OUT 3 KY OUT 2 KY OUT 1 FREQUENCY 1 VOL 1 VOL 1 6 7 8 9 10 11 12 13 14 15 16 17 18 19 VOL 0 KY IN 6 KY IN 5 KY IN 4 KY IN 3 KY IN 2 KY IN 1 TEST RESET XIN XOUT VSS VREF LCD RS COMBO CLK LCD RW 20 COMBO DATA EP DATA 21 22 23 24 25 26 27 28 BAT DET EP CLK LCD DB 4 LCD DB 5 LCD DB 6 LCD DB 7 COMBO STB TX DATA I O I/O I/O I/O I/O O O I/O O I I I I I I I I I O � I O VOL 0 I/O O O O O I/O Keypad column output 4 Keypad column output 3 Keypad column output 2 Keypad column output 1 1 = 25CH, 0 = 10CH 4 (Max.) 1 1 3 1 0 2 0 1 1 (Min.) 0 0 Description
Keypad column input 6 Keypad column input 5 Keypad column input 4 Keypad column input 3 Keypad column input 2 Keypad column input 1 Tied to low Normaly High, low to reset MCU Resonator in (4.0 MHz) Resonator out (4.0 MHz) Ground A/D Reference voltage input (3.0V) LCD Control (Resister select Combo chip CLOCK LCD Control (0 = Write, 1 = Read) Combo chip DATA EEPROM DATA Battery voltage input EEPROM CLOCK LCD DATA 4 LCD DATA 5 LCD DATA 6 LCD DATA 7 Combo chip STB Transmitted DATA Received Signal Strength Indicator 0 = Instruction resister, 1 = Data resister)
29
SIG OUT
I
0 = Carrier present, 1 = Carrier absent 0 = RX unlock, 1 = RX lock 0 = TX unlock, 1 = TX lock
30 31 32 33 34
CHG DET RX DATA TX PWR BPTONE RX PWR
I I O O O
Charger detect 1 = Charging, 0 = Not charging Received DATA TX Power control 0 = ON, 1 = OFF Buzzer signal RX Power control 0 = ON, 1 = OFF
21
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