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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+++++++++++++++++++++++++
KAC-7202/7252
BLOCK DIAGRAM
ISO AMP L LINE IN L LINE OUT R LINE OUT R LINE IN HPF 50-200Hz BASS BOOST 40-100Hz MUTE SP OUT R MO/ST SENS IC12,16 LPF/OFF/HPF IC1(X08) HPF 50-200Hz IC3(X08) LPF 50-200Hz IC7-9,13,15 BASS BOOST 40-100Hz MUTE SP OUT L POWER AMP Q241,242 Q201-258
IC1 L SP IN R SP IN
REMOTE CONTROL f, GAIN f=40-100Hz GAIN=0-18dB 15V AVR
CONTROL
P-CON
BATT D.D. CON. GND
COMPONENTS DESCRIPTION
� PREAMPLIFIER UNIT (X08-4190-1x)
Ref. No. IC1 IC2 IC3 IC4~6 IC7 HPF Phase reversal amplifier (Lch only) LPF Bass-boost circuit Bass-boost mixing amplifier Application / Function Ref. No. Q101 Q201~204 Q209,210 Q205~208 Q211,213 Q220,222~227,229 Q241,242 Q251~258 Application / Function Remote controller reference voltage Power amplifier initial step differential driving Current limiter Power amplifier second step differential driving Temperature detection for idling Power amplifier final Power amplifier mute Power amplifier driver Power amplifier ATT (-3dB) Power-ON shock preventer circuit P-Con OFF detection Mute drive P-Con control circuit Excess voltage detection Temperature detection control circuit Fan power supply Excess current detection DC detection DC detection for latch For LED control Temperature detection control circuit
� AUDIO UNIT (X09-5830-1x)
Ref. No. IC1,12,16 IC5 IC6 IC7,8 IC9 IC13 IC15 Q1,2 Q3~8 Q9~12 Q13,14 Application / Function Input isolation amplifier DC/DC converter Temperature detection comparator For adjusting bass-boost f For adjusting bass-boost gain Bass-boost phase shifter Bass-boost mixing amplifier ±15V AVR DC/DC converter FET DC/DC converter FET driver For controlling DC/DC converter FET driver
Q280,282 Q601,615~618 Q602 Q603 Q604,605 Q606 Q607,608,619,620 Q609 Q610 Q611,612 Q613,614 Q621,622 Q623
ADJUSTMENT
No. ITEM IDLE CURRENT ALIGNMENT POINT VR1 (Lch) VR2 (Rch) METHOD Connect a DC voltmeter between check land (Refer to PC BOARD) 2.5mV ALIGN FOR NOTE After Power on 5 minutes
1
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