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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+++++++++++++++++++++++++
6-2
6-2
TUNER BOARD - LAYOUT DIAGRAM
TUNER ADJUSTMENT TABLE
Waverange Input frequency Input Tuned to Adjust Output Scope/Voltmeter
VARICAP ALIGNMENT FM 87.5 - 108MHz MW
FM/AM-version, 10kHz grid
108MHz 87.5MHz 1700kHz 530kHz 1602kHz 531kHz
L303 check T301 check T301 check
4V �0.2V 0.9V �0.2V
1
3.4V - 3.5V 0.6V - 0.7V 3.6V - 3.7V 0.6V - 0.7V
530 - 1700kHz
FM/MW-version, 9kHz grid
531 - 1602kHz FM IF FM FM RF FM 87.5 - 108MHz 108MHz 87.5MHz AM IF
A
mod=1kHz �f=�22.5kHz
108MHz 87.5MHz
L302
4
MAX
C
MW 450kHz �f=�10kHz VRF = 0.5mV
(as low as possible)
558kHz (or 560kHz)
T301
4
fo symmetric
AM RF MW
FM/MW-version, 9kHz grid
1494kHz 558kHz 1500kHz 560kHz
B
1494kHz 558kHz 1500kHz 560kHz
TC302
max. fo symmetric
ECO6, general with ferrite antenna, 070799
531 - 1602kHz MW
FM/AM-version, 10kHz grid
MW ferrite coil
4
530 - 1700kHz
�f = �30kHz VRF as low as possible
TC302
MW ferrite coil
1) If sensitivity of frequency counter is too low adjust to max. channel separation
2) RC network serves for damping the IF-filter while adjusting the other one.
(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)
Repeat
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