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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+++++++++++++++++++++++++
TK-378G
ADJUSTMENT
Common Section
Item 1. Setting Condition 1) BATT terminal voltage:7.5V 2) SSG Standard modulation [Wide] MOD:1kHz, DEV:3kHz 2. VCO lock voltage RX TX [Narrow] MOD:1kHz, DEV:1.5kHz 1) CH:RX High Power meter 2) CH:RX Low DVM 3) CH:TX High PTT:ON 4) CH:TX Low PTT:ON ANT CV(LV) TC2 ADJ Check ADJ Check 4.0V ± 0.1V 0.8V or more 4.0V ± 0.1V 0.8V or more Measurement Test equipment Terminal Adjustment Parts Method Specifications/ Remark
TC1
Transmitter Section
Item Condition Measurement Test equipment Terminal Freq. Counter Power meter Am meter ANT VR1 PC key Adjustment Parts Method Center frequency ± 100 Hz 4.2W ± 0.1W 2.2A or less Specifications/ Remark 1. Frequency 1) TEST CH:TX Center Adjust PTT:ON 2. High Power TEST CH: TX Low Check TX Low� Adjust TX Center (PC MODE) TX High� TX High Battery terminal voltage:7.5V PTT:ON 3. Low Power TEST CH: TX Low Adjust TX Low� (PC MODE) TX Center TX High� TX High Battery terminal voltage:7.5V PTT:ON 4. Max DEV TEST CH: TX Low Adjust TX Center (PC MODE) TX High [Wide] AG:1kHz / 120mV Deviation meter filter LPF:15kHz HPF:OFF PTT:ON [Narrow] TEST CH:TX Center PTT:ON 5. External CTCSS Input Balance Adjust AG:20MHz (Square waves) /600mVpp Deviation meter filter LPF:15kHz HPF:OFF M)151.0MHz M4)143.0MHz PTT:ON 6. QT TCXO TEST CH: TX Low Balance TX Center (PC MODE) TX High [240] (Wide/Narrow) PTT:ON
1.0W ± 0.1W 1.0A or less
Deviation meter Oscilloscope AG AF VTVM
ANT SP/MIC connector
4.2kHz (According to the larger +,-)
±50Hz
Deviation meter Oscilloscope AG
ANT CN6(CT IN)
VR3
2.1kHz (According to the larger+,-) Make the demodulation waves into square waves.
Deviation meter Oscilloscope AG AF VTVM
ANT SP/MIC connector
PC key
14
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