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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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This was the Sony CCU-500A Service manual I was looking for.
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Excellent printing quality.
A complete and very usefull service manual with all details.
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Setting the Unit
Gain Control Subsonic Select Switch (PRS-X720 and PRS-X320) If the sound level is too low, even when
The subsonic filter cuts inaudible frequencies below 15 Hz to eliminate unwanted vibrations and minimize power loss.
8.1 OPERATIONS
volume of the car stereo used along with this power amplifier is turned up, turn gain control on back of the power amplifier clockwise. If the sound distorts when the volume is turned up, turn the gain control counter-clockwise.
� When using with an RCA equipped car
stereo (standard output of 500 mV), set to the NORMAL position. When using with an RCA equipped Pioneer car stereo with max. output of 4 V or more, adjust level to match the car stereo ouput level.
Bass Boost Level Control Cut Off Frequency Control
8. OPERATIONS AND SPECIFICATIONS
Bass level control can boost the level around the frequency selected by If the LPF/HPF select switch is set to the bass boost frequency control from 0 LPF (or HPF), you can select a cut off to 18 dB. frequency from 50 to 120 Hz.
Bass Boost Frequency Control (PRS-X720 and PRS-X320) LPF (Low-Pass Filter)/HPF (High-Pass Filter) Select Switch
You can select a bass boost frequency from 40 120 Hz with bass boost Set LPF/HPF select switch as follows according to the type of speakcontrol. er that is connected to speaker output connector and the car stereo system: � Level Control and Bass Boost LPF/HPF Select Audio frequency range Speaker Remarks position other than HPF. Switch to be output Type
LPF (left) * � 50 to 120 Hz Sub-woofer Connect a sub-woofer. OFF (center) Full range HPF (right) * 50 120 Hz � Full range Use if you want to cut the Power Indicator very-low-frequency range*
Frequency Control can be adjusted only when the LPF/HPF select switch is set to a
The power indicator lights when the because it is not necessary power is switched on. for the speakers you are
using. * See the �Cut Off Frequency Control� section.
PRS-X720,X320,X220
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