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thank u so much for this manual that was so cheap that i thought it was a scam but i gambled anyway because it was too good of a deal to pass up and behold,the manual has everything and details of everything even the screws and im still amazed and very happy with my manual .so take my word and jump on it before they realize how cheap they selling thier manuals..thank you so much for taking time to read my thoughts
I do not have very much to say.
The price is quite covenient, delivery was better as promised (about 12 ours, against the specified 24 hours if I remember well), and the quality of the PDF is more than acceptable.
The Service Manual of Sansui R30 itself is also satisfactory: good graphic for schematics and layouts, simple and well structured.
Happy to find finally a schematic for this amplifier. The schematic is of good quality, the pcb layout is useless: all is black. Never the less, it is very easy to find the components on the board using the schematics.
Hard to find manual was ready the next day. Scans were very legible (including schematics). All the essential parts of the service manual were present (adjustment procedure, schematics, and parts list). It would have been nice if the rest of the manual was included (disassembly procedure, theory of operation, etc.).
The Service Manual for the Kenwood KR-V55R provided by owner-manuals.com was as described/advertised. The contents provided the necessary information to effect a diagnosis of the unit. The schematics above all else was instrumental in tracing the the signal flow from component to component.
3. ADVANTAGE OPERATION AND OF POWER AMPLIFIER CIRCUITRY SECTION
QThere is neccessity to decrease not the phase response till DC rangein order to increase the musicsignalresponse of extremely low frequencyrange. Therefore, amplifier is this employingno capacitors exceptonesfor phase compensation, and has an almostperfecttransient characteristics. OThe first stageFET(2SK97) a dual FETof even characterisis tics and has a large Cm and no-leakage currentat normal temparature. To avoid the influenceby temperature drift, such as center voltage(0V) deviation, this FETis used as differentialamplifier and operatesat cross point which is the optimum point of drain current(at about 3mA) against the temperature drift. QTransistors, TR05and TR07,the push-pull pre-driverstage functionsas currentdifferential amplifierthat the stabilized operationcan be obtained. In addition,the collector current of these transistors enough high to make linearity is excel lent. OSincethis Amplifier employsphaseadvancer circuits [C06, C08, C15, R29, C16 and R30J,which have not been frequently used,to compensate the phasecharacteristics on high frequencyrangeand is also made to have enough
current on each stage to increase the through-rate, the performance on high frequency range is conspicuously improved. OTo avoid the voltage deviation, regulatedpower supply circuit composedof ZD0'1, ZD02 is employed.
The use of differentialamplificationat first stagedual FET, (FET01, FET02) and connectionof the FETto the differential amplifier composedof TR01,TR02,make possibleto obtain enoughgainand remarkable low distortion. The output signalsof TR0'1 and TR02are untiphase. The output signalof TR02addsto TR05,on the other hand, the output phaseof TRO1 invertedbyTR03,then,it becomes is input signalof TR04and TROZwhich cascoded are connection. The output signals TR05and TR07are inphase at that the operationof this stageis push-pulldrive and currentdifferential amplification.The power amplifierof the f inal stageis composed of SEPP (SingleEnded push-pull)symmetry comple mentaryin 3-stage darlingtonconnectiontype. TR@and TR10arecomposing currentlimitercircuitto protect power transistor from break-down overload. by
4-1. Driver Circuit BoardAdjnstments (Seethe picture of top view on page 3.)
N o t e :1 . M a s t eV o l u m e . . . . . . r 1. Room Temperature. ......Minimum 3. For adjustment, run the unit for more than 3 minutesafter the power is switchedon.
suBfEcr ,or,r"r*, |
DC Volt Meter Sameas above
MEASURE OUTPUT Speaker Terminal Sameas above
ADfusr I oolrrr ro*
F-2721 vR01, vR02 F-2722 VRO1, VRO2 F-2721 VRO3
CONDITION " Set VR01 and VR02 to center oosition. o Then, for the purpose of proceeding the accurateadjustment, set the voltaeeto 0 volt by VR01first and V-RO2 next. o By turning VR03counterclockwise, the-bias current is decreased gradually.
D C0 V + 5 m V
T PT e r m i n a + ) ( - ) (l ot F-2721 of F-2723
Sameas above T PT e r m i n a + ) ( - ) (l