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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.
This manual was the factory original. Excellent value and contained all the details I needed. Easy dowwnload provided the information when I needed it.
Impeccable, document trΓ¨s complet. Perfect, i get all i need. All schematic are correct. Thanks
TUNER SECTION [AM] BAND switch : AM
NOTE: The adjustment should be performed setting the area indication to âEurâ. (Refer to âReceiving Stations Outside Your Countryâ on page 3.) After the adjustment, reset the area indication as it was. AM RF SSG Put the lead-wire antenna close to the set. 30% amplitude modulation by 400Hz signal output level : as low as possible AM VT VOLTAGE ADJUSTMENT Adjust for following values on digital voltmeter. Display indication Digital voltmeter reading Adjustment part AM531 kHz 1.5V T1
AM VT VOLTAGE ADJSTMENT BAND switch : AM digital
voltmeter TP22 (VT)
[FM] BAND switch : FM
FM RF SSG 0.01ÂµF 22.5kHz frequency deviation by 400Hz signal. output level : as low as possible
[FM VCO Adjustment] Procedure :
FM RF SSG 0.01ÂµF Carrier frequency : 98MHz Modulation : no modulation to ANT (TP1) VTVM 32 output level : 0.1V (100dB) to ANT (TP1)
1. Connect frequency counter to the positions shown below. 2. Tune the to 98 MHz. 3. Adjust RV1 for 19 kHz Â± 100Hz reading on the frequency counter.
frequency counter TP23 (IC2 Pin !â¢) 1ÂµF 100k (IC2 Pin 9)
â¢ Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.
AM IF ADJUSTMENT Adjust for a maximum reading on VTVM. T2 450 kHz
Adjustment Parts Location
AM TRACKING ADJUSTMENT Adjust for a maximum reading on VTVM. L5 CT1 FM IF ADJUSTMENT Adjust for a maximum reading on VTVM. L3 10.7 MHz 621 kHz 1,395 kHz
[TUNER BOARD] â Component side â
T2 : AM IF T1 : AM VT TP23 TP22 L5 : AM TRACKING
RV1 : VCO
L3 : FM IF CT1 : AM TRACKING