Sanyo VHR-120 Series Service Manual

31 COJ21(N) lRelay jig (VHJ-0084)= ~CN06 for connector(1) from ACE headP CN101CN201ble)Ie)P1OJO11SlitsACE headFig. 2-1-3PoaJol2ectornectorPre-amRelay jig (VHJ-FlatFig. 2-1-42-1-3. SET-UPBecause the RF input signal is used for circuit adjustments,connect the colour-bar generator to the ANT IN terminal ofthe VCR. The RF input signal is processed by the tuner andIF circuit. It is improtant that the video output signal of the IFcircuit satisfies the items shown in Fig. 2-1-5. Connect the.oscilloscope to the VIDEO OUTPUT terminal of the videocircuit and terminate with a 75Cl load, and then check thevideo output signal.“ The amplitude of the sync signal should be approxi-mately 0.3 Vp-p.o The amplitude of the video signal should be approxi-mately 0.7 Vp-p.. While observing the oscilloscope or TV screen, makefine-tuning adjustments so that the colour burstamplitude is approximately 0.3 Vp-p.—3—“ Check to be sure that there is no spike noise in the syncpart of the horizontal sync signal.W05JO01white > ,,-1 ‘‘ k ~ 1104‘m ~7~0.7Vp-p0.3 Vp-po~ ~ >olour burst 0.3 Vp-p~-H sync signalFig. 2-1-5