Panasonic AG-MD830E Service Manual

4-3-24. AUDIO LEVEL METERADJ.BOARD AUDIO C.B.A.TP AUDIO LEVEL METERADJ CH1 : VR4505(B-3), CH2 : VR4506(B-3)TAPEINPUT 1KHz,-8dBv SINEWAVE SIGNALMODE STOPM.EQSPEC Hi-Fi: OdB, NORM: OdBNote: This adjustment should be performed onlyafter completion of 4-3-23.PRE-AMPLlFIERADJ.1. Set the audio output select switch to Hi-Fi mode.2. Set the Hi-Fi audio level control VR (CH1, CH2)on the Front Panel to the centre click position.3. Supply 1 KHz, -8dSv sinewave signal to audioinputs (CH1, CH2).4. Adjust VR4505 (CH1) and VR4506 (CH2) so thatthe Audio Level Meter shows OdS as shown inFigure E23.AUDIO LEVELMETERI::JI::J 6 I::JI::JI::J 3 I::JI::J I::J- 0-- -3 -- -LIGHT- -6 -LIGHT- ---10---00-Figure E234-3-25. NORMAL AUDIO FREQUENCYRESPONSE ADJ.BOARD AUDIO C.B.A.TP AUDIO OUTPUT (CH1 ,CH2)ADJ CH1: VR4OO1 (B-1), CH2: VR4D03(B-1)TAPE VFM8180HADH, PORTION: 3INPUTMODE PLAYM.EQ OSCILLOSCOPESPEC 400Hz = 5kHz (± O.5dB)1. Set the VR4002 and VR4004 to centre position.2. Set thte Aduio output select switch to NORM.3. Connect a scope to Audio Outputs (CH1, CH2).4. Adjust VR4001 (CH1) and VR4003 (CH2) so thatthe 400Hz and 5KHz levels becomes the same (0± 0.5dS) as shown in Figure E24.Note: After this adjustment is finished, adjust 4-3-26. Normal Audio PS Gain Adj.400Hzr----1 5kHzr1Figure E244-3-26. NORMAL AUDIO PLAYBACKGAIN ADJ.BOARD AUDIO P.C.B.TP CH1, CH2 AUDIO OUTPUTADJ CH1 : VR4D02(B-1), CH2 : VR4D04(B-1)TAPE VFM8180HADH, PORTION: 3INPUTMODE PLAYM.EQ OSCILLOSCOPESPEC 300mVp-p ± 15mVNote: This adjustment should be performed onlyafter completion of 4-3-25. Normal AudioFrequency Responce Adj.1. Set the audio output select switch to NORM.2. Connect the a scope to audio outputs (CH1 ,CH2).3. Playback the alignment tape (Portion: 3).4. Adjust VR4002 (CH1) and VR4004 (CH2) so thatthe levels become 300mVp-p ± 15mV as shown inFigure 25.AUDIO OUTPUTs(CH" CH2) ,------- 400HzFigure E254-11~zw:2!l-tn:::>-.,c«...J«()a:l-t)W...JW