Panasonic SA-AK230PL Service Manual

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Contents

Panasonic SA-AK230PL Service Manual Manual pdf 46 page image

13.1. Cassette Deck Section· Measurement Condition−−−− Make sure head, capstan and press roller are clean.−−−− Judgeable room temperature 20 ± 5 °C (68 ± 9°F)· Measuring instrument−−−− EVM (DC Electronic voltmeter)−−−− Digital frequency counter· Test Tape−−−− Tape speed gain adjustment (3 kHz, -10 dB);QZZCWAT13.1.1. Tape Speed Adjustment (Deck 1/2)1. Set the tape edit button to “NORMAL” position.2. Insert the test tape (QZZCWAT) to DECK 2 and playback(FWD side) the middle portion of it.3. Adjust Motor VR (DECK 2) for the output value shownbelow.Adjustment target: 2940 ~ 3060 Hz (NORMAL speed)4. After alignment, assure that the output frequency of theDECK 1 FWD are within ±60 Hz of the value of the outputfrequency of DECK 2 FWD.Fig.113.1.2. Bias and Erase Voltage Check1. Set the unit “AUX” position.2. Insert the Normal blank tape (QZZCRA) into DECK 2 andthe unit to “REC” mode (use “l REC/STOP” key).3. Measure and make sure that the output is within the1. Connect the instrument as shown in Fig.5.2. Set the unit to AM mode.3. Apply signal as shown in Fig. 5 from AM-SG.4. Adjust Z2602 so that the output frequency is maximized inFig. 6.standard value.Bias voltage for Deck 2 14±4mV (Normal)Erase voltage for Deck 2 80mV (Normal)Fig.2Fig.313.1.3. Bias Frequency Adjustment (Deck1/2)1. Set the unit to “AUX” position.2. Insert the Normal blank tape (QZZCRA) into DECK 2 andset the unit to “REC” mode (l use “REC/STOP” key).3. Adjust L1002 so that the output frequency is within thestandard value.Standard Value: 97 ±8 kHzFig.4Fig.513 Measurements and Adjustments13.2. Tuner Section13.2.1. AM-IF Alignment46SA-AK230PL