Panasonic SA-VK950EE Service Manual ▷ View online
13.2. Checking and Repairing of SMPS P.C.B. & Digital Amp P.C.B.
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SA-VK950EE
13.3. Checking and Repairing of Panel, Deck & Deck Mechanism P.C.B.
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SA-VK950EE
14.1. Cassette Deck Section
· Measurement Condition
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− Reverse-mode selector switch:
−
−
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− Tape edit: NORMAL
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−
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− Make sure head, capstan and press roller are clean.
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−
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− Judgeable room temperature 20 ± 5 °C (68 ± 9°F)
· Measuring instrument
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− EVM (DC Electronic volmeter)
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−
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− Digital frequency counter
· Test Tape
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− Tape speed gain adjustment (3 kHz, -10 dB);
QZZCWAT
14.1.1. Head Azimuth Adjustment (Deck
1/2)
Caution:
· Please replace both azimuth adjustment screw and springs
· Please replace both azimuth adjustment screw and springs
simultaneously when readjusting the head azimuth. (shown
in Fig. 2) Even if you wish to readjust the head azimuth
without replacing the screws and springs, a fine adjustment
to the azimuth screw and spring.
in Fig. 2) Even if you wish to readjust the head azimuth
without replacing the screws and springs, a fine adjustment
to the azimuth screw and spring.
· Please remove the screw-locking bond left on the head
base when replacing the azimuth screw.
· If you wish to readjust the head azimuth, be sure to adjust
with adhering the cassette tape closely to the mechanism
by pushing the center of cassette tape with your finger.
(shown in Fig. 3)
by pushing the center of cassette tape with your finger.
(shown in Fig. 3)
1. Playback the azimuth adjustment portion (8 kHz, -20dB) of
the test tape (QZZCFM) in the forward play mode. Vary the
azimuth adjustment screw until the output of the R-CH (PB
OUT-R) are maximized.
azimuth adjustment screw until the output of the R-CH (PB
OUT-R) are maximized.
2. Perform the same adjustment in the reverse play mode.
3. After the adjustment, apply screwlock (NEJI-LOCK) to the
3. After the adjustment, apply screwlock (NEJI-LOCK) to the
azimuth adjusting screw. Screw-Lock applied on the screw
must be more than 180° around screw.
must be more than 180° around screw.
14.1.2. 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
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 shown
below.
Adjustment target: 2910 ~ 3090 Hz (NORMAL speed)
4. After alignment, assure that the output frequency of the
DECK 1 FWD are within ±90 Hz of the value of the output
frequency of DECK 2 FWD.
frequency of DECK 2 FWD.
Fig. 1
14.1.3. Bias Voltage Check
1. Set the unit “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
the unit to “REC” mode (use
key).
3. Measure and make sure that the output is within the
standard value.
Bias voltage for Deck 2
14±4mV (Normal)
14 Adjustment Procedures
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SA-VK950EE
Fig. 2
Fig. 3
No adjustment is required.
14.3.1. Cassette Deck Section
14.1.4. Bias Frequency Adjustment (Deck
1/2)
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
set the unit to “REC” mode (use
key).
3. Adjust L1002 so that the output frequency is within the
standard value.
Standard Value: 89 ~ 110 kHz
Fig. 4
14.2. Tuner section
14.3. Alignment Points
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SA-VK950EE
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