Panasonic SA-AK340EE Service Manual ▷ View online
12.3. Checking and Repairing of Panel, Deck & Deck Mechanism P.C.B.
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SA-AK340EE
12.4. Checking and Repairing of Power P.C.B.
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SA-AK340EE
13.1. Cassette Deck Section
· Measurement Condition
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− Reverse-mode selector switch:
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− Deck Tape Select: NORMAL
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− Make sure head, capstan and press roller are clean.
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− Judgeable room temperature 20 ± 5 °C (68 ± 9°F)
· Measuring instrument
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− EVM (DC Electronic voltmeter)
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− Digital frequency counter
· Test Tape
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− Tape speed gain adjustment (3 kHz, -10 dB);
QZZCWAT
13.1.1. Tape Speed Adjustment (Deck 1/2)
1. Insert the test tape (QZZCWAT) to DECK 2 and playback
(FWD side) the middle portion of it.
2. Adjust Motor VR (DECK 2) for the output value shown
below.
Adjustment target: 2910 ~ 3090 Hz (NORMAL speed)
3. After alignment, assure that the output frequency of the
DECK 1 FWD are within ±60 Hz of the value of the output
frequency of DECK 2 FWD.
frequency of DECK 2 FWD.
Fig. 1
13.1.2. 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 “l REC/STOP” key).
3. Measure and make sure that the output is within the
standard value.
Bias voltage for Deck 2
14±4mV (Normal)
Fig. 2
Fig. 3
13 Adjustment Procedures
13.1.3. Bias Frequency Adjustment (Deck 1/2)
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and set the unit to “REC” mode (l use “REC/STOP” key).
3. Adjust L1002 so that the output frequency is within the standard value as below.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and set the unit to “REC” mode (l use “REC/STOP” key).
3. Adjust L1002 so that the output frequency is within the standard value as below.
Standard Value: 89 ~ 110 kHz
Fig. 4
13.1.3.1. Cassette Deck Section
Below is the locations of test points for Deck P.C.B.:-
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SA-AK340EE
13.2. Tuner Section
This section include details on the alignment of AM-IF and AM RF adjustment.
13.2.1. AM-IF Alignment
1. Set up the equipments as shown in Fig. 5.
2. Select [TUNER] mode on selector and set to [AM] mode.
3. Apply signal as shown in Fig. 5 from AM-SG.
4. Adjust Z2602 accordingly so that the output frequency is maximized at 450kHz in Fig. 6.
2. Select [TUNER] mode on selector and set to [AM] mode.
3. Apply signal as shown in Fig. 5 from AM-SG.
4. Adjust Z2602 accordingly so that the output frequency is maximized at 450kHz in Fig. 6.
Fig. 5
Fig. 6
13.2.2. AM RF Adjustment
1. Set up the equipments as shown in Fig. 7.
2. Select [TUNER] on selector and set to [AM] mode.
3. Set AM-SG to 520kHz.
4. Receive 520kHz in the unit.
5. Adjust L2601 (OSC) so that the EVM-AC is maximized.
6. Set AM-SG to 600Hz.
7. Receive 600Hz in the unit.
8. Adjust L2601 (ANT) so that the EVM-SG is maximized.
9. Set AM-SG to 520kHz.
10. Receive 520kHz in the unit.
11. Adjust L2602 (OSC) so that the EVM-DC value is with 1.1±0.5V.
2. Select [TUNER] on selector and set to [AM] mode.
3. Set AM-SG to 520kHz.
4. Receive 520kHz in the unit.
5. Adjust L2601 (OSC) so that the EVM-AC is maximized.
6. Set AM-SG to 600Hz.
7. Receive 600Hz in the unit.
8. Adjust L2601 (ANT) so that the EVM-SG is maximized.
9. Set AM-SG to 520kHz.
10. Receive 520kHz in the unit.
11. Adjust L2602 (OSC) so that the EVM-DC value is with 1.1±0.5V.
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SA-AK340EE
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