Panasonic SB-AK450, Service Manual

Page: 51 / 105

Fig. 10
Fig. 11
14.1.5. Bias Voltage Check
1. Connect an electrical voltmeter. (Fig 12) (Fig 9 for location of test points)
2. Set the function to “TAPE” position.
3. Insert a normal blank cassette tape (QZZCRA).
4. While pressing and holding down [REC (
/ )] button, press [TAPE ( )] button to pause the recording mode. (Repeat
pressing the buttons till the recording pause mode is activated.)
5. Check that the output level is within the standard range.
Standard Range: 16 ± 3mV
Fig. 12
14.1.6. Bias Frequency Check
1. Connect a digital frequency counter (Fig 13).
2. Set the function to “TAPE” position.
3. Insert a normal blank cassette tape (QZZCRA) and press “REC” mode on main unit.
4. Check that the output frequency is within the standard range.
Standard Value: 98 ±8 kHz
Fig. 13
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SA-AK450P / SA-AK450PC