Panasonic SA-PM31PC - Cassette Deck Performance Checks; Bias Voltage Check; Bias Frequency Check

Fig. 10
Fig. 11
13.2.5. Bias Voltage Check
1. Connect an electrical voltmeter. (Cf. Fig. 9) (Cf. Fig. 12)
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: 13.5 ± 4mV
Fig. 12
13.2.6. Bias Frequency Check
1. Connect a digital frequency counter (Figure 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-PM31P / SA-PM31PC