Panasonic SA-PM29P, Service Manual

Page: 59 / 152

Fig. 11
15.1.5 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: 14 ± 4mV
Fig. 12
15.1.6 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.
Fig. 13
Standard Value: 98 ±8 kHz