Panasonic SA-VK880PU, Service Manual

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12.3.
Bias Voltage Check
1. Connect the electrical voltmeter to Pin 3 (signal) & Pin 1 (ground) (Figure 5).
2. Set to “TAPE” mode.
3. Insert a normal blank cassette tape (QZZCRA).
4. While pressing and holding down [
O
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
Figure 5
12.4.
Bias Frequency Check
1. Connect the digital frequency counter to Pin 3 (signal) & Pin 1 (ground) (Figure 6).
2. Set to “TAPE” mode.
3. Insert a normal blank cassette tape (QZZCRA) and press [
O
REC] on main unit.
4. Check that the output frequency is within the standard range (standard value: 100±8kHz).
Figure 6