Panasonic SC-AK48, Service Manual

Page: 37 / 104

13.2.4. Bias OSC Frequency Adjustment
(Deck 2)
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK2 and
set the unit to “REC” mode (use “ REC/STOP” key).
3. Adjust L1201 so that the output freguency is within the
standard value.
Standard value : 97±8kHz
Fig.11
13.2.5. Bias Voltage Check
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK2 and
set the unit to “REC” mode (use “ REC/STOP” key).
3. Measure and make sure that the output is within the
standard value.
4. Insert the CrO2 tape (QZZCRX).
5. Repeat step 2 and 3.
Standard value (Normal) : 14±4mV
Standard value (CrO2) : 17±5mV
Fig.12
13.2.6. Erase Voltage Check
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK2 and
set the unit to “REC” mode (use “ REC/STOP” key).
3. Measure and make sure that the output is within the
standard value.
4. Insert the CrO2 tape (QZZCRX).
5. Repeat step 2 and 3.
Standard value (Normal) : more than 80mV
Standard value (CrO2) : more than 90mV
Fig.13
13.2.7. Adjustment Point
Fig.14
37
SA-AK48