Panasonic SA-AK52, Руководство по обслуживанию, Страница: 21 / 80

12.1.2. Tape Speed Adjustment (Deck 1/2)
1. Set the tape edit button to “NORMAL” position.
2. Insert the test tape (QZZCWAT) to DECK 2 and playback
(FWD side) the middle portion of it.
3. Adjust Motor VR (DECK 2) for the output value shown
below.
Adjustment target: 2940 ~ 3060 Hz (NORMAL speed)
4. After alignment, assure that the output frequency of the
DECK 2 REV and DECK 1 FWD are within ±45Hz and ±60
Hz respectively of the value of the output frequency of
DECK 2 FWD.
12.1.3. Bias and Erase Voltage Check
1. Set the unit “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
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.
Bias voltage for Deck 2 14 ± 4mV (Normal)
Standard value) 17 ± 5mV (CrO2)
Erase voltage for Deck 2 more than 80mV (Normal)
more than 90mV (CrO2)
12.1.4. Bias Frequency Adjustment (Deck
1/2)
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
set the unit to “REC” mode (
●
use “REC/STOP” key).
3. Adjust L1002 so that the output frequency is within the
standard value.
Standard Value: 97 ±8 kHz
12.2. Tuner Section
12.2.1. AM-IF Alignment
SIGNAL GENERATOR OR SWEEP
GENERATOR
RADIO DIAL SETTING INDICATOR
(ELECTRONIC
VOLTMETER
OSCILLOSCOPE)
ADJUSTMENT
(Shown in
Fig.3)
REMARKS
CONNECTIONS FREQUENCY
Fashion a loop of
several turns of wire
and radiate a signal
into the loop ant. of
receiver. 450 kHz 30% Mod.
at 400Hz. Point of non-interference
(on/about 600 kHz) Headphones Jack (32
Ω
)
Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.
Z102 (AM IFT) Adjust for maximum output.
21
SA-AK52