Tape Speed Adjustment (Deck 1/2); Bias And Erase Voltage Check; Bias Frequency Adjustment; Tuner Section - Panasonic SA-AK52 Service Manual

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.

12.2. Tuner Section

12.2.1. AM-IF Alignment
SIGNAL GENERATOR OR SWEEP
GENERATOR
CONNECTIONS FREQUENCY
Fashion a loop of 450 kHz 30% Mod.
several turns of wire at 400Hz.
and radiate a signal
into the loop ant. of
receiver.

12.1.3. Bias and Erase Voltage Check

Bias voltage for Deck 2
Standard value)
Erase voltage for Deck 2
12.1.4. Bias Frequency Adjustment (Deck
RADIO DIAL SETTING
(ELECTRONIC
VOLTMETER
OSCILLOSCOPE)
Point of non-interference Headphones Jack (32Ω)
(on/about 600 kHz) Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.
21
1. Set the unit "AUX" position.
2. Insert the Normal blank tape (QZZCRA) into DECK 2 and
the unit to "REC" mode (use "
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.
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 (
3. Adjust L1002 so that the output frequency is within the
standard value.
Standard Value: 97 ±8 kHz
INDICATOR ADJUSTMENT
(Shown in
Fig.3)
Z102 (AM IFT)
REC/STOP" key).
14 ± 4mV (Normal)
17 ± 5mV (CrO2)
more than 80mV (Normal)
more than 90mV (CrO2)
use "REC/STOP" key).
REMARKS
Adjust for maximum output.
SA-AK52