Bias And Erase Voltage Check; Tuner Section - Panasonic SA-AK22 Service Manual

SA-AK22
4. After alignment, assure that the output frequency of the
DECK 1 FWD are within ±60 Hz of the value of the output
frequency of DECK 2 FWD.

12.1.2. 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 "
3. Measure and make sure that the output is within the
standard value.
Bias voltage for Deck 2
Standard value)
Erase voltage for Deck 2

12.2. Tuner Section

12.2.1. AM-IF Alignment
• 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 signal
into loop of receiver.
• FM/AM-RF ALIGNMENT
SIGNAL GENERATOR OR SWEEP
GENERATOR
CONNECTIONS FREQUENCY
Fashion a loop of 520 kHz
several turns of
wire and radiate
signal into loop of
receiver.
Fashion a loop of 600 kHz
several turns of
wire and radiate
signal into loop of
receiver.
REC/STOP" key).
14 ± 4mV (Normal)
more than 80mV (Normal)
RADIO DIAL SETTING
(ELECTRONIC
VOLTMETER
OSCILLOSCOPE)
Point of non- Headphone Jack (32Ω)
interference (on/about Fabricate the plug as
600 kHz) shown in Fig. 2 and then
connect the lead wires of
the plug to the
measuring instrument.
RADIO DIAL SETTING INDICATOR
(ELECTRONIC
VOLTMETER
OSCILLOSCOPE)
Tuning capacitor fully Headphone Jack (32Ω)
closed. Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the measuring
instrument.
Tuning capacitor fully Headphone Jack (32Ω)
open. Fabricate the plug as
shown in Fig. 2 and then
connect the lead wires of
the plug to the measuring
instrument.
22
12.1.3. 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 (
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)
ADJUSTMENT(Shown in
Fig.1)
Z101 (AM OSC Coil)
Z101 (AM ANT Coil)
use "REC/STOP" key).
REMARKS
Adjust for maximum
output.
REMARKS
Adjust for maximum
output.
Adjust for maximum
output.