(No.MB191)1-31
SECTION 4
ADJUSTMENT
4.1
Adjustment method
4.1.1 Measurement Instruments Required for Adjustment
(1) Low frequency oscillator
This oscillator should have a capacity to output 0dBs to
600
Ω
at an oscillation frequency of 50Hz-20kHz.
(2) Attenuator impedance : 600
Ω
(3) Electronic voltmeter
(4) Distortion meter
(5) Frequency counter
(6) Wow & flutter meter
(7) Test tape
VTT703 : Head azimuth
(8) Blank tape
TYPE l : AC-514
(9) Test disc: VT-501, CTS-1000
4.1.2 Measurement conditons
4.1.3 Radio Input signal
4.1.4 Tuner section
4.1.5 Standard measurement position of volume
Precautions for measurement
(1) Apply 30pF and 33k
Ω
to the IF sweeper output side and
0.082
µ
F and 100k
Ω
in series to the sweeper input side.
(2) The IF sweeper output level should be made as low as
possible within the adjustable range.
(3) Since the IF sweeper is a fixed device, there is no need
to adjust this sweeper.
(4) Since a ceramic oscillator is used, there is no need to
perform any MIX adjustment.
(5) Since a fixed coil is used, there is no need to adjust the
FM tracking.
(6) The input and output earth systems are separated. In
case of simultaneously measuring the voltage in both of
the input and output systems with an electronic voltmeter
for two channels, therefore, the earth should be connect-
ed particularly carefully.
(7) In the case of BTL connection amp., the minus terminal
of speaker is not for earthing. Therefore, be sure not to
connect any other earth terminal to this terminal. This
system is of an BTL system.
(8) For connecting a dummy resistor when measuring the
output, use the wire with a greater code size.
(9) Whenever any mixed tape is used, use the band pass fil-
ter (DV-12).
Power supply voltage
AC110V / AC127V / AC220V /
AC230V to AC240V
50Hz / 60Hz (Adjustable with the
voltage selector)
Reference output
Speaker : 0.775V/4
Ω
Headphone : 0.077V/32
Ω
Reference frequency and
input level
1kHz, AUX : -8dBs
Measurement output terminal at Speaker J200
Load resistance
4
Ω
AM frequency
400Hz
AM modulation
30%
FM frequency
400Hz
FM frequency deviation
22.5kHz
FM Band cover
87.5~108.0MHz
AM Band cover
531~1,602kHz (at 9kHz)
530~1,600kHz (at 10kHz)
Voltage applied to tuner
+B : DC5.7V
VT : DC 12V
Reference measurement output 26.1mV(0.28V)/3
Ω
Input positions
AM : Standard loop antenna
FM : TP1 (hot) and TP2 (GND)
Function switch to Tape
Beat cut switch to Cut
Super Bass/Active hyper Bass to OFF
Bass Treble to Center
Adjustment of main volume to reference output VOL : 28