1-30 (No.MB207)
SECTION 4
ADJUSTMENT
4.1
Measurement instruments required for adjustment
(1) Low frequency oscillator,
This oscillator should have a capacity to output 0dBs to
600ohm at an oscillation frequency of 50Hz-20kHz.
(2) Attenuator impedance : 600ohm
(3) Electronic voltmeter
(4) Frequency counter
(5) Wow flutter meter
(6) Test tape
VT712 : For Tape speed and wow flutter ( 3kHz)
VT710 : Head azimuth
VT724 : For Reference level (1kHz)
(7) Blank tape
TAPE : AC-225
(8) Torque gauge : For play and back tension
Forward ; TW2111A, Reverse ; TW2121A
Fast Forward and Rewind ; TW2231A
(9) Test disc
: CTS-1000(12cm),GRG-1211(8cm)
(10) Jitter meter
4.2
Measurement conditions
Power supply voltage
AC110V/127V/220V/230V to 240V, adjustable
Measurement output terminal
: Speaker out
: TP101(Mesuring for TUNER/DECK/CD)
: Dummy load 6ohm
Radio input signal
AM modulation frequency : 400Hz
Modulation factor : 30%
FM modulation frequency : 400Hz
Frequency displacement : 22.5kHz
Standard measurement positions of volume and switch
Power : Standby (Light STANDBY Indicator)
Sub woofer VOL. : Minimum
Sound mode : OFF
Main VOL. : 0 Minimum
Traverse mecha set position : Disc 1
Mic MIX VOL : MAX
ECHO : OFF
Precautions for measurement
(1) Apply 30pF and 33kohm to the IF sweeper output side
and 0.082 F and 100kohm 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 MPX 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 volt-
meter for two channels, therefore, the earth should be
connected particularly.
(7) In the case of BTL connection amplifier, the minus termi-
nal of speaker is not for earthing. Therefore, be sure not
to connect any other earth terminal to this terminal. This
system is of an OTL system.
