(No.MB368)1-51
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
VT703 : Head azimuth
VT712 : Tape speed and running unevenness(3kHz)
VT724 : Reference level (1kHz)
(8) Blank tape
TYPE l: AC-225
TYPE ll: AC-514
(9) Torque gauge : For play and back tension
FWD(TW2111A), REV(TW2121a) and
FF/REW(TW2231A)
(10) 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 / AC220VAC230V ~ AC240V
(Adjustable with the voltage selector)50Hz / 60Hz
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 - 1,710kHz (at 9kHz)
530 - 1,710kHz (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
Содержание DX-T5
Страница 25: ... No MB368 1 25 Fig 3 Fig 4 Fig 5 Open det lever b Tray assemblies Side R assembly c Tray assembly ...
Страница 38: ...1 38 No MB368 Fig 36 Fig 37 Main tray Sub tray Tray stopper Tray stopper ...
Страница 61: ... No MB368 1 61 SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING ...
Страница 113: ...3 51 MEMO ...
Страница 168: ... M E M O ...