FS-J50
SECTION 3
Adjustment
3.1 Adjustment method
Measurement Instruments Required for Tuner section
Adjustment
FM tuning range: 87.5MHz~108.00MHz
1. Low frequency oscillator AM tuning range: 530kHz~1,710kHz
This oscillator should have a capacity to output
0dBs to 600 at an oscillation frequency of Voltage applied to tuner +B : DC5.7V
50Hz-20kHz. VT : DC 12V
2. Attenuator impedance : 600 Reference measurement
3. Electronic voltmeter output 26.1mV(0.28V)/3
4. Distortion meter Input positions AM : Standard loop antenna
5. Frequency counter FM : TP1 (hot) and TP2 (GND)
6. Wow & flutter meter
7. Test tape
VT703L : Head azimuth
VT712 : Tape speed and running unevenness Standard measurement position of volume
(3kHz)
VT724 : Reference level (1kHz) Function switch to Tape
8. Blank tape Beat cut switch to Cut
TYPE : AC-225 Super Bass/Active hyper Bass to OFF
TYPE : AC-514 Bass Treble to Center
9. Torque gauge : For play and back tension Adjustment of main volume to reference output
FWD(TW2111A), REV(TW2121a) and VOL : 28
FF/REW(TW2231A)Precautions for measurement
10. Test disc: CTS-10001. Apply 30pF and 33k to the IF sweeper output
side and 0.082 F and 100k in series to the
sweeper input side. Measurement conditions
2. The IF sweeper output level should be made as
low as possible within the adjustable range. Power supply voltage
3. Since the IF sweeper is a fixed device, there is no AC 120V ~ , 60Hz
need to adjust this sweeper. Reference output : Speaker : 0.775V/4
4. Since a ceramic oscillator is used, there is no need : Headphone : 0.077V/32
to perform any MIX adjustment. Reference frequency and
5. Since a fixed coil is used, there is no need to adjust input level ------------------------------ 1kHz, AUX : -8dBs
the FM tracking. Measurement output terminal ------- at Speaker J3002
6. The input and output earth systems are separated. Load resistance --------------------------- 4
In case of simultaneously measuring the voltage in
both of the input and output systems with an
electronic voltmeter for two channels, therefore, the
Radio Input signal earth should be connected particularly carefully.
7. In the case of BTL connection amp., the minus
AM frequency |
ACEC
JVC
