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SECTION 2. ELECTRICAL
ADJUSTMENTS
Figure 1. MAIN PCB Board
<BOTTOM VIEW> <TOP VIEW>
Figure 2. RF PCB Board
1. Test & Adjustment point
A
B
C
D
E
T101
VR301
L206 L256 T202 T201 L254
L204
L255
L205
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2. FM Adjustment
Figure 3.
(1) The impedance of FM antenna terminal is 75Ω
Therefore, connect coaxial cable (3C-2V etc.) between FM SG and antenna terminal when wiring.
(2) There are two kind in indication of FM SG output attenuator.
1) Attenuator with Marking of 75Ω open...open indication type.
2) Attenuator with marking of 75Ω load or close...load or close indication type.
(3) FM SG output level in this FM adjustment are described as open indication type. The left table shows
relations among FM SG attenuator indication(dB), available power ratio(dBf) and antenna terminal
voltage(dB/µV) in each indication type.
Notes:
1. BAND Switch
........................................................................................................................................
FM
2. BALANCE
.......................................................................................................................................
Center
3. TREBLE/BASS
................................................................................................................................
Center
4. Connect as shown in figure 3.
5. Refer to figure 1~2 for Adjustment Points.
Item FM SSG Attenuator Available Antenna
Type Indication Power Ratio Terminal Voltage
Open indication type
0dB 5.2dBf 6dB/µV
60dB 65.2dBf 66dB/µV
Load or close 0dB 11.2dBf 12dB/µV
indication type 54dB 65.2dBf 66dB/µV
FEED SIGNAL
STEP SUBJECT
FROM TO
MEASURE OUTPUT ADJUSTMENT ADJUST FOR
1 Discriminator 98MHz 60dB ANT Jack Between Point XX & Point T101 DC 0V±10mV
22.5kHz Dev. or XX, DC Volt Meter.
1kHz FM SSG Point XX
2 MPX 98MHz 60dB Same as Between Point XX & GND, VR301 76kHz±50Hz
Adjustment
75kHz Dev.1kHz
above
Frequency Counter
FM SSG
A
C
D
E
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3. AM(MW) Adjustment
Notes:
1. BAND Switch
...................................................................................................................................
AM(MW)
2. Connect as shown in figure 4.
3. Refer to figure 1~2 for Adjustment Points.
Figure 4.
FEED SIGNAL
STEP SUBJECT
FROM TO
MEASURE OUTPUT ADJUSTMENT ADJUST FOR
1 520 or 522kHz No Input LCD Display TUNE +/- Button 520 or 522kHz
(Reception Frequency)
Tuning Voltage Between Point XX and GND, L206 DC 1.2V ± 0.05V
Adjustment DC Volt Meter
2 IF Coil 600kHz or ANT Jack Output L or R ch, T201 & T202 Max. Output
Adjustment 603kHz ANT or PointXX VTVM & Oscilloscope
input, 30dB,
400Hz (30%
MOD) SSG.
3 600kHz or 600kHz or Same as LCD Display TUNE +/- Button 600 or 603kHz
603kHz 603kHz ANT above (Reception Frequency)
RF Adjustment input, 30dB,
400Hz (30%
Output L or R ch, L204 & L205 Max. Output
MOD) SG.
VTVM & Oscilloscope
A
B
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4. LW Adjustment(Optional)
Notes:
1. BAND Switch
...........................................................................................................................................
LW
2. Connect as shown in figure 5.
3. Refer to figure 1~2 for Adjustment Points.
Figure 5.
FEED SIGNAL
STEP SUBJECT
FROM TO
MEASURE OUTPUT ADJUSTMENT ADJUST FOR
1 144kHz No Input LCD Display TUNE +/- Button 144kHz
(Reception Frequency)
Tuning Voltage Between Point XX and GND, L256 DC 1.2V ± 0.05V
Adjustment DC Volt Meter
2 150kHz 150kHz ANT Jack LCD Display TUNE +/- Button 150kHz
RF Adjustment ANT input, or PointXX (Reception Frequency)
30dB, 400Hz
(30% MOD)
Output L or R ch, L254 & L255 Max. Output
SSG.
VTVM & Oscilloscope
A
B
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5. Cassette Deck Adjustment
(1) Before this adjustment, clean PLAYBACK head surface.
(2) For this adjustment, use test tape MTT-114.
(3) VOLUME
......................................
Center
(4) BALANCE
....................................
Center
(5) TREBLE/BASS
............................
Center
(6) Connect as shown in figure 6.
Figure 6.
Figure 7.
SUBJECT MEASURE OUTPUT SETTING ADJUSTMENT ADJUST FOR REMARKS
P.B Head L-CH, R-CH, VTVM and Playback(FWD & Adjust the azimuth Max. Output After this
Adjustment Scope See figure 6. REV) the TEST adjusting screw both channels adjustment, lock
TAPE MTT-114 (in figure 7). on FWD and the screw with
REV PLAY paint.
Forward Head Azimuth
Adjustment Screw
Head
Screw Driver
Reverse Head Azimuth
Adjustment Screw
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