1. Alignment and Adjustments
1-1 Instrument
TC1 |
TC2 |
TC4 |
T3(AMIF) |
L1(RF) V,C |
L2(OSC) |
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TC3 |
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T1 |
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T91 |
T4 |
TC6 |
L90/L91 |
T90 |
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L90(SW) |
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TC5 |
Fig 1-1 Location of Adjustment Point
1-1-1 Test Equipment
1. AM/FM Standard Signal Generator (S.S.G)
- AM : 400Hz, 30% MOD - FM : 1KHz , 40KHz(Deviation)
2.Oscilloscope
3.VTVM
4.Frequency counter
5.Loop antenna
6.Dummy load (3½)
7.DC voltmeter
8.SW Dummy ANT
9.FM Stereo Modulator
10.FM/AM IF Generator : 10.7MHz,455kHz
1-1-2 Pre-Adjustment
1.Check the source voltage
2.Select desired Band and Function.
3.Set the SBS control to off position.
4.Set volume control to approximaterly 50mW(3ohm)
1-2 Tuner Section
1-2-1 FM Adjustment
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Step |
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Item |
Connection |
SSG.FREQ. |
DIAL. Setting |
Adjust. Point |
Remark |
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LOW COVER |
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87.3 MHz |
Tune to |
FM OSC COIL |
Best resonating |
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1 |
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Fig 1-2 |
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the lowest |
: L2 |
point of SSG |
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HIGH COVER |
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Best resonating |
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2 |
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Fig 1-3 |
108.3 MHz |
Tune to |
OSC TRIMMER |
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point of SSG |
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the highest |
: TC2 |
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Fig 1-3 |
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FM RE COIL |
Maximum output |
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4 |
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LOW tracking |
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90 MHz |
90 MHz |
: L1 |
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106 MHz |
106 MHz |
ANT TRIMMER |
Maximum output |
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5 |
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HIGH tracking |
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Fig 1-3 |
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: TC1 |
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Samsung Electronics |
1-1 |
1-2-2 AM Adjustment(2BAND)
Step |
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Item |
Connection |
SSG.FREQ. |
DIAL. Setting |
Adjust. Point |
Remark |
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Intermediate |
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Tune to |
AM IFT |
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455 KHz |
: T3(WHT) |
Maximum output |
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1 |
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frequency (IF) |
Fig1-4 |
the lowest |
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adjustment |
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LOW COVER |
Fig 1-5 |
515 KHz |
Tune to |
AM OSC COIL |
Best responding |
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: T91(RED) |
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2 |
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point of SSG |
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the lowest |
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HIGH COVER |
Fig 1-5 |
1650 KHz |
Tune to |
OSC TRIMMER |
Best responding |
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3 |
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: TC3(VARICON) |
point of SSG |
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the highest |
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AM ANT COIL |
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LOW tracking |
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Fig 1-5 |
600 KHz |
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Maximum output |
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4 |
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600 KHz |
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: L90 |
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1400 KHz |
1400 KHz |
ANT TRIMMER |
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HIGH tracking |
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Fig 1-5 |
Maximum output |
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5 |
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: TC4(VARICON) |
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AM IF OUTPUT : PIN NO. 8 of IC2(LA1260)
TUNER PART
IF GENERATOR
IC1 BODY
O
PIN 8
GND
OF IC2
O O GROUND
O
Input o output o
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Fig 1-2 |
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Oscilloscope |
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EXT |
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FM antenna : TP1 |
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FM |
GND |
75Ω |
SET |
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SSG |
Dummy |
GND |
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VTVM |
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Speaker |
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OUT |
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OUT |
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Stereo |
3.2 ohm load |
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Modulator |
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(Pilot 10%) |
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Fig 1-3
1-3 3BAND Adjustment
1-3-1 AM/SW
Step |
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Item |
Connection |
SSG.FREQ. |
DIAL |
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Adjust. |
Remark |
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Setting |
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Point |
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Intermediate |
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455 KHz |
Tune to |
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AM IFT |
Maximum output |
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1 |
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frequency (IF) |
Fig1-4 |
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: T3(WHT) |
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the lowest |
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adjustment |
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AM-LOW |
Fig 1-5 |
515 KHz |
Tune to |
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AMOSC COIL |
Best responding |
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2 |
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COVER |
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the lowest |
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: T91(RED) |
point of SSG |
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AM-HIGH |
Fig 1-5 |
1650 KHz |
Tune to |
OSC TRIMMER |
Best responding |
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3 |
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COVER |
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the highest |
:TC4(VARICON) |
point of SSG |
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AM ANT COIL |
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AM-LOW |
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600 KHz |
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4 |
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Fig 1-5 |
600 KHz |
Maximum output |
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tracking |
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: L91 |
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ANT TRIMMER |
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AM-HIGH |
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1400 KHz |
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5 |
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Fig 1-5 |
1400 KHz |
Maximum output |
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tracking |
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: TC6 |
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SW-LOW |
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Tune to |
SW OSC COIL |
Best responding |
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6 |
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Fig 1-6,1-7 |
5.7 MHz |
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COVER |
the lowest |
: T90(GRN) |
point of SSG |
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SW-HIGH |
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Tune to |
OSC C-TRIMMER |
Best responding |
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7 |
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Fig 1-6,1-7 |
18.5 MHz |
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COVER |
the highest |
: TC3 |
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point of SSG |
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SW-ANT COIL |
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SW-LOW |
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8 |
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Fig 1-6,1-7 |
7 MHz |
7 MHz |
Maximum output |
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tracking |
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: L90 |
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ANT TRIMMER |
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SW-HIGH |
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Fig 1-6,1-7 |
16 MHz |
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Maximum output |
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: TC5 |
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tracking |
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TUNER PART |
IF GENERATOR |
AM LOOP ANT |
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PIN 9 |
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OF IC2 |
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O |
GND |
AM ANT |
O |
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Input o |
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output o |
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Fig 1-4
1-2 |
Samsung Electronics |