SAMSUNG MAX75sef, MAX72, MAXN75SESA Schematics
1. Alignment and Adjustments
1-1 Tuner
* Adjustment Location of SW Band
* Adjustment Location of LW Band
FM THD Adjustment
SSG FREQ. |
98 MHz |
Adjustment
point FM DETECTOR COIL (TL3)
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60 dB |
Output |
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Minumum Distortion (0.3% below) (Figure 1-1)
Output |
FM |
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Antenna |
SET |
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GND |
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Terminal |
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FM S.S.G |
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Input |
Oscilloscope |
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Speaker |
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Terminal |
output |
Input |
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Distortion Meter |
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Figure1-1 IF CENTER and THD Adjustment
FM Search Level Adjustment
SSG FREQ. |
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98 MHz |
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Adjustment |
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BEACON |
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point |
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SENSITIVITY |
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(TSR1) |
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SEMI-VR(5KΩ) |
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Output |
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23 dB |
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Adjust TSR1 so that “TUNED” of FLT is lighted (Figure 1-2)
*Adjust FM S.S.G level to 23dB
AM(MW) I.F Adjustment
SSG FREQ. |
450 kHz |
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Frequency |
522 kHz |
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Adjustment |
AM I.F COIL |
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(TL2) |
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Maximum output (Figure 1-3)
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23 dB |
FM Antenna |
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SET |
FM S.S.G |
GND |
FM IN |
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5 kΩ
Figure1-2 FM Auto Search Level Adjustment
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60cm |
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TL2 |
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OUTPUT |
AM ANT |
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IN |
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AM SSG |
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Speaker Terminal |
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450KHZ |
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INPUT |
OUTPUT |
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VTVM |
Oscilloscope |
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Figure1-3 AM I.F Adjustment
Samsung Electronics |
1-1 |
Alignment and Adjustments
1-1-2 AM(MW),LW,SW1,SW2 Adjustment
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Circuit |
Measuring Instrument & |
Step |
S.S.G |
Radio dial |
Adjusting |
Adjust for |
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to be |
Arrangement |
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Frequency |
Setting |
Point |
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Adjusted |
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1 |
522KHz |
522KHz |
MW OSC |
Aduust for 1.0V±0.1V at the low. |
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OSC |
Connect AM signal |
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(IR117) |
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generator to loop |
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antenna,VTVM AND |
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oscilloscope |
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1611KHz |
1611KHz |
MW OSC |
Check for 7.0V±1.0V at the high. |
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(Fig 1-3) |
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(IR117) |
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AM |
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(MW) |
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RF |
“ |
1 |
594KHz |
594KHz |
MW ANT |
Maximum out |
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INTER FREQ |
“ |
1 |
455KHz |
522KHz |
TL2 |
Maximum out |
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OSC |
Fig 1-3 |
1 |
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146KHz |
LW OSC |
Aduust for 2.0V±0.1V at the low. |
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LW |
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2 |
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290KHz |
LW OSC |
Check for 7.0V±1.0V at the high. |
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RF |
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1 |
150KHz |
150KHz |
LW ANT |
Maximum out |
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OSC |
Fig 1-3 |
1 |
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2.3MHz |
SW1 OSC |
Aduust for 1.0V±0.1V at the low. |
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SW1 |
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2 |
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7.3MHz |
- |
Check for 8.5V±1.0V at the high. |
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RF |
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1 |
3.5MHz |
3.5MHz |
SW1 ANT |
Maximum out |
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OSC |
Fig 1-3 |
1 |
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9.5MHz |
SW2 OSC |
Aduust for 1.5V±0.1V at the low. |
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SW2 |
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2 |
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26.1MHz |
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Check for 8.0V±1.0V at the high. |
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RF |
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1 |
10MHz |
10MHz |
SW2 ANT |
Maximum out |
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1-2 |
Samsung Electronics |
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