MARANTZ ST4000
Manual de Servicio

6. ADJUSTMENT PROCEDURE
(1) ALIGNMENT INSTRUCTIONS
EQUIPMENT NEEDEDIMPORTANT AM Signal Generator1.Check power-source voltage. FM Signal Generator2.Set the function switch to band aligned. Oscilloscope3.Keep the function input as low as possible to adjust. VTVM(AC,DC) accurately. Test loop antenna (MW Adjustnent) 4.Modulation and modulation frequency. Dummy antenna(FM Adjustment) Stereo signal modulator. Distortion analyzerModulationModulation Frequency.
MW 2 3 1503KHz Max sensitivity CT01 2 3 100.10MHz Repeat steps 1 and 2 several times. NO STEP 1
FREQUENCY

(3) MW TRACKING ADJUSTMENT
Signal Generator : Connects to the MW Ant. Coil through the loop antenna. Adjust for the indication of VTVM of the wave form of scope to be maximum.

(5) FM MONO DISTORTION ADJUSTMENT
DC VOLTMETER Connect to TP02 (-),TP03 (+) through the chockcoil (100 H). Signal Generator Connect to FM ANT. Jack (FM IN) through thedummy. Distortion Meter Connect to the output.
ADJUSMENT L102

(7) FM/MW TUNED LEVEL ADJUSTMENT
FM Signal Generator : Connect to FM ANT. Jack (FM IN) through the dummy. MW Signal Generator : Connect to MW ANT. Coil thriugh Loop antenna.

ADJUST FOR Max sensitivity

NO 1

FREQUENCY 100.10MHz

ADJUST FOR DC Voltmeter 0V min T.H.D

ADJUSTMENT T101

BAND STEP SIGNAL GENERATOR ADJUST FOR FM 1 2 MW 1 2 100.10MHz 30dB 100.10MHz 30dB 999KHz 80dB 999KHz 80dB TUNED TUNED TUNED TUNED ON OFF ON OFF

ADJUSTMENT VR02 VR02 VR01 VR01

612KHz

T102

Repeat steps 1 and 2 several times

EQUIPMENT NEEDEDIMPORTANT
AM Signal Generator1.Check power-source voltage. FM Signal Generator2.Set the function switch to band aligned. Oscilloscope3.Keep the function input as low as possible to adjust. VTVM(AC,DC) accurately. Test loop antenna (MW Adjustnent) 4.Modulation and modulation frequency.
AM-SG
MHz

AC EVM

OSCILLOSCOPE

FM-SG
MHz OUT

DC EVM

75ohm

UNIT
AM LOOP antenna
60cm OUTPUT terminal

TP12 Chassis TP13

Choke coil 100 H output

MODULATION

MODULATION FREQUENCY

DISTORTION ANALYSER

MW FM

30% 100%(75KHz)

400Hz 400Hz

(2) TUNING FREQUENCY RANGE ADJUSTMENT
(FM) DC VOLTMETER CONNECT TO TEST POINT TP1 and GND (MW) DC VOLTMETER CONNECT TO TEST POINT TP1 and GND
NO 1 2 BAND FREQUENCY FM MW 87.50MHz 522KHz ADJUST FOR 1.5V 1V ADJUSTMENT L4 L103

(4) FM-RF ADJUSTMENT
Signal Generator : Connects to FM ANT. JACK (FM IN) through the dummy.

(6) FM STEREO SEPARATION
PILOT SIGNAL ON ADJUST FOR Different of R and L Must be maximum ADJUSTMENT VR03

NO 1 2

FREQUENCY 90.10MHz

ADJUST FOR Max sensitivity

ADJUSTMENT L1,L2,L3
STEREO OSCILLOSCOPE FM-SG Dummy UNIT
FM IN OUTPUT

Repeat step 1 several times

DC EVM

FM-SG
MHz OUT

AC EVM

OSCILLOSCOPE

EXT

OUT

VTVM VR03

OUT

UNIT FM AM GND TP11 GND UNIT
OUTPUT terminal FM ANT

STEREO MODULATOR

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