Adjustment Procedure - Marantz ST4000 Service Manual

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.
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.
MODULATION
MODULATION
FREQUENCY
MW
30% 400Hz
FM
100%(75KHz) 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
ADJUST ADJUST-
NO BAND FREQUENCY
FOR MENT
1 FM 87.50MHz 1.5V L4
2 MW 522KHz 1V L103
DC EVM
UNIT
FM
TP11
AM
GND
GND
(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.
NO STEP FREQUENCY ADJUST FOR
1 612KHz Max sensitivity
MW 2 1503KHz Max sensitivity
3 Repeat steps 1 and 2 several times.
AC EVM OSCILLOSCOPE
AM-SG
MHz
AM LOOP antenna
OUTPUT
terminal
60cm
(4) FM-RF ADJUSTMENT
Signal Generator : Connects to FM ANT. JACK (FM IN)
through the dummy.
NO FREQUENCY ADJUST FOR ADJUSTMENT
1 90.10MHz Max sensitivity L1,L2,L3
2 Repeat step 1 several times
AC EVM OSCILLOSCOPE
FM-SG
MHz
OUT
UNIT
OUTPUT
terminal
FM ANT
13
(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.
ADJUS-
NO FREQUENCY ADJUST FOR
MENT
DC Voltmeter
L102
1 100.10MHz
CT01
2 100.10MHz min T.H.D
3 Repeat steps 1 and 2 several times
FM-SG
MHz
OUT
TP12
Chassis
TP13
(6) FM STEREO SEPARATION
PILOT
ADJUST FOR
SIGNAL
Different of R and L
ON
Must be maximum
FM-SG Dummy
FM IN
OUT
EXT
OUT
STEREO
MODULATOR
(7) FM/MW TUNED LEVEL ADJUSTMENT
FM Signal Generator : Connect to FM ANT. Jack (FM IN)
MW Signal Generator : Connect to MW ANT. Coil thriugh
BAND STEP SIGNAL GENERATOR ADJUST FOR ADJUSTMENT
ADJUSTMENT
FM 1 100.10MHz 30dB
T101 2 100.10MHz 30dB
0V
MW 1 999KHz 80dB
T102
2 999KHz 80dB
DC EVM
UNIT
Choke coil
100 H
output
DISTORTION
ANALYSER
ADJUSTMENT
VR03
STEREO
OSCILLOSCOPE
UNIT
OUTPUT
VTVM
VR03
14
through the dummy.
Loop antenna.
TUNED ON VR02
TUNED OFF VR02
TUNED ON VR01
TUNED OFF VR01