Adjustment Procedure - Marantz ST6000 Service Manual

6. ADJUSTMENT PROCEDURE

ALIGNMENT INSTRUCTIONS
EQUIPMENT NEEDED
AM Signal Generator Dummy antenna(FM Adjustment)
FM Signal Generator Stereo signal modulator
Oscilloscope Distortion analyzer
VTVM(AC,DC)
Test loop antenna(MW Adjustnent)
IMPORTANT
1.Check power-source voltage.
2.Set the function switch to band aligned.
3.Keep the function input as low as possible to adjust accurately.
4.Modulation and modulation frequency.
Modulation Modulation Frequency
MW(AM)/LW 30% 400Hz
FM 40kHz(EUR) 400Hz
75kHz(USA,JPN)
FM, MW/LW TRACKING VOLTAGE ADJUSTMENT
(FM) DC VOLTMETER
CONNECT TO TEST POINT TP11 and GND
(MW/LW) DC VOLTMETER
CONNECT TO TEST POINT TP11 and GND
NO Band Frequency Adjust for Adjustment
1 FM 87.50(76.00)MHz 1.6V L7
2 MW 522/520kHz 1V L204
3 LW 146kHz 1.3V L205
DC EVM
UNIT
FM
TP11
AM
GND GND
MW RF 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 Freq. Adjust for Adjustment
1 612/610kHz Max sensitivity L202(L203),T201,T202
MW
2 1503/1510kHz Max sensitivity CT21
(AM)
3 Repeat steps 1 and 2 several times.
1 164kHz Max sensitivity L203
LW 2 272kHz Max sensitivity CT22
3 Repeat steps 1 and 2 several times.
AC EVM OSCILLOSCOPE
MW-SG
kHz
MW loop antenna
OUTPUT
terminal
60cm
FM-RF ADJUSTMENT
Signal generator:Connects to FM ANT.JACK(FM IN)
through the dummy.
NO Frequency Adjust for Adjustment
1 90.10(79.10)MHz Max sensitivity L2,L5,L6
2 Repeat step 1 several times
AC EVM OSCILLOSCOPE
FM-SG
MHz
OUT
UNIT
OUTPUT
terminal
FM ANT
FM MONO DISTORTION ADJUSTMENT
DC VOLTMETER
Connect to TP12(-),TP13(+) through the chock
coil(100uH).
Signal Generator
Connect to FM ANT Jack(FM IN) through the dummy.
Distortion Meter
Connect to the output.
NO Frequency Adjust for Adjustment
1 100.10(83.10)MHz DC Voltmeter 0V
2 100.10(83.10)MHz min T.H.D
3 Repeat steps 1 and 2 several times
DC EVM
FM-SG
MHz
OUT
UNIT
Choke coil
TP12
Chassis
100 H
TP13
output
DISTORTION
ANALYSER
FM STEREO(WIDE/NARROW) SEPARATION
Pilot Signal Adjust for Adjustment
ON Different of R and L VR31 (WIDE)
must be maximum VR32 (NARROW)
OSCILLOSCOPE
FM-SG Dummy UNIT
FM IN OUTPUT
OUT
EXT
VR31 VR32
OUT
STEREO
MODULATOR
21
FM/MW(LW) AUTO STOP 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
Band Step Signal Generator
FM 1 100.10(83.10)MHz 35dB TUNED ON
2 100.10(83.10)MHz 35dB TUNED OFF
MW/LW 1 999(1000)kHz 80dB
(AM) 2 999(1000)kHz 80dB
ADJUSTMENT POINT
T101
T102
STEREO
VTVM
FM/MW(AM) SIGNAL METER LEVEL ADJUSTMENT
FM SIGNAL GENERATOR : Connect to FM ANT Jack(FM
MW SIGNAL GENERATOR : Connect to MW ANT. Coil
Band Signal Generator
Adjust for Adjustment
FM 100.10(83.10)MHz
VR11
66dB
VR11
MW 999(1000)kHz
TUNED ON VR21
(AM) 100dB
TUNED OFF VR21
22
IN) through the dummy
thriugh Loop antenna
Adjust for Adjustment
Sigmal Level:59~61dB VR12
FM(ANT A) IN
Signal Level:75~80dB VR22