Adjustment Procedure; Tuner Adjustment Point; Alignment Instructions; Fm, Am Tracking Voltage Adjustments - Marantz SR5000/N1B Service Manual

6. ADJUSTMENT PROCEDURE

ALIGNMENT INSTRUCTIONS

(1) EQUIPMENT NEEDED
AM Standard Signal Generator
FM Standard Signal Generator
Oscilloscope
VTVM (AC,DC)
AM Test Loop Antenna (AM Adjustment)
FM Dummy Antenna (FM Adjustment)
Stereo Signal Generator (RDS IN : EUROPE ONLY)
Frequency Counter
Distortion Analyser
Item
Modulation
Band
AM
FM (EUR, OVC) MONO : 40 kHz DEV.
SR5000/N1B STERO : L=R (40 kHz), PILOT (7.5 kHz) 47.5 kHz DEV.
SR5000/K1B
RDS : STEREO + RDS (1.2 kHz) 48.7 kHz DEV.
FM (USA)
MONO : 75 kHz DEV. (100 %)
SR5000/U1B
DTEREO : L=R (67.5 kHz), PILOT (7.5 kHz)

TUNER ADJUSTMENT POINT

IMPORTANT
1.Check power-source voltage.
2.Set the function switch to band aligned.
3.Keep the signal input as low as possible to adjust accurately.
4.Modulation and modulation frequency.
Modulation freq.
30 % 400 Hz
1 kHz
1 kHz
37

(2) FM, AM TRACKING VOLTAGE ADJUSTMENTS

AM,FM DC Voltmeter : Connect to test point TP1 and GND
NO Band Frequency Adjust for Adjustment
1 FM 87.50 MHz 1.6V L7
AM 522 kHz 1.0V L13
2
AM 520 kHz 1.0V L13
DC EVM
UNIT
FM
TP1
AM
GND GND
(3) AM RF ADJUSTMENTS
Signal generator : Connect to the AM Ant.
Coil through the loop antenna.
Adjust for the indication of VTVM of the wave form of scope
to be maximum.
/N1B, /K1B
Band NO Frequency Adjust for Adjustment
1 612 kHz L12,T13
Max sensitivity
AM 2 1503 kHz Max sensitivity CT1
3 Repeat steps 1 and 2 several times.
/U1B
Band NO Frequency Adjust for Adjustment
1 610kHz L12,T13
Max sensitivity
AM 2 1510 kHz Max sensitivity CT1
3 Repeat steps 1 and 2 several times.
DC EVM
FM-SG
MHz
OUT
UNIT
Choke coil
TP12
100 H
TP13
output
FM Dummy
DISTORTION
FM 75ome in
ANALYSER
(4) FM RF ADJUSTMENTS
Signal generator : Connect to FM Ant. (FM 75 ohm) through
the dummy.
Adjust for indication of VTVM of the wave form of scope to
be maximum.
Band NO Frequency Adjust for Adjustment
1 100.10 MHz L2,L5,L6,T1
Max sensitivity
FM
3 Repeat steps 1 several times.
AC EVM OSCILLOSCOPE
AM-SG
kHz
AM LOOP antenna
OUTPUT
terminal
60cm
(5) FM MONO DISTORTION ADJUSTMENTS
Signal Generator : Connect to FM Ant. (FM 75 ohm) through
the dummy.
DC Voltmeter : Connect to TP2(+),TP3(-) through the choke
coil (100uH).
Distortion Meter : Connect to output L or R.
Band NO Frequency Adjust for Adjustment
1 100.10 MHz DC Voltmeter 0V T11
FM 2 100.10 MHz Minimum T.H.D T12
3 Repeat steps 1 and 2 several times.
AC EVM OSCILLOSCOPE
FM-SG
MHz
OUT
UNIT
FM Dummy
FM 75ome in OUTPUT
38