Technics QUARTZ ST-Z400L User Manual

3 ey £: Tele) &
m MEASUREMENTS AND ADJUSTMENTS
Note:
AM
OSC
coil
(L203),
AM
IFT
(T201)
and
LW
antenna
coil
(L251)
have
been
already
adjusted,
and
require
no
adjustment.
AM
ADJUSTMENT
|
Setting and Equipment used
. AC and OC electronic voltmeters (EVM) 5. Output of signal generator should be no higher than necessary to
. AM signal generator (AM-SG). obtain an output reading.
. Set Band selector to ‘‘MW/LW” position. 6. Use a non-metal screwdriver for the adjustment.
. Maintain line voltage at rated voltage.
AM SIGNAL GENERATOR DISPLAY i
——— aan FREQUENCY PREPARATIONS PARTS ADJUSTED | ADJUSTING PROCEDURE
CONNECTION FREQUENCY i
S nat aes t a, I= wecuntt 4 5, 23 a :
Nae MW-RF ADJUSTMENT _ * Set band selector to “MW” position.
612 kHz Connect AC EVM or i : 1. Adjust for maximum output.
1 (30% Mod. 612 kHz scope to “OUTPUT” | L202 (ANT. Coil) | 2. Adjust core of L202 by
Connect AM-SG to - with 400 Hz) screwdriver.
AM antenna terminal a - - a --
through
200
pF
1.
Adjust
for
maximum
output.
capacitor. Common to 1503 kHz ! Connect AC EVM or cT201 2. Repeat steps (1) and (2)
2]|
chassis.
(Weak
input)
©
(30%
Mod.
©
1503
kHz
scope
to
‘‘OUTPUT”
CANT.
-Teininien
until
the
frequency
correctly
‘ with 400 Hz) terminals. : : matches the frequency
display.
terminals.
LW-RF ADJUSTMENT * Set band selector to ‘'LW" position.
' 155 kHz Connect AC EVM or ! 1, Adjust for maximum output.
3 (30% Mod 155 kHz scope to “OUTPUT” L252 (OSC. Coil) | 2. Adjust core of L252 by
Connect AM-SG to with 400 Hz) | terminals. screwdriver.
AM
antenna
terminal
-
pe
mee
eS
ares
=
3
ase
:
ot
through
200
pF
|
|
1.
Adjust
for
maximum
output.
capacitor. Common to 353 kHz : Connect AC EVM or CT251 . 2. Repeat steps (3) and (4)
4]
chassis.
(Weak
input)
(30%
Mod.
353
kHz
i
scope
to
“OUTPUT”
until
the
frequency
correctly
(ANT. Trimmer)
with 400 Hz) | ; terminals
FM ADJUSTMENT
* Setting and Equipment used Preparation of FM signal generator (FM-SG)
FM signal generator (FM-SG). . Apply SG output to antenna terminal of the set through 75Q
Stereo modulator. FM dummy antenna.
Oscilloscope. . The standard input of the set is 60 dB (1 mV), 400 Hz, 100%
AC
and
DC
electronic
voltmeters
(EVM).
modulation
[Because
of
using
dummy
antenna,
SG
output
must
Frequency counter (19 kHz and 108 MHz measurable). be 12 dB (4uV) plus (IHF). That is, when input 60 dB (1 mV),
Low-pass filter (fe : 15 kHz ~19 kHz). SG output is to be 72 dB (4mvV)].
Set Band selector to FM” position . . Connect stereo modulator to FM-SG.
Set FM mode switch to ““mono” position.
matches the frequency
display.
DNADTRON=
FM SIGNAL GENERATOR DISPLAY
FREQUENCY
PREPARATIONS
PARTS
ADJUSTED
ADJUSTING
PROCEDURE
: T
CONNECTION FREQUENCY
FM-IF ADJUSTMENT
heh
FM-SG
to
|
Connect
DC
EVM
to
Picuch
ISG
ENE
100.1
MHz
between
JGEE
(—)
Adjust
T101
core
so
that
5
2
(90%
Mod.
100.1
MHz
and
(+)
T101
(Discri.
IFT)
voltage
measured
in
signal
dummy
antenna.
: ' : :
with
400
Hz)
through
chock
coil.
mode
is
O
mV in
300
mV
range.
(Apply
60 dB
(1
mV)
(Refer
to Fig. 1)
to antenna terminal) a
FM MPX V.C.0. ADJUSTMENT
USING A FREQUENCY COUNTER USING ALTERNATE SYSTEM
. 100.1 MHz, 60 dB Non-modulated mono signa! applied to set. (Fig. 2) 1. Apply stereo signal from generator or stereo station to tuner.
6
.
FM
mode
switch
to
‘‘auto”’
position.
2.
Adjust
VR301
until
stereo
indicator
lights
up.
Cement
arm
. Connect frequency counter to through resistor (100k). of VR301 as shown in Fig. 3.
. Adjust VR301 to 19 kHz + 30 Hz.
SEPARATION ADJUSTMENT
. Set the FM mode switch to
Connect FM-SG to “auto”.
FM antenna terminal poe as oy oe . Adjust VR302 so that R
through 759 FM Goce Mesh A i Had a 0 output is minimized when
dummy antenna. Doe 100.1 MHz eset fou (Separation) stereo modulator is in L
(Pilot 10% Mod. ee i: tie ) akan as 19 kHz) (L ch. modulation) mode
stereo signal} ae i Ay and that L pure is
minimized in R mode.
7

Technics QUARTZ ST-Z400L Specifications

General

Brand	Technics
Model	QUARTZ ST-Z400L
Category	Tuner
Language	English