Technics Quartz ST-G7 User Manual

BR
' adjusted, and require no
|, 400 Hz, 100%
axial cables. SG
t60dB SG
omatically turned on.
ff/scan level selector switch.
ormal’’.
\DJUSTING PROCEDURE
Adjust T101 core so that
voltage measured in signal
mode is O mV in 300 mV
range.
Adjust for maximum output.
Adjust core of T103 by
screwdriver.
Adjust VR102 so that
voltage measured in
signal mode is O mV in
300 mV range.
Adjust L6 for 3.0V
reading on DC EVM.
Add weak input so that
noise is included in the
output wave form,
Make the adjustment so that
the output wave form is ver-
tically symmetrical. (Fig. 7).
Repeat the steps (8), (9) and
(10) until the frequency cor-
rectly matches the frequency
display.
ike the adjustments so that
> output waveform is
nimum referring to
y. 9,
just T1 and T103 core so that
tortion of right and left
annels are minimized,
Step
No.
13
14
Control
Output
|
AM
ANT
/FM
ANT
input
terminal
Loop
EXT
(75)
terminal -—
—
=
FM
ANT
@ S coil
a
mzsr| | AM RF coil
L302
NO
ADJUSTMENT
Oa
lak
L203]
522kHz
Z)
L303
NO
FM
ANT
coil
ADJUSTMENT
Computer
control
AC inlet terminal
T105 NO ADJUSTMENT
ADJUSTMENT Mae
Ground point
450 kHz
| T201
19 kHz Pulse count FM IFT Signal strength AM IFT FM 1 st FM 1 st
cancel adj, duty adj. (3rd) level adj. (1 st) OSC. OSC coil
trimmer
AM Signal generator (AM-SG)
Oscilloscope
AM antenna terminal
¢ Output
oe terminal
Capacitor
{200pF)
[Fig. 1] [Abb. 1]
DC EVM i
FM
SIGNAL
GENERATOR
DISPLAY
Cc
Oscilloscope
FREQUENCY PREPARATIONS PARTS ADJUSTED ADJUSTING PROCEDURE —
CONNECTION
FREQUENCY
FM
Signal
generator
(FM-SG)
“6
ae
SEPARATION ADJUSTMENT
TEK I =
1. Adjust VR303 so that R
Connect FM-SG to te Te at ae |
FM
antenna
terminal
Connect
AC
EVM
to
output
is
minimized
when
i730)
: : 100.10 MHz i i : stereo modulator is in L
referring to Fig. 11. (90% Mod. erat Pit oe ena u G04 (L ch. modulation) mode.
(Apply Poe RMEPNE | nthe KHz) Pa ee (Separation) 2. Adjust VR304 so that L 4-68 sees
tees
oe
Mod.
(L
or
R
mode)
(fe
=
15
kHz
~19
kHz}
ee
FEM
antenna
_(SLOx10!-20)
FM
antenna
terminal
(750)
stereo signal.) R (R ch modulation) mode terminal (750) Fig. 3 Abb. 3
as ls : [Fig. 2] [Abb. 2] [Fig. 3] [ ]
SIGNAL STRENGTH LEVEL ADJUSTMENT
1. Change LCD display from DC EVM
frequency to dB by pressing pra
Connect FM-SG to the FM signal button. .
EM antenna terminal. aaa ree i cee 2. Adjust VR101 so that 50dB| FM Signal generator (FM-SG) FM Signal generator (FM-SG)
(Apply 0 dB to oa aed Hz) 3 ‘eet g is indicated. ©
antenna terminal.) 3. Make sure that the signal
strength level is 22 ~ 38 dB TP302 & ee ee | ees
when the input is 30 dB.
Z
Ground
Ground
‘eae eee
FM
antenna
terminal
(75)
on
antenna
terminal
Q)
Adjustment points [Fig. 4] [Abb. 4]
612 kHz 1503 kHz {Fig.5] [Abb. 5]
19 kHz R-L L-—R FM AM ANT AM ANT
Filter
separation
separation
discri.
IFT
coil
trimmer
FM
Signal
generator
(FM-SG)
.
Noise
Tior | L202] [er201 Oscilloscope kar ee
Output
goo dO: terminal
FM antnna terminal (752)
[Fig. 6] [Abb. 6]
Noise
AF output wave form
[Fig. 7] [Abb. 7]
Oscilloscope
FM Signal generator (FM-SG)
pee agett
[Fig. 9] [Abb. 9]
FM antenna
terminal (750)
[Fig. 8] [Abb. 8]
FM Signal generator (FM-SG) Distortion analyser
Output
B O° OD terminal
FM antenna
terminal (752)
[Fig. 10] [Abb. 10]
Low pass filter
FM Signal generator (FM-SG) ACEVM ACEVM
FM antenna terminal (7522)
[Fig. 11] [Abb. 11]

Technics Quartz ST-G7 Specifications

General

Brand	Technics
Model	Quartz ST-G7
Category	Tuner
Language	English