Technics Quartz ST-G7 User Manual

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33K
—FM 2nd IF signal
8.6
A signal] REC input
SWITCH
A CONTROL
> NON DISTORTION
nn ee a
Ol,u2a
igeaso MAI65
VRIO3
5018 a Pilot cancel adj.
Ci3! 20.01
Ol
27 26 25 24 23 21 20 19 18 17 16! 15
Qs
564A 286945
INTEGRAL .
103
5
. LOCK IND.ORIVE
TA
5
/ LOCK IND. CONTROL
0401
SVDAY5533K- M
QUARTZ INDICATOR
0402
SVDPR5533K
STEREO INDICATOR
75 kHz L.P.F.
Qos
2SA995NGF
INTEGRAL
Q109-
2SC1583
INTEGRAL
0106
MAI65
11 12 13 14
Qs
2S8c945
DISTORTION
CONTROL
Qui?
2S¢945
RF SWITCHING
1€ 303,304
MN4066BS
PEAK SAMPLING
SWITCH/MUTING/
HIGH BLEND
FM STEREO ‘2.47 24i2al2aro2 2alza 20720”
1c301
AN7471S MPXx
28 27 26 25 24 23 22 21 20 19 18 17 16 15
Q50!
2SAS64A
MUTING CONTROL
1C 305,306 9502, 503
AN6554
OPE AMP ascoss
[_[rmyam] Trm]am] [FM] am] [FM] am] | Fm [am]
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PLL
cain R+90° L L-90° mute mute
? Fn” Poe vret “in” “Spt” GND , SF OUTPUT
O-~O—@ OOO) 1) --) (4)
Rech
Rch sampling pulse
°
Input signal for
tuner control
J >
o> S064
L—90° sampling
pulse
FM mono
distortion OmV re
Pilot cancel ; :
coil Peak sampling switch 5OKB
SIS bb —_—
Separation adj. .
D710,
712
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SONTROL
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2SA564A C) cs
REGULATOR
(VOLTAGE
SELECTOR)
(MAIN POWER)
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AC 1107120/220/240V
(50/60 Hz)
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16V, ZENER
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REGULATOR =8 5 5 ie
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——()
m@ SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any
time with the development of new technology.)
* The part No. of transistors. |C and diodes mentioned
in the schematic diagram stand for production part
No. with @ mark, the production part No. are dif-
ferent from the replacement part No. Therefore,
when placing an order for replacement part please use
the part No. in the replacement part list.
Note 1:
1. ST1~S8_: Preset tuning switch.
FM1ch~8ch, AMQch~16ch.
2. $9 : Tuning (up) switch. (manual auto)
[up: tuning to higher frequency]
3. $10 : Tuning (down) switch. (manual «> auto)
[down: tuning to lower frequency]
4. $11 : Memory switch. (manual «+ auto)
5. $12 : FM selector switch.
6. $13 : AM selector switch,
7. $14 : Recording level check switch.
8. $15 : FM signal strength level call switch.
9. $16 : FM IF band selector switch.
(normal «super narrow)
10. $17 : FM mode switch. (auto «» mono)
11, $18 : FM muting switch. (off scan level)
12, $20 : Power switch in ‘’‘on’’ position.
13, $21 : Voltage selector switch in.’’220V"’ position.
110V «+ 120V «++ 220V «+ 240V
14. $701 : Main power switch in ‘‘on" position.
15. Indicated voltage values are the standard.values for
the unit measured by the DC electronic circuit tester
(high-impedance) with the chassis taken as standard.
Therefore, there may exist some errors in the voltage
values, depending on the internal impedance of the
DC circuit tester.
* Figures in [____] stand for DC voltage in FM
signal (monaural) reception mode.
*Figuresin? _) stand for DC voltage in FM
stereo signal reception mode.
* Figures in ( ) stand for DC voltage in AM
signal reception mode.
*Figuresin < > stand for DC voltage in FM-IF
super narrow condition mode.
16. <—)FM signal qoo0oFM OSC
ea AM signal eneapAM OSC
AF signal lines
17. Positive voltage lines and negative voltage lines.
18. Important safety notice:
Components identified by A mark have special
characteristics important for safety, When replacing ©
any of these components, use only manufacturer's
specified parts.
19. The waveforms o~ ©: Refer to page 17.
Note 2:
© Use of ceramic filters in pairs
The ceramic filters (CF 101 ~ CF104) for FM-IF circuit
are available in four ranks, For this machine, be sure to
use the ceramics of the same rank in a pair.
At repairing and replacement, pay close attention to the
diodes (D901, D902) for use as different diodes must be
used depending on each rank of the ceramic filters.
sk ata (ecian | 20t pe02 | eRFQUENCY ]
, Black | x oO 10.65 MHz
SFE | Red x x 10.70 MHz
107 MHz Blue O x 10.67 MHz
Orange Oo Hi O | 10.73 MHz
Note: O Mark Diode is used.
X Mark Diode is not used,

Technics Quartz ST-G7 Specifications

General

Brand	Technics
Model	Quartz ST-G7
Category	Tuner
Language	English