Page 1
MX-GT700
1-2
1. This design of this product contains special hardware and many circuits and components specially for safety
purposes. For continued protection, no changes should be made to the original design unless authorized in
writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services
should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product
should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further
relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily
be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual. The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.
4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.
Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Voltage measured any must not exceed 0.75 V
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
Good earth groundPlace this
probe on
each exposed
metal part. AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
Burrs formed during molding may
be left over on some parts of the
chassis. Therefore, pay attention to
such burrs in the case of
preforming repair of this system.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "
mark nearby are critical for safety.
(This regulation does not correspond to J and C version.)
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MX-GT700
1-3
^
Importance administering point on the safety
Fuse board (Forward side)Power supply board (Forward side)
4A 125V
4A 125V
RFS9
RFS2
Caution: For continued protection against risk of fire,
replace only with same type 4A/125V for RFS2 and
RFS9.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez le
fusible de surete de et RFS2 et RFS9 comme le
meme type que 4A/125V.
Ce sont des fusibles suretes qui functionnes rapide.
Page 37
MX-GT700
1-38
TDA7442D (FIC1) : Audio processor
1.Pin layout
2.Block diagram
L-IN1
L-R 0.47
F
SUPPLY
V
S
AGND
CREF
TREBLE BASS
BIN(L)
MUTE
D98AU947A
I2
C BUS DECODER + LATCHESSPKR
ATT
TREBLE BASS
5.6nF
MUTE
SPKR
ATT
SCL
SDA
DIG GND
ROUT LOUT
22
F
+- +
-
+
R-IN4 0.47
F
50KPS1
90Hz 100nF
PS1
RPS1
SYMULATED
MUSICMUSIC/
SYMULATED
OFFMIXING AMP
LPF
9KHzEFFECT CONTROLMIXING AMP
1.2nF LP 417
28
24 25 23
16
14
27
1221
22
20
26
TREBLE-R
5.6nF
TREBLE-L
100nF5.6K 100nF
BOUT(L)
100nF 100nF 5.6K BIN(R) BOUT(R)
79dB CONTROL
+
-
+-79dB CONTROL 15
13 19
18
50K 0.47
F 50K 0.47
F 50K 0.47
F
50K 0.47 F
50K 0.47 F
50K 0.47 F
50K
31.5dB
control R-IN3 R-IN2 R-IN131.5dB
control
L-IN2
L-IN3
L-IN4
5
6
7
3
2
1
VrefOFF
SURR
OFF
SURR
RBFIX
FIX
VAR
RB
FIX
VAR
L+R
30K
30K
9 8 2.2
F
11 10
2.2 F MUXOUT(R)
IN(R)
MUXOUT(L) IN(L)
L_IN3
L_IN4
MUXOUTL
IN(L)
MUXOUT(R)
BIN(R)IN(R)
BOUT(R)
BIN(L)1
3 2
4
5
6
7
8
9
BOUT(L) LP PS1 TREBLE(R)
TREBLE(L) SCL SDA
DIG-GNDCREF 23
22
21
20
19
17 18
16
15 10
11
12
13
1428
27
26
25
24 R_IN3
R_IN2
R_IN1
L_IN1
L_IN2 V
S
AGND ROUT LOUT
R_IN4
BA4560 (AIC3, AIC4, AIC5, AIC6, AIC7, FIC4, HIC1) : Dual op amp.
1.Pin layout
-“ + +
-“ 1
2
3
48
7
6
5 OUT1
-“ IN1
+ IN1
V
EE
VCC
OUT2
-“ IN2
+ IN2 1ch
2ch