Technics SU-7700 Service Manual

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2SA56 2SA564A
RECT Q MUTING/PROTECTION RELAY DRIVE
Notes:
1. S1~S3_: Input selector switch in ‘'PHONO"” push position.
S1...(PHONO) S2...(TUNER) S3...(AUX)
2. S4: Equalizer subsonic filter switch in ‘'ON” position. |
3. S5: Tape monitor switch in “SOURCE” position.
(2) (TAPE 1) ++(@) (SOURCE) ++ @ (TAPE 2)
4. S6: Recording mode switch in ‘‘SOURCE” position.
(2) (TAPE 1 ® 2)«+@ (SOURCE)++@ (TAPE 2 » 1)
5. S7: Mode switch in “STEREO” position.
6. S8: High filter switch in “OFF” position
7. SQ: Loudness switch in ‘‘OFF”’ position.
8. S10: Main speakers switch in ‘‘ON” position.
SU-7700
10.
11.
12.
14.
S11: Remote speakers switch in ‘‘ON” position.
S12: Meter range selector switch in ‘‘X1"' position (X 1<— X0.1)
$13: Power switch in ““OFF” position.
$14-1,S14-2: Voltage selector switch in ‘‘110V” position.
@ (110V) + @ (120V) ++ @) (220V)++@ (240Vv)
[—_]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.
This schematic diagram may be modified at any time with the develo-
pment of new technology.
m@ SCHEMATIC DIAGRAMS OF POWER SOURCE
e
only
set
for
[XSD],
[XSW],
@
only
set
for
[XAL]
@
only
set
for
[XE]
[XGF],
[XG]
and
[XGH]
————-—--——--—-------4
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Fl
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RED
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To
voltage
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To
volt
|
| AC LINE selector | 1 AC LINE $13 saleetare ]
| 110/120/220/240V | 110/120/220/240V
aa | | o— | oe
@ TR. & 1.C. TERMINAL GUIDE m@ BLOCK DIAGRAM OF INTEGRATED CIRCUIT
1C101, 1C102
(SVITA7136P) POWER
SUPPLY
2SA564 / 2SA564A
2SC828 / 2SC828A
2SC1885 , 2S5C1328
DIFFERENTIAL
AMPLIFIER |
CURRENT MIRROR
CIRCUIT
ie Ae Nera s Be oe
SU-7700

Technics SU-7700 Specifications

General

Damping factor	30
Input sensitivity	2.5mV (MM), 150mV (line)
Output	150mV (line)
Speaker load impedance	4Ω to 16Ω
Power output	50 W per channel into 8Ω (stereo)
Signal to noise ratio	95dB (line)
Channel separation	55dB (MM)