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CARE OF YOUR AMPLIFIER
TROUBLE CHECKS
The following chart will help correct most troubles which may oc-
cur with the unit.
If the trouble persists after you have made these
checks, consult your Sony dealer.
Before
going through
the check
list of specified troubles below,
first refer back to the "CONNECTION
DIAGRAM"
on page 5 and
"INITIAL OPERATION"
on page 8.
No audio and the PEAK POWER
LEVEL indicators not lit
@ Check that the ac power cord is plugged into a working outlet.
No audio but the PEAK POWER LEVEL indicators light
@ Check speaker and program source connections.
@Check the settings of the MONITOR and FUNCTION switches.
@ Check the SPEAKERS
selector setting.
@Turn
up the volume.
Abrupt loss of sound from one or both of the speakers *
@ Check the speaker terminals or speaker cord for a short.
@ Check for a connected audio component which might generate a
de content that affects the amplifier.
@ Remove any object on the top of the cabinet which might prevent
normal air circulation.
No TONE contro! adjustment
@ Depress the TONE switch of the SIGNAL
PATH switches.
No tape recording
@ Check that the TAPE COPY selector is set at SOURCE.
No tape copying
@ Check the TAPE COPY selector to see if it is correctly set.
Reversed left and right sound
@ Check the speaker cord connection and speaker location.
Lack of bass sound or obscure instrument position
@ Check the speaker connection for proper phasing.
Severe hum or noise
@ Use shielded connecting cords.
@ Keep the connecting cords away from transformers or motors
and at least 3 meters from TV sets and fluorescent lights.
@ Ground the amplifier.
Rustling noise
@ Make secure connections.
eWipe
the plugs and jacks with a cloth lightly dampened
with
methanol.
An intermittent mechanical noise is slightly audible after the unit
has been run at high volume levels
@ This condition is inherent in the heat-pipe design and is not a pro-
blem.
*This symptom
may be caused when the protection circuits activate.
CLEANING
Clean the cabinet, panel and knobs periodically with a soft cloth.
If finger prints, food and beverage stains, etc. are difficult to
remove, use a cloth moistened with a mild detergent solution.
Do
not use any type of scouring powder, abrasive pad or solvent, since
these will damage the cabinet.
12
SPECIFICATIONS
Amplifier section
Continuous RMS power output
(Less than 0.007%
At1kHz
THD, both channels
90 + 90 watts (8 ohms)
driven simultane-
At 20 Hz - 20 kHz
ously)
90 + 90 watts (8 ohms)
According to DIN 45500
90 + 90 watts (8 ohms)
Power bandwidth (IHF)
5 Hz - 30 kHz
Harmonic distortion
Less than 0.007%
at rated output
Less than 0.003%
at 10 W output
Intermodulation (IM) distortion
(60 Hz: 7 kHz = 4: 1)Less than 0.007%
at rated output
Less than 0.003%
at 10 W output
Frequency response
PHONO
1, 2 RIAA equalization curve
+0.2 dB
TUNER
AUX
TAPE 1, 2
Less than 100 yV (8 ohms, Network A)
100 (8 ohms, 1 kHz)
) DC - 100 kHz *?dB
Residual noise
Damping factor
Inputs
Maximum
input
S/N
Bony
capability
(weighting
Sensitivity | Impedance | (9 ag7e distor
| network,
tion, 1 kHz)
input level)
PHONO 1, 2
(PASS)
2.5 mV
50 k ohms
goomv
| 88 dB (A, 2.5 mV)
(40 Q)
0.125 mV
100 ohms
15 mV
__ | 78 dB (A, 0.26 mV)
(3.2)
0.125 mV
33 ohms
15 mV
78 dB (A, 0.25 mV)
TUNER
AUX
150 mV
50 k ohms
—
ree nag)
TAPE 1,2
Gs
Outputs
REC OUT 1, 2
Voltage 150 mV
Impedance 4.7 k ohms
SPEAKER
A, B
Accepts speakers of 8 - 16 ohms.
HEADPHONES
Accepts low and high impedance
headphones.
Tone controls
BASS
+10 dB at 25 Hz (turnover frequency
250 Hz)
TREBLE
+10 dB at 50 kHz (turnover frequency
5 kHz)
Low filter
12 dB/octave attenuation
below 15 Hz
(operative only for phono input signals)
General
System
Preamplifier section:
low-noise head
amp;
direct-coupled, NF type
equalizer amp;
CR type tone control
Power amplifier section:
pure-comple-
mentary SEPP de power amplifier with
all stages direct coupled
Power supply section:
pulse-power
supply circuitry ; two regulated
power supplies (for head amp and
preamp)
Semiconductors
6 ICs, 6 FETs, 78 transistors, 56 diodes
Power requirements
European model:
220 V ac, 50/60 Hz
United Kingdom model :
240 V ac, 50/60 Hz
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