Sony tc k 777 es service manual

Page 2

TC-K777ES

Fixed line outputs (phono jacks)
Output level 0435 V (-5 dB) at a load
impedance of 50 k ohms
Load impedance over 10 k ohms
Variable line outputs (phono jacks)
Maximum output level 0.435 V (*5 dB)
at a load impedance of 50 k ohms
with LINE OUT level control at 0"
Variable in five steps from -5 dB to
-29 dB
Load impedance over 10 k ohms
Headphone output
Output level variable in five steps from
~20 dB to ~44 dB at a load impedance of
8 ohms

Tape Transport Mechanism TOM-12003
0 dB = 0.775 V

Outputs

General

Power requirements 220 V ac, 50/60 Hz

(240 V ac adiustable by authorized
Sony personnel)

Power consumption 50 watts

Dimensions Approx, 430 x 105 x 390 mm (w/h/d)
(16/. X4/. X 153/. inches)
including projecting parts and controls
Weight Approx 100 kg (22 lbs 1 oz)

LED peak program meters
Response range 740 dB to +10 dB
Frequency response 20 - 20,000 Hz :1.5 dB
Response time 1 millisecond
Decay time (from 0 dB to -20 dB)

750 milliseconds

Overshoot none
Indicator elements 30 elements for each channel
Note

Appliance conforms with EEC Directive 76/889 regarding inter-
ference suppression

FEATURES

Threehead system

Separate record and playback heads allow optimum gap settings
and impedance ratings for distortion-free recording and greatly ex-
tended frequency response For good tape»to-head contact the
heads are mounted in one block and each head is separately ad~
justed for precise azimuth alignment. The three-head system also
enables you to monitor the recorded tape while actually recording,

Newly-developed LA (LaserAmorphous) heads

The record and playback heads are made of a special amorphous
magnetic alloy developed by Sony, and its cores are solidly welded
by laser. This new highly-durable head provides a wider dynamic
range and a more extended frequency response, especially in the
high-frequency range The head is designed to take full advantage

of the potential of the metal tapes

Closed-loop dual-capstan tape drive system

Two pairs of capstans and pinch rollers ensure uniform tape ten»
sion and stable tape-to-head contact As a result, wow and flutter

and modulation noise are greatly reduced.

Very stable tape speed

The motors for the capstan and reel drives are linear torque BSL
(brushless and slotless) motors with an extremely smooth torque
The speed of the capstan motor is regulated by a crystal oscillator,
The shaft of the capstan motor drives the tape directly to eliminate
any fluctuation in the tape speed which might be caused by belts or

idlers.

Bias and record level calibration

Bias current can be precisely adjusted to the optimum level for any
tape on the market, assuring the flattest possible frequency
responses Furthermore, the sensitivity of the tape can be compen-
sated for, permitting optimum performance of the Dolby NR
system.

Vibration-tree aluminum alloy chassis

The chassis of the tape transport mechanism is made of 3 mm (1/.
in) thick aluminum alloy plate, which suppresses resonance of the
chassis and greatly reduces the transmission of vibration to the
tape.

The chassis of the amplifier section is of copper-plated steel hav-
ing 5 sides, which prevents eddy-current from circulating and
reduces harmonic distortion,

High-quality amplifier section

This cassette deck incorporates a dc amplifier design which
assures true fidelity down to the dc region.

The recording section and the playback section of the right and left
channels are physically separated with the signal paths of the right
and left channels parallel, using the symmetric Dolby NR le. The
channel circuits themselves are well separated by a busbar to
eliminate interference.
The electronic components used have been carefully selected to
provide the highest possible sound quality, as exemplified by the
gold-plated input and output jacks and the use of a newly»
developed dual FET.

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