Technics RS-TR474 - Service Manual

Dolby
NR-Equipped
Stereo
Double
Cassette
Deck
*
Dovey
e-e
na
nx
PAO)
AR-1
MECHANISM
SERIES
SPECIFICATIONS
Wi
CASSETTE
DECK
SECTION
Deck system
Track system
Stereo cassette deck
4-track, 2-channel
Recording
system
AC
bias
Bias
frequency
80kHz
Erasing
system
AC
erase
Heads
DECK
1
Playback
head
(Permalloy)
x
1
;
DECK
2
Recording/Playback
head
(Permalloy)
x
1
Erasing
head
(Doubie-gap
ferrite)
x
1
Motors
DECK
1
Capstan
drive
(DC
servo
motor)
x
1
Reel
table
drive
(DC
motor)
x
1
DECK
2
Capstan
drive
(DC
servo
motor)
x
1
Reel
table
drive
(OC
motor)
x
1
Tape
speed
4.8omisec.
(1-7/8ips)
Wow and flutter
For (E, EB, EG) areas
Fast
forward
and
rewind
times
0.1% (WRMS)
+0.2% (DIN)
Approx.
50
seconds
with
C-60
cassette
tape
-
Frequency
response
(Dolby
NR
off)
NORMAL
40Hz—15kHz+3dB
For
(P,
PC)
areas
20Hz—17kHz
For
others
20Hz—
16kHz
(DIN)
CcrO,
40Hz—15kHz+3dB
For
(P,
PC)
areas
20Hz—17kHz
For
others
20Hz—
16kHz
(DIN)
Technics
rvice
Manual
ORDER NO. AD9401007C5
Cassette Deck
RS-TR47/4
Colour
(K)... Black Type
Aréa A..Golour
Area
Suffix fer~
Model No.
a
[©
|
europe
|
(EB)
Great
Britain.
com
Germany
and
Italy.
*
Dolby
noise
reduction
and
HX
Pro
headroom
extension
manufactured
under
license
from
Dolby
Laboratories
Licensing
Corporation.
HX
Pro
originated
by
Bang
and
Olufsen.
“DOLBY”,
the
double-D
symbol
and
“HX
PRO”
are
trademarks
of
Dolby
Laboratories
Licensing
Corporation.
METAL
40Hz—16kHz+3dB
For
(P,
PC)
areas
20Hz—
18kHz
For
others
20Hz—17
kHz
(DIN)
SIN
(Signal
level=max
recording
jevel,
CrO,
type
tape)
NR
off
56dB
(A
weighted)
Dolby
B
NR
on
666B
(A
weighted)
Dolby
C
NR
on
74dB
(A
weighted)
.
Input
sensitivity
and
impedance
REC
(IN)
10OmMV/47
kK
Output
voltage
and
impedance
PLAY
(OUT)
500
mV/500Q
HEADPHONES
For
(E,
EB,
EG)
areas
30mVI(8Q)
(Load
impedance
8Q—-600Q)
Mi GENERAL
Power
consumption
24W
Power supply
For (P, PC) areas
For others
Dimensions
(W
x
H
x
D)
430
x
136
x
285mm
(16-15/16"
*
5-5/16"
x
11-7/32")
Weight
4.4kg
(9.7
Ib.)
AC 60Hz, 120V
AC
50/60Hz,
230V—240V
Note:
Disign
and
specifications
are
subject
to
change
without
notice.
Weight
and
dimensions
are
approximate.
S673

Technics RS-TR474 Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Frequency Response	20Hz to 17kHz (Metal tape)
Type	Cassette Deck
Heads	1 x Record/Playback, 1 x Erase
Motor	DC motor
Output	400mV (Line)
Dimensions	430 x 125 x 290mm
Power Supply	220-240V AC, 50Hz

Summary

SPECIFICATIONS

CASSETTE DECK SECTION

Details deck system, track, recording, heads, motors, tape speed, and frequency response.

SAFETY PRECAUTION

INSULATION RESISTANCE TEST

Procedure for testing insulation resistance to prevent electrical shock hazards.

CAUTION FOR AC MAINS LEAD

(For EB) area only

PLAYBACK

Dolby Noise Reduction System

Dolby HX-Pro Headroom Extension

RECORDING (Deck 2 only)

ABOUT THE ATC FUNCTION

SELF-DIAGNOSTIC

DISASSEMBLY INSTRUCTIONS

WRITING TO EEPROM

MEASUREMENTS AND ADJUSTMENTS

HEAD REPLACEMENT

TROUBLESHOOTING GUIDE

TERMINAL FUNCTION OF IC

BLOCK DIAGRAM

REPLACEMENT PARTS LIST

RESISTORS AND CAPACITORS