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Technics RS-CH770

Technics RS-CH770
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ORDER
NO.
AD9603056C8
Service
Manual
Stereo
Cassette
Deck
Cassette
Deck
System:
SC-CH770
OU
[DOLBY
B
NR
|*’
R
S
=
C
+
vA
vA
O
*2.*3
§B-CH770
*2,*3
SB-PC10
*2.*9
SB-CH770
ST-CH770
SL-CH770
Colour
(K)
:
Black
ySBPSIO
poe
Suffix
for
Area
Colour
Model
No.
Europe,
Asia,
Latin
America,
Middle
East,
Africa
and
Oceania
*2,*3
SB-PS10
RS-CH770
SE-CH770
Remote
Control
Transmitter
System:
SC-CH570
*2.*3
§B-CH570
*2.*3
SB-PC570
*2.*3
SB-CH570
*2
$B-PS570
#
*2$B-PS570
*1:
Dolby
noise
reduction
manufactured
under
or
i
i
i
or
license
from
Dolby
Laboratories
Licensing
*3SB-PS10
|
So
ee
as
|
gai?
SB-PS10
Corporation.
:
as,
re
“Dolby”
and
the
double-D
symbol
are
trade
marks
of
Doiby
Laboratories
Licensing
Corporation.
Remote
Control
Transmitter
RS-CH770
SE-CH570
AR-2
MECHANISM
SERIES
Specifications
(IH
F
78)
Frequency
response
(Dolby
NR
off)
.
TYPE
I
(NORMAL)
20
Hz-1
6
kHz
(DIN)
@
Cassette
Deck
Section
TYPE
II
(HIGH)
20
Hz-1
6
kHz
(DIN)
Deck
system
Stereo
cassette
deck
TYPE
IV
(METAL)
20
Hz-1
6
kHz
(DIN)
Track
system
4-track,
2-channel
S/N
(signal
level
=
max
recording
level,
TYPE
II
type
tape)
Recording
system
AC
bias
NR
off
56
dB
(A
weighted)
Bias
frequency
100
kHz
Dolby
NR
B
on
66
dB
(A
weighted)
Erasing
system
AC
erase
Input
sensitivity
and
impedance
Heads
REC
(IN)
400
mV/23
kQ
DECK
1
Playback
head
(Permalloy)
x
1
Output
voltage
and
impedance
DECK
2
Recording/Playback
head
(Permalloy)
x 1
PLAY
(OUT)
280
mV/360
O
Erasing
head
(Double-gap
ferrite)
x
1
Hi
General
Motors
:
;
DECK
1,
2
Capstan
drive
(DC
servo
motor)
=
1
Dimensions
(W
x
Hx
D)
270
x
118.5
«
269.5
mm
Tape
speed
4.8
cm/sec.
weelant
1.9
kg
Wow
and
flutter
0.16%
(WRMS)
Notes:
Fast
forward
and
rewind
times
Specifications
are
subject
to
change
without
notice.
Approx.
110
seconds
with
C-60
cassette
tape
Weight
and
dimensions
are
approximate.
Tuner/sound
Compact
disc
el
System
processor
player
Amplifier
Cassette
deck
|
Front
speakers
|
Center
speaker
|
Surrournd
speakers
SC-CH770
ST-CH770
SL-CH770
SE-CH770
¥2.*3SB-CH770
|
*2°°SB-PC10
|
*°°3
SB-PS10
*2
SB-PT570
SC-CH570
ST-CH570
SL-CH570
sE-cH5s70
|
FS
CH770
|
s2s358.cH570
|
“SB-PCS70
*2SE3-PS570
*3SB-PT570A
*3
SB-PC570
“8S
B-PS10
*2
For
Europe
area:
oo...
Made
in
PAES
*3
Except
for
Europe
area:
.....
Made
in
NABEL
©
1996
Matsushita
Electric
Indusiriaal
Co.,
Ltd.
e
®
:
All
rights
reserved.
Unauthorized
c
©pying
i
ec
]
and
distribution
is
a
violation
of
law.
re
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Technics RS-CH770 Specifications

General IconGeneral
TypeDouble Cassette Deck
Track System4-track, 2-channel stereo
Tape Speed4.76 cm/s
OutputsLine Out, Headphone Out
Recording SystemAC bias
MotorDC Motor
OutputLine Out
InputsLine In

Summary

AR-2 Mechanism Series Specifications (IHF 78)

Cassette Deck Section

Detailed specifications for the cassette deck, including track system, heads, and motors.

General Specifications

General performance parameters like frequency response, dimensions, and weight.

Location of Controls

Operation Checks and Component Replacement

Checking Procedures for PCBs

Guides for checking the operation of main and power supply printed circuit boards.

Main Component Replacement Procedures

Step-by-step instructions for replacing major components like cassette lids, heads, and motors.

Service Mode Function

Deck 1 Mechanism Check

Procedure to check Deck 1 mechanism using LED indicators and cassette holder illumination.

Deck 2 Mechanism Check

Procedure to check Deck 2 mechanism using LED indicators and cassette holder illumination.

Measurements and Adjustments

Power Supply and Signal Checks

Procedures for supplying power and checking audio signals using test points.

Head Azimuth and Tape Speed Adjustments

Steps for adjusting head azimuth and tape speed for both decks.

Playback Gain and Erase Current Confirmation

Procedures for adjusting playback gain and confirming erase current.

Frequency Response Checks

Methods for checking playback and record/playback frequency response using test tapes.

Schematic Diagrams

Main Circuit Schematic

Detailed schematic for the main audio and control circuits of the cassette deck.

Mechanism Circuit Schematics

Schematics detailing the mechanical operation of Deck 1 and Deck 2 mechanisms.

Power Supply and Operation Circuit Schematics

Schematics for the power supply and operational control circuits.

Printed Circuit Board Layouts

Main PCB Layout

Diagram showing component placement on the main printed circuit board.

Mechanism and Operation PCB Layouts

Diagrams illustrating component placement on mechanism and operation PCBs.

Wiring Connection Diagram

IC Terminal Functions

Block Diagram

Replacement Parts List

Cabinet Parts Location

Mechanism Parts Location

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