Sony LBT-A199 User manual

LBT-A199/D200/62000
SERVICE MANUAL US Model
R
VIS
LBT-D250/G2000
EVISED
Canadian
Model
Discard
LBT-A195/D250/G2000
Service
Manual
(No.
9-959-
LBT-A195/G2000
306-13) previously issued. This Service Manual contains it.
UK Model
* LBT-A195/D250/G2000 are composed of following models. E Model
As for the service manual, it is issued for each component model, LBT-A195
then, please refer to it.
COMPONENT MODEL NAME FOR THESE SYSTEM
Two [ke Tm fs fs [cu |
COMPACT
DISC
STEREO DECK ~ HCD-A195 HCD-D250 HCD-G2000
RECEIVER
SPEAKER
oat SS-G2000 ea SS-D195 $S-D255 | ss-c2000 | G2000
[Turn
Taste
|
PS-LXB6P
bee
-2=
CND : Canadian Model NOTE :
MX _ : Mexican Model @ Items marked "*" are not stocked since they are
seldom required for routine service. Some delay
PARTS LIST should be anticipated when ordering these items.
Part No. Description Part No. Description
1-467-430-11 | COMMANDER, STANDARD (RM-S221) | 4-937-945-11 | PLATE (TRANSPORT), LOCK (HCD)
1-501-374-11 | ANTENNA, LOOP * 4-957-532-01 | SNOW BOX (L) (PS-LX56P)
1-501-659-41 ANTENNA (FM) * 4.957-533-01 | SNOW BOX (R) (PS-LX56P)
2-181-754-21 COVER (MLY), BATTERY (for RM-S221) | * 4-963-172-01 INDIVIDUAL CARTON (G2000 : US)
3-376-136-01 | CUSHION (HALF) (HCD) * 4.963-173-02 | CUSHION (HCD)
3-758-284-11 | MANUAL, INSTRUCTION (UK) (ENGLISH)| * 4-963-176-01 INDIVIDUAL CARTON (D250)
3-758-284-21 | MANUAL, INSTRUCTION (US) * 4.963-177-01 INDIVIDUAL CARTON (A195 : CND)
*
*
*
*
*
*
*
(ENGLISH, SPANISH) 4-964-535-01 CUSHION (SS-D255/G2000)
3-758-284-31 MANUAL, INSTRUCTION (A195 : CND) 4-964-536-01 CUSHION (SS-D195)
(ENGLISH, FRENCH) 4-968-317-01 INDIVIDUAL CARTON (A195 : E)
3-758-592-11 | MANUAL, INSTRUCTION (E, MX) 4-968-318-01 INDIVIDUAL CARTON (A195 : MX)
(ENGLISH, FRENCH,SPANISH, CHINESE) 4-968-816-01 INDIVIDUAL CARTON (A195 : UK)
3-758-592-51 MANUAL, INSTRUCTION (G2000 : CND) 4-971-630-01 INDIVIDUAL CARTON (G2000: CND)
(ENGLISH, FRENCH) A-4674-087-A TURN TABLE MAT ASSY (PS-LX56P)
COMPONENT HI-FI STEREO SYSTEM
Sony
Corporation
Ss
O
N
Y.
Consumer A&V Products Company English
: 95B809046-1D
9-959-306-14
Home
A&V
Products
Div.
Printed
in
Japan
©
1995.2
Published by Home A&V Products Div. Quality Engineering Dept.

$5-D299/62000
SERVICE MANUAL US Model
Canadian Model
SPECIFICATIONS
Speaker System 2-way speaker system (SS-G2000)
3-way speaker system (SS-D255)
Mass Approx. 3 kg PC speaker
(6 lb 10 oz)
Dimensions Approx. 220 X 395 X 180 mm
(85/4 X 15%, X 77/. inches)
(w/h/d, including projections)
Design and specifications are subject to change without notice.
Photo: SS-G2000
SS-D255 is the speaker system in LBT-D150 and LBT-
D250.
SS-G2000 is the speaker system in LBT-G1000, LBT-A190,
LBT-G2000 and LBT-A195.
SPEAKER SYSTEM
SONY.

EXPLODED VIEW AND PARTS LIST
NOTE:
@ -XX and -X mean standardized parts, so they @ Items marked “**” are not stocked since they @ The mechanical parts with no reference
may have some difference from the original are seldom required for routine service. Some number in the exploded views are not
one. delay should be anticipated when ordering supplied.
these items.
1
A
wee aN es
C pd S
| \
[| SQ SY?
§)) >)
| |
Is |
A Enea eee re
SS-G2000 SS-D255
Ref.No. Part No. Description Remark Ref. No. Part No. Description Remark
1 X~4944-220-1 FRAME ASSY, GRILLE ACCESSORIES & PACKING MATERIALS
2 4~874-614-61 SCREW (M3. 5X16) PeETtrirtrr tt ttt ttt ttt tte tty
+3 A-4353-685-A CABINET ASSY, SPEAKER (62000)
+3 A-4353-678-A CABINET ASSY, SPEAKER (D255) + 4-964-535-01 CUSHION
4 1-575-696-11 CORD, SPEAKER (WITH(C))
+5 X-4944-221-1 DUCT ASSY, ORNAMENTAL (62000)
* 6 X-4944-224-1 DUCT (L) ASSY, ORNAMENTAL (D255)
+7 X-4944-225-1 DUCT (R) ASSY, ORNAMENTAL (D255)
SP1 1-504-173-11 SPEAKER (16cm)
SP2 —_1-504-174-11 SPEAKER (Scm)
SP3-1-544-453-21 SPEAKER (2cm) (D255)
English
93L0533-1D
Sony Corporation Printed in Japan
9-959-266-11 Audio Group © 1993. 12
—2— Published by Audio Sector Quality Assurance Dept.

HCD-A195/0250/62000
—
SERVICEMANUAL
US
Model
HCD-D250/G2000
Canadian Model
HCD-A195
HCD-A195, HCD-D250 and
HCD-G2000 are the tuner,
deck, CD and amplifier section
in LBT-A195, LBT-D250 and
LBT-G2000
respectively.
Photo:
HCD-G2000
SPECIFICATIONS
a
Model
Name
Using
Similar
Mechanism
CDP-411/511/D7
Section
CD
Mechanism
Name
CDM14-5BD13
Base
Unit
Name
BU-5BD13
AUDIO POWER SPECIFICATIONS
(US
model)
DECK
|
Model
Name
Using
Similar
Mechanism
|
HTC-D159
POWER
OUTPUT
AND
TOTAL
Section]
Tape
Transport
Mechanism
Type
TCM-180VW-H11
HARMONIC
DISTORTION
:
With
6-ohm
loads,
both
channels
driven,
Tuner
from
70—15,000Hz;
rated
10
watts
per
System
BM
Stereo
h
inn
RMS
ith
|
h
FM/AM
superheterodyne
tuner
channel
minimum
RMS
power,
with
less
than
FM
tuner-section
10%
total
harmonic
distortion
from
250
Tuning
range
87.5
to
108MHz
milliwatts
to
rated
output.
Antenna
300
ohms
balanced
75
ohms
unbalanced
Amplifier
Intermediate
frequency
10.7MHz
Continuous
RMS
power
output
AM
tuner
section
10W+10W
(6
ohms,
at
1kHz,
Tuning
range
AM:
530
to
1,710kHz
5%
THD)
Antenna
AM
loop
antenna
r
ear
External
antenna
terminal
Input
Jack
type
Sensitivity
Impedance
Intehnediate
frequency
450k
Es
VIDEO
Phono
300
mV
47
kilohms
(G2000)
Cassette
deck
PHONO
Ph
3
mV
AT
kiloh
Recording
system
4-track
2-channel
stereo
(A195/D250)
ono
pons
|
Frequency
response
DOLBY
NR
OFF
With
Type
II
cassette
(Sony
UX-S)
0
“i,
k
.
F
40Hz
to
14kHz
(+3dB)
besides
Jack
type
MPEGANCE
With
Type
I
cassette
(Sony
HF-S)
HEADPHONES
|
Stereophone
|
Accepts
headphones
of
40Hz
to
13kHz
(+3dB)
8
ohms
or
more
Wow
and
flutter
W.
PEAK
£0.2%
(DIN)
(A195)
0.1%
(WRMS)
(D250/G2000)
Frequency
response
15Hz
to
50kHz
*§
dB
—continued on next page—
COMPACT
DISC
DECK
RECEIVER
SON
Y.

Compact
tise:
mayer
SAFETY
CHECK-OUT
(US
Model)
Laser Semiconductor laser
Wavelength 780—790nm
Frequency
response
2Hz
to
20kHz+1dB
After
correcting
the
original
service
problem,
Signal-to-noise
ratio
More
than
93dB
perform
the
following
safety
check
before
releasing
Dynamic range More than 90dB the set to the customer:
ee ‘ x
Harmonic
distortion
Less
than
0.01%
(IkHz)
Check
the
antenna
terminals,
metal
trim,
‘“‘metallized”
Channel separation More than 90dB (1kHz)
knobs, screws, and all other exposed metal parts for
General AC leakage. Check leakage as described below.
Power requirements 120V AC, 60Hz
Power consumption 45W LEAKAGE TEST
Mass Approx. 9.9kg (20 Ib 14 oz)
Dimensions
Approx.
355
x
395
x
405mm
The
AC
leakage
from
any
exposed
metal
part
to
(14X155/, X 16 inches)
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (500 microampers). Leakage
(w/h/d, including projections)
Supplied accessories
Remote commander RM-S221 (1) current can be measured by any one of three
Batteries Sony SUM-3 (NS) (2) methods.
ENE ie anterae () 1. A commercial leakage tester, such as the
AM
loop
antenna
1)
Simpson
229
or
RCA
WT-540A.
Follow
the
manufacturers’ instructions to use these instru-
ments.
Design and specifications are subject to change without notice.
i)
A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt- |
meter. The ‘limit’ indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
| (0.75 V}
Dolby noise reduction manufactured under license from Dolby Labora-
tories
Licensing
Corporation.
=
Earth
Ground
"DOLBY" and the double-D symbol 9 are trademarks of Dolby Labora-
tories
Licensing
Corporation.
Fig.
A.
Using
an
AC
voltmeter
to
check
AC
leakage.
SAFETY-RELATED COMPONENT WARNING!! ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINE WITH
MARK
/\
ON
THE
SCHEMATIC
DIAGRAMS
AND
IN
THE
PARTS
LIST
LES
COMPOSANTS
IDENTIFIES
PAR
UNE
MARQUE
/\
SUR
LES
DIA-
ARE
CRITICAL
TO
SAFE
OPERATION.
REPLACE
THESE
COMPONENTS
GRAMMES
SCHEMATIQUES
ET LA
LISTE
DES
PIECES
SONT
CRI-
WITH
SONY
PARTS
WHOSE
PART
NUMBERS
APPEAR
AS
SHOWN
IN
TIQUES
POUR
LA
SECURITE
DE
FONCTIONNEMENT.
NE
REMPLACER
THIS
MANUAL
OR
IN
SUPPLEMENTS
PUBLISHED
BY
SONY.
CES
COMPOSANTS
QUE
PAR
DES
PIECES
SONY
DONT
LES
NUMEROS
SONT DONNES DANS CE MANUEL OU DANS LES SUPPLEMENTS
PUBLIES PAR SONY.

NOTES
ON
HANDLING
THE
OPTICAL
PICK-UP
BLOCK
OR
BASE
UNIT
The
laser
diode
in
the
optical
pick-up
block
may
suffer
electrostatic
break-down
because
of
the
potential
difference
generated
by
the
charged
electrostatic
load,
etc.
on
clothing
and
the
human
body.
During
repair,
pay
attention
to
electrostatic
break-down
and
also
use
the
procedure
in
the
printed
matter
which
is
included
in the repair parts.
The
flexible
board
is
easily
damaged
and
should
be
handled
with care.
NOTES
ON
LASER
DIODE
EMISSION
CHECK
The
laser
beam
on
this
model
is
concentrated
so as
to
be
focused
on
the
disc
reflective
surface
by
the
objective
lens
in
the
optical
pick-up
block.
Therefore,
when
checking
the
laser
diode
emission,
observe
from
more
than
30
cm
away
from
the
objective
lens.
MODEL IDENTIFICATION
—Label Model Number—
Canadian model: HCD-A195
US model: HCD-D250
US model: HCD-G2000
SON Ye move. no W777
COMPACT DISC DECK RECEIVER
AC: 120V 60H 45W
HCD-D250 : 4-962-737-01. U (HF)
HCD-G2000: 4-962-737-11. U (GS)
HCD-A195 : 4-962-737-21. CA
TABLE OF CONTENTS
Section
Title
Page
1.
GENERAL
Location
of
Controls..........-
sce
Meese
aR
cheodisiougtednd
4
2. DISASSEMBLY
2-1.
Case
(CDM)
......-
sce
cece
eter
enter
eens
5
9-2.
Back
Panel
..........
cece
cece
ence
rere tenn ence tens
5
9-3.
Main
Board......-..e
cece
eee
e
eee
eee
ete
e
eens
6
2.4.
Power
transformer
.......-.seeeee
cere
e
eee
n
eee
6
2-5.
CD
ASSY
...e
cece
cece
teen
terete
ee
en
ene
n
teens
7
2-6.
Cassette
Lid
ASSY
......
sce
cece
erent
ene
e
ene
7
2-7.
Mechanism
Deck
Block
.........eseee
rece
eee
eees
8
9.8.
Panel
Board
...-..
cece
cece
eee
e
ee
eee
e
eee
n
eens
8
2-9.
Disc
Table
Assy........cce
cece
cence
eee
eee
eens
9
2-10.
Bracket
(BD)
ASSy
....
sees
e
eee
eee
eens
9
3.
MECHANICAL
ADJUSTMENTS
...........
rene
10
4. ELECTRICAL ADJUSTMENTS
Deck
Section........ccc
ccc
e
cere
eect
eee
ete
nen
ees
10
Tuner
Section
........0c
cece
cece
e
eee
ee
eee
n
ene
13
CD
Section.
.....0..0cce
cece
een
cece
eee
e
nen
ene
eee
14
5. DIAGRAMS
5-1.
Circuit
Boards
Location
........eee
cece
cence
16
5-2.
Block
Diagram—Deck
Section—
....-.---+-seeee
17
5-3.
Block
Diagram—CD
Section—
.....--+.+-seseeee
19
5-4.
Block
Diagram—Tuner/Power/Panel
Section—
..21
5-5.
Printed
Wiring
Boards—Tuner/Power
Section—
..24
5-6.
Schematic
Diagram—Tuner
Section—
........----
27
5-7.
Schematic
Diagram—Power
Section—
..........+-
28
5-8.
Schematic
Diagram—CD
Section—
.......-..--+>
34
5-9.
Printed
Wiring
Boards—CD
Section—
..........-.
37
5-10.
Semiconductor
Lead
Layouts
........-...-+
eee
ee
41
5-11.
Printed
Wiring
Board—Panel
Section—
........-.
42
5-12.
Schematic
Diagram—Panel
Section—
..........--
45
5-13.
Schematic
Diagram—Deck
Section—
..........--
48
5-14.
Printed
Wiring
Boards—Deck
Section—
..........
51
5-15.
Pin
Descriptions
.......-.0:s
eee
e
erence
eee
eee
56
6. EXPLODED VIEWS
6-1.
Chassis
Section............seee
eee
cree
ene
e
ees
58
6-2.
Front
Panel
Section
.........--..eceeee
rene
eens
59
6-3.
Tray
Section..........
cece
eee
e
nent
eens
60
6-4.
CD
Chassis
Section
....-...
05.
eee
e
een
eee
eee ens
61
6-5.
Optical
Pick-up
Block
Section..........---.
ae
ite
62
6-6.
Mechanism
Deck
Section
1
...-.--.+--sss
eee
sees
63
6-7.
Mechanism
Deck
Section
2
......--.0+--
seen
eens
64
6-8.
Mechanism
Deck
Section
3
..........
0s
eee
ee
eee
65
7.
ELECTRICAL
PARTS
LIST
..........--.--.--+-+-
66
—3-

SECTION 1
GENERAL
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SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-1. CASE (CDM)
@ claws @ case (CDM)
DS we a« 8 screw (case 3 TP2)
we
@ claws
B claws
Pf
@ screw (case 3 TP2)
wy” ~~
Te
Cx. —@ BVTT3X8
2-2. BACK PANEL
© back panel
e
TS @ lead clamp
@
BVTP3x8
B
BVTP3Xx8
@ tepping screw
@ BVTP3x8

2-3. MAIN BOARD
@ MAIN board :
os
CN1206
CN1212
CN1203
CN1205
CN1211 @ connectors
CN1202
CN1204
CN1301
CN1208
@ BVTP3x8
Ce
@ PC board holder
2-4. POWER TRANSFORMER
@CN1350 = @CN1351
@ BVTT4x6 aml
@ BVTP3x8
@ power transformer
@ heat sink
O wire

2-5. CD ASSY
2-6.
CASSETTE
LID
ASSY

2-7. MECHANISM DECK BLOCK
@ Push the EJECT button.
@ mechanism deck block
2-8. PANEL BOARD
@® BVTP2.6x8
@ BVTP2.6x8
@ CD UPPER board
@ BVTP2.6x8
@ BVTP2.6x8
@ CD LOWER board
@ PANEL board
@ BVTP2.6x8
@ BVTP2.6x8
@ push switch
@ knob (SUR) knob (V)

2-9. DISC TABLE ASSY
Note on assembly: Turn the pulley assy in the direction
of the arrow.
Down the bracket (BD) assy, and
assembly the disc table assy.
© BVTP3x8
New c. (guide B)
CN305
@ BVTP3x8
@ bracket (CDM)
bracket (guide B)
@ disc table assy
@ BVTP3xX8
c DM
pulley
assy—
@p:
@
bracket
(CDM)
»
BVTP3X8
2-10.
BRACKET
(BD)
ASSY
Note
on
assembly
:
Set
to
the
arrow
portion
of
gear
(loading
A)
for
shaft
(CAM).
@ bracket (BD) assy
BVTP3X8
@
tension
spring
bracket
(BU
BASE)
we
Turn the pulley assy in the
direction of the arrow.

SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1.
Clean
the
following
parts
with
a
denatured
alcohol-
moistened swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3.
Do
not
use
a
magnetized
screwdriver
for
the
adjustments.
4.
After
the
adjustments,
apply
suitable
locking
compound
to
the
parts
adjusted.
5.
The
adjustments
should
be
performed
with
the
rated
power
supply
voltage
unless
otherwise
noted.
Torque Measurement
SECTION 4
ELECTRICAL ADJUSTMENTS
DECK SECTION | | 0dB=0.775V
1,
Demagnetize
the
record/playback
head
with
a
head
demagnetizer.
(Do
not
bring
the
head
demagnetizer
close
to
the
erase
head.)
Do
not
use
a
magnetized
screwdriver
for
the
adjustments.
3.
After
the
adjustments,
apply
suitable
locking
compound
to
the
parts
adjusted.
4,
The
adjustments
should
be
performed
with
the
rated
power
supply
voltage
unless
otherwise
noted.
5.
The
adjustments
should
be
performed
in
the
order
given
in
this
service
manual.
(As
a
general
rule,
playback
circuit
adjustment
should
be
completed
before
perform-
ing
recording
circuit
adjustment.)
6. The adjustments should be performed for both L-CH and
R-CH.
Oy
Switches
and
controls
should
be
set
as
follows
unless
otherwise
specified.
TAPE
SELECT
switch:
TYPE
I
DOLBY
NR
switch
: OFF
a
Record/Playback Head Azimuth Adjustment
Note: Perform this adjustments for both decks.
Procedure :
1. Mode: Playback
test tape
P-4-A100
(10kHz, —10dB) oscilloscope

2.
Turn
the
adjustment
screw
and
check
output
peaks.
If
the
peaks
do
not
match
for
L-CH
and
R-CH,
turn
the
adjustment
screw
so
that
outputs
match
within
2
dB
of
peak.
within
2dB ! F
output
level rn
— screw position
L-CH R-CH
peak peak
in
phase
45°
90°
135° 180°
oe
good
wrong
3.
After
the
adjustments,
apply
suitable
locking
compound
to
the
parts
adjusted.
Adjustment Location :
Adjustment screws
REC/PB head (deck B)
or PB head (deck A)
Tape
Speed
Adjustment
|
DECK
A
||
DECK
B
Procedure :
Mode: Playback
test tape
pai
“oda
frequency
counter
=k
—F
\
ac
CN911 (Pin@: L-CH)
(Pin@: R-CH)
High
speed
adjustment
(HCD-A195/G2000
only)
(Must
be
first
Adjustment deck B)
1.
Short
pin
CN912
on
set
“DUBBING
SPEED”
switch
to
“HIGH”.
Then
at
HIGH
speed
mode.
2.
Adjust
RV901
so
that
the
frequency
counter
reads
6,000+
20Hz.
Normal speed adjustment
1.
Remove
the
short
pin
from
CN912
on
set
“DUBBING
SPEED”
switch
to
“NORMAL”.
Then
at
NORMAL
speed
mode.
2.
Adjust
RV902
so
that
the
frequency
counter
reads
3,000+
10Hz.
Frequency
difference
between
deck
A
and
deck
B
the
begin-
ning
of
the
tape
should
be
within
+1%.
Adjustment
Location
:
main
TC
board
Playback Level Adjustment
Procedure :
Mode: Playback
test tape
P-4-L300
VTvVM
(315Hz, OdB) Pin@: LCH)
(Pin@: L
(Pin@: R-CH) Cry
Of
=
re
—_—
rary
CN911
Deck A side RV701 (L-CH), RV801 (R-CH)
Deck B side RV702 (L-CH), RV802 (R-CH)
so that the limits below are satisfied.
Adjustable limits :
CN911
PB
level:
366.7
to
411.4mV
(—6.5
to
—5.5dB)
level
difference
between
the
channels:
within
+1dB
Adjustment Location: main TC board
Record
Bias
Current
Adjustment
Procedure :
1. Mode: record
AF
OSC
blank
tape:
CS-123
5 attenuator
O
sfooog
i
l=}
7
6000
CN902 (Pin@: L-CH)
(Pin@: R-CH)
1)
315Hz
V
(—27.5dB
2)
10kHz
32.7mV
(
»)
2. Mode: Playback
recorded
portion VTVM
—_
7
CN911 (Pin@: L-CH)
(Pin@: R-CH)

Confirm
playback
the
signal
recorded
in
step1
become
adjustable
limits
as
follows.
If
these
levels
do
not
adjustable
limits,
adjustment
the
RV704
(L-CH)
and
RV804
(R-CH)
to
repeat
step
1
and
2.
Adjustable
limits:
Playback
output
of
315Hz
to
playback
output
of
10kHz:
0+0.5dB
Adjustment
Location
;
main
TC
board
Record Level Adjustment
Setting :
TAPE SELECT switch: TYPE I
Procedure :
1. Mode: record
AF OSC
blank tape
CS-123
5 attenuator
o— o
sfeoott LIC
6000 /
CN902 (Pin@: L-CH)
(Pin@®: R-CH)
315Hz, 32.7mV (—27.5dB)
2. Mode: playback
recorded
portion
VTVM
(Pin@: L-Ch)
oe
CN911
Confirm
playback
the
signal
recorded
in
step
1
become
adjustable
limits
as
follows.
If
these
levels
do
not
adjustable
limits,
adjustment
the
RV703
(L-CH)
and
RV803
(R-CH)
to
repeat
step
1
and
2.
Adjustable limits :
CN911
PB
level:
30.9
to
34.6mV
(—28
to
—27dB)
Adjustment
Location
:
main
TC
board
Adjustment
Location:
main
TC
board
(component
side)
PLAYBACK PLAYBACK
LEVEL LEVEL
TAPE ADJ ADJ
SPEED ADJ (DECK B) (DECK A)
eng
—————_,,
OOF
(NORMAL
)
(HIGH)
(L-CH)
(R-CH)
(L-CH)
(R-CH)
RV902 RV3901(A195/G2000) RV702 RV802 RV701 RV80}
RV804_ RV704 RV803 RV703
(R-CH) (L-CH) (R-CH) (L-CH)
—_.—_~ —_,—_—_
RECORD RECORD
BLAS LEVEL
CURRENT ADJ
ADJ

[ TUNER SECTION | | OdB=1,V |
e FM SECTION
Setting :
FM RF signal
generator
750, coaxial
FM ANTENNA teminal
Carrier frequency : 98MHz
Modulation
:
1kHz,
75kHz
deviation
FM Tuned Level Adjustment
Band: FM
Procedure :
1.
Supply
a
17.84V
(25dBuz)
98MHz
signal
from
the
ANTENNA
terminal.
2. Tune the set to 983MHz.
3.
Adjust
RV2
so
that
the
TUNED
indicator
goes
on.
Adjustment Location : main board
e AM SECTION
Setting : loop antenna B
loop antenna A (J
AM RF signal
generator
30% amplitude
modulation by 400Hz signal
AM Tuned Level Adjustment
Band: AM
Procedure :
1.
Set
loop
antenna
A
so
that
the
loop
antenna
B
input
level becomes 0.56mV (55dBy).
2. Tune the set to 1,050kHz.
Adjust
RV1
so
that
the
TUNED
indicator
goes
on.
Adjustment
Location
:
main
board
Adjustment Location: main board (component side)
AM TUNED
LEVEL
ADJ
RV1
@
RV2
FM TUNED
LEVEL
ADJ

CD SECTION
Note:
1.
CD
Block
basically
constructed
to
operate
without
adjustment.
Therefore,
check
each
item
in
order
given.
2.
Use
YEDS-18
disc
(3-702-101-01)
unless
otherwise
indicat-
ed.
3.
Use
the
oscilloscope
with
more
than
10MQ
impedance.
4,
Clean
an
objective
lens
by
an
applicator
with
neutral
detergent
when
the
signal
level
is
low
than
specified
value
with
the
following
checks.
S-Curve Check
oscilloscope
BD board
——
TP (FE)
Tee) °° Ft
ow———0 —
Procedure :
1.
Connect
oscilloscope
to
test
point
TP
(FE)
on
BD
board.
2.
Connect
between
test
point
TP
(FEI)
and
TP
(VC)
by
lead
wire.
3. Turned Power switch on.
4.
Put
disc
(YEDS-18)
in
the
turned
Power
switch
on
again
and
actuate
the
focus
search.
(Actuate
the
focus
search
when
disc
table
is
moving
in
and
out.)
5.
Check
the
oscilloscope
waveform
(S-curve)
is
symmetri-
cal
between
A
and
B.
And
confirm
peak
to
peak
level
within
3+1Vp-p.
S-curve waveform
symmetry
within 3£1Vp-p
6.
After
check,
remove
the
lead
wire
connected
in
step
2.
Note:
©
Try
to
measure
several
times
to
make
sure
that
the
ratio
of
A:
B
or
B:
A
is
more
than
10:
7.
¢
Take
sweep
time
as
long
as
possible
and
light
up
the
brightness
to
obtain
best
waveform.
RF Level Check
oscilloscope
BD board
——— aN,
TP (RFO) O«——o +
TP (VC) gw ——Lo —
Procedure :
1.
Connect
oscilloscope
to
test
point
TP
(RFO)
on
BD
board.
. Turned Power switch on.
3.
Put
disc
(YEDS-18)
in
and
playback.
4.
Confirm
that
oscilloscope
waveform
is
clear
and
check
RF signal level is correct or not.
Note:
Clear
RF
signal
waveform
means
that
the
shape
“©”
can
be
clearly
distinguished
at
the
center
of
the
waveform. ,
VOLT/DIV: 200mV
RF signal waveform TIME/DIV: 500nS
W
Vi
WAAAY
FR
RH
level: 1.2 +828 Vp-p
SAA
E-F Balance Check
oscilloscope
BD board
pa EES
TP (TE) gg! ¥
TP (VC) |
Procedure :
1.
Connect
test
point
TP
(ADJ)
to
ground
and
TP
(TED)
to
TP
(VC)
with
lead
wire.
;
Connect
oscilloscope
to
test
point
TP
(TE)
on
BD
board.
Turned
Power
switch
on.
Put disc (YEDS-18) is and playback.
Confirm
that
the
oscilloscope
waveform
is
symmetrical
on
the
top
and
bottom
in
relation
to
0V,
and
check
this
level.
PF wp
Traverse waveform
level: 2+1Vp-p
6.
Remove
the
lead
wire
connected
in
step
1.

RF PLL Free-run Frequency Check
Procedure :
1.
Connect
frequency
counter
to
test
point
(PLCK)
with
lead
wire.
frequency counter
BD board
———=+
TP (PLCK) pores mer oe
:
2. Turned Power switch on.
3. Confirm that reading on frequency counter is
4,3218MHz.
Adjustment Location :
{BD BOARD)
—Side B—
(CD MAIN BOARD)
—Component side—

SECTION 5
DIAGRAM
5-1.
CIRCUIT
BOARDS
LOCATION
POWER board POWER AMPLIFIER board
MAIN board
PANEL board
LEAF SW (A) board
MAIN TC board
LEAF SW (B) board
LOADING MOTOR board
OPEN/UP
SW
board
SW
board
hag abi aetig a inc ae aaa ace a Weel le nag gs etn pkey ek da legs Se hus be tae

6-3. BLOCK DIAGRAM
— TUNER SECTION (AEP, German, Italian model) —
+10V
Q5
TM1
COAXIAL =”
aa }.
aM 1 Q
l
° FE1
FM FRONT END
© ANT | MPX IN OUT L@Q}->|LPF1}-—-(8)AMP INL L(6-=3
| om
FM/AM MPX
IC3
*R CH: Same as L CH
(wy) yo L CH "SIGNAL PATH
MW/LW |VT STEREO <1: FM
y 1 TUNED
ee -mw
oO
e <S:Lw-
9
Oo
>
C3) 450kHz 456kKHz
MUTING | ain
SECTION
(Page 29)
LATCH
-DT. OUT
CLK
DT IN