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Hitachi CMT2979 User manual

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C
ns
(
CAUTION:
June
1996
7
SERVICE
MANUAL
SE:
FORE
ALUULASLIA,
BEA
RUS
Be
Ke
RS
LAER
AT,
Before
servicing
this
chassis,
it
is
important
that
the
service
technician
reads
the
“Safety
IAM
EL
IT
BARREL
GH
Precaution”
and
“Product
Safety
Notices”
in
this
Service
Manual.
HR
AK
AO
TUG
BE
occ
ceseeneresessessseseserennens
4
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EA
A
Ee
EE
RTI
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ecessesssseesenssvssens
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eae
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AUTRE
STA
AGE
cocccsscesccsseessesvcsvessesseesescssesessenteess
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ean
res
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eas
elas
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eat
abies
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SPIT
BETA
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ROU
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ae
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tus
feteca
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AAS
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cutee
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EE
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VAIS
oes
ssesss
estes
sssssonesssenssssossssvessenses
Ae
HR
Sait
scrnonosant
asoatbarnvedtere
tararaanineirie:
COLOR
TELEVISION
CONTENTS
SAFELY
PREGAUTIONS
si
dussssrivensestssruccarssiaeouaass
2
PRODUCT.
SAFELY
NOTICES
scccassscsssnivveinnnrsratsnaize
2
Se
ECIFICATIOINS
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sfetaze
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6
CONTROLS
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sadn
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7
REMOTE
CONTROL
UNIT.
:csssnsssoniscssutvaressousssarivenrts
8
ODI
PIN
DESCRIPTIONS
ssssscnstnttcsssitasasiate
sonasndisieens
9
IZOLAIN-DESCRIPTIONS
issicsiscnsniaperniecnasieneieess
10
PLP
SADJUS
[MENT
cs.cpieariiaicdunnnannacnn
1]
VC.OU-ADJUSTMENT
ssssvessenttnss
ittiaiatisxtenadcdeeisaiies
12
AGC
ADJUSTMENT
cccssicscocsocneussistessansssisanianessenaes
13
HORIZONTAL
CENTER
POSITION
ADJUSTMENT....13
VERTICAL
AMPLITUDE
ADJUSTMENT
....ssssseesees
14
ADJUSTMENT:
POINTS
sisssicssesssssorsatisessinncrsessnssonsiee
14
WIRING
DIAGRAM
cis
sscssssnstsaspanecssntmanataiosusnansensdenvs
15
WAVEFORMS
sissdeseitovosiiesiataotuanaiaaiiesed
corks
16
BASIC
CIRCUIT
DIAGRAM
.....sessesesseeees
18,19,21,22
PRINTED:WIRING
BOARD
cisssastssniasesissisevceaveenienss
19
REPLACEMENT
PARTS
LIST
-csiesssssnscsreanaeess
23-36
HITACHI
CONSUMER
PRODUCTS
(S)
cee
eccrine
ON
IZ
[¥s||_No.
o046c-E
|
192S,
041,
051,
981,
0815S,
751
as
spe
RAG
a
HRS
NE
Oh
ore
ce
aH,
Bie
elec
ait
vie
ahs
CMT2979
ee
TECHNICAL
CAUTIONS
SAFETY
PRECAUTIONS
WARNING:
Since
the
chassis
of
this
receiver
is
connected
to
one
side
of
the
Mains
Supply
during
operation,
service
should
not
be
attempted
by
anyone
unfamiliar
with
the
precautions
necessary
when
working
on
this
type
of
equipment.
The
folfowing
precautions
should
be
observed.
1.
Do
not
install,
remove,
or
handle
the
picture
tube
in
any
manner
unless
shatter-proof
goggles
are
worn.
People
not
so
equipped
should
be
kept
away
while
picture
tubes
are
handled.
Keep
picture
tube
away
from
the
body
while
handing.
.
When
replacing
chassis
in
the
cabinet,
all
the
protective
devices
are
put
back
in
place,
such
as;
barriers,
non-
metallic
knobs,
adjustment
and
compartment
cover
or
shields,
isolation
resistors-capacitors,
etc..
3.
When
service
is
required,
observe
the
original
lead
dress,
Extra
care
should
be
taken
to
assure
correct
lead
dress
in
the
high
voltage
circuitry
area.
.
Always
use
the
manufacturer's
replacement
component.
Especially
critical
components
as
indicated
on
the
circuit
diagram
should
not
be
replaced
by
other
makes.
Furthermore
where.a
short
circuit
has
occurred,
replace
those
components
that
indicate
evidence
of
overheating.
5,
Before
returning
a
serviced
receiver
to
the
customer,
the
service
technician
must
thoroughtly
test
the
unit
to
be
certain
that
it
is
completely
safe
to
operate
without
danger
of
electrical
shock,
and
be
sure
that
no
protective
device
built
into
the
instrument
by
the
manufacturer
has
became
defective,
or
inadvertenly
defeated
during
servicing.
Therefore,
the
following
checks
are
recommended
for
the
continued
protection
of
the
customers
and
service
technicians,
INSULATION
Insulation
resistance
between
the
mains
poles
and
any
accessible
metal
parts
should
not
be
less
than
7MQ
at
500V
DC.
Also,
no
flashover
or
breakdown
should
occur
during
the
dielectric
strength
test,
to
apply
4KV
AC
for
one
minute
between
the
mains
poles
and
any
accessible
metal
parts.
bo
>
X-RADIATION
TUBES:
Tie
primary
source
of
X
radiation
in
this
receiver
is
the
picture
tube.
The
tube
utilized
in
this
chassis
is
specially
constructed
to
limit
X
radiation,
For
continued
X
radiation
protection,
the
replacement
tube
must
be
the
same
type
as
the
original,
HITACHI
approved
type.
High
Voltage
This
receiver
is
provided
with
a
hold
down
circuit
for
clearly
indicating
that
voltage
has
increased
in
excess
of
a
predetermined
value,
Comply
with
al!
notes
described
in
this
Service
Manual
regarding
this
hold
down
circuit
when
servicing,
so
that
this
hold
down
circuit
is
operated
correctly.
Serviceman
Warning
With
minimum
Black
Level
and
Picture,
the
operating
high
voltage
in
this
receiver
is
lower
than
31.0K.
In
case
any
component
having
influence
on
the
high
voltage
is
replaced,
confirm
that
high
voltage
with
minimum
Brightness
and
contrast
is
lower
than
33.0kV.
To
measure
H.
V.
use
a
high
impedance
H.
V.,
meter.
Connect
(-)
to
chassis
earth
and
(+)
to
the
CRT
anode
.
button.
(See
the
following
connection
diagram).
NOTE:
Turn
the
power
switch
off
without
fail
before
the
connection
to
the
Anode
button
is
made,
CRT
ANODE
HIGH
IMPEDANCE
H.V,
METER
CHASSIS
GROUND
PRODUCT
SAFETY
NOTICE
Many
electrical
and
mechanica!
parts
in
HITACHI
television
receiver
have
special
safety
related
characteristics.
These
characteristics
are
often
not
evident
from
visual
inspection
nor
can
be
protection
afforded
by
them
necessarily
be
obtained
by
using
replacement
components
rated
for
higher
vol
tage,
wattage,
etc.
Replacement
parts
which
have
these
specia!
safety
characteristics
are
identified
in
this
Service
Manual.
Electrical
components
having
such
features
are
identified
by
marking
with
a
A
mark
in
the
schematics
and
on
the
replacement
parts
list
in
this
Service
Manual.
The
use
of
a
substitute
replacement.
component.
which
does
not
have
the
same
safety
characteristics
as
the
HITACHI
recommended
replacement
one
shown
in
the
parts
list
in
this
Service
Manual,
may
create
electrical
shock,
fire,
X
radiation,
or
other
hazards.
Product
Safety
is
continuously
under
review
and
new
instrictions
are
issued
from
time
to
time.
For
the
latest
information,
al’
ays
consult
the
current
HITACHT
Service
Manual.
A
subscription
to,
or
additional
copies
of,
HITACHI
Service
Manual
may
be
obtained
at
a
nomina!
charge
from
your
HITACHI
sales
offices,
.
D4
iJ
Rosset.
CMT2979
TECHNICAL
CAUTIONS
High
voltage
limiter
circuit
operation
check
1,
Connect
the
high
voltage
voltmeter
between
the CPT
anode
(anode
cap)
and GND
(CPT
grounding
Jead).
2,
Receive
the
broadcast
signal
and
set
the
brightness
and
contrast
VRs
to
max.
Set
the
beam
current
to
1.5mA+10%..
(After
cut-off
adjustment)
3,
Set
the
AC
input
voltage
to
220-43V,
4,
Check
that
the
constant
high
voltage
is
28,0
+1.0kV
at
this
time.
5,
Turn
the
switch
of
the
set
to
off
and
connect
the
jig
shown
in
Fig.3
at
both ends
of
R956
as
shown
in
Fig.
1.
6.
With
the
brightness
and
contrast
VRs
left
as
set
in
item
2
and
with
the
AC
input
voltage
stabilized
at
220V,
turn
the
picture
disappears
with
a
high
voltage
of
32.5kV
or
less.
7.
Turn
the
switch
of
the
set
to
off
immediately
after
the
check
is
completed.
8.
Remove
the
adjust
jigs
and
high
voltage
voltmeter,
NOTE
:
When
connecting
disconnecting
the
high
voltage
volt-
meter
to
from
the
anode
cap,
be
sure
to
turn
the
switch
of
the
set
off and
do
it
after
the
residual
high
voltage
is
discharged
to
the
chassis
because
the
high
voltage
may
remain
at
the
anode
cap.
CPT
Anode
CPT
Earth
Wire
Fig.
2
D.C
Voltage
Divide
15K
Q
5OKQ-B
Digital
Voltmeter
Fig.
3
CMT2979
|
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CMT2979
:
|
CMT2979
SPECIFICATIONS
1
CONTROLS
5-H
7
:
P
i
i
a
625-lines
ah
eae
Antenna
input
75
1
COAXIAL
IEC
TYPE
(
ANS
)
Tene
751:
A68AEG25X
Pan
,
NTSC5O
Color
picture
tube
;
ced:
Fs
Reception
system
525-lines
M/NTSC
SE
pe
Niet
Others
:
AG8KSA30X/AG8AEG25X
gob
AL
NTSC3,58-5.5/6,0/6.5
Speaker
JOomax2
7
NTSC4,43-5.5/6,0/6.5
PAL
60
Sound
output
7Wx2
[
081S
:;
AC
200~240V
50/60Hz
041
=:
AC
200/220V.
=
S0Hz
751
=:
AC
240V
50Hz
Power
supply
191
:
A
127V
50/60Hz
(Usable
Range:
100V~280V)
Others
:
AC
110~240V
50/60Hz
(Usable
Range:
100V~280V)
CCIR_
:
E2~12,
E21~69,
S01~3,
$1~10,
$11~20,
$21~41
OIRT.
:
Ri~12,
R21~69
(re
re
JAPAN
:
J1~12,
J13~62
Frequency
range
U.S.A.
:
US2~13,
J~W,
US14~69
Power
consumption
ee
:
anes
eM)
44MHz~863MHz
Hong
Kong,
U.K.
:
UK21~69
Weight
(kg)
40
eee
Te
2
Dimensions
China
:
C1~12,
C13~57
WxHXD
(em)
67.9X56.6X48.4
POWER
ON/OFF
SWITCH
BFK
POWER
STANDBY
INDICATOR
A/S
IT
TIMER
INDICATOR
3
|
aemtagaRty
FE
i
FRSC
REMOTE
CONTROL
RECEIVER
S|
ides
Healy
2p
g
|
INPUT
3
INPUT
TERMINAL
Specifications
are
subject
to
change
without
notice
to
improve
performance.
RRS
TSE
AIMECHD
ij
Sth:
A68KSA30X/A68AEG25X
.
fonhculi
025i
B.G/V/D.K/H
PAL
f
-
|
|
HEADPHONE
JACK
NISD
jth
ORK)
7x2
ee
tab
I
3k
5254
M/NTSC
081S:
39200
~
240
50/60FIz
INPUT
SELECT
NTSC3.58~5,5/6.0/6.5
041:
3Ei#,200/220V
SOHz
8
|
fi
A
tet
NTSC4.43-5.5/6.0/6.5
751:
38Hi240V
SOHz
PAL60
191:
48#£127V.
50/60Hz
(ii
JASE
EE:
100V
~
280V)
HUB:
BEHE110
~
240V
50/60Hz
{ii
FALE
EE|:100V
~
280V)
VOLUME
UP/DOWN
9
|
EHS
/
Me
;
PROGRAMME
UP/DOWN
tst—~<CtstCS~™S
:
|
10
|
Ari
ARIAL
TERMINAL
CCIR
:E2~12,
E21~69,
Sol~3
|
MARE
041:
87
(ECW
13570)
“
ae
,
S1~10,
S11~20,
S21~41
Je(lb:
40K,
Sp
-—
Be
iP)
ewe
wattle
OIRT
:R1~12,
R21
~69
Le
ie
KET
en
BS
ar
re
AV
IN/OUT
TERMINALS
4426
~
86336%
=|
SIRT:
US2~13,
J-W,
USI4~69
|
gi
pest
(BLK)
67.9%
56.6%
48.4
12
|
AV
Si)
A$
LL
a
fii,
JS:
UK21~
69
ae
HpiR):
Cl~12,
C13
~$7
(58%
ih
x
HE)
KR
S
EAT
LA
RI,
MR
ATE,
'
(MT2979
:
_owrz979
|
REMOTE
CONTROL
UNIT
CMT2979
(EAH
L
ISH
E
)
POWER
ON/OFF
PIN
DESCRIPTIONS
OF
[001
(M37221M6-065SP)
1)
igsr/®
|
9
ad
mic
PIN
NO.
;
DESCRIPTION
mp
OE
i
A]
;
;
3
Al
ws
|
al
This
is
the
horizontal
synchronous
signal
input
pin
for
On-screen
display.
r
FEL
Ee
ill
,
in
a
:
ee
ee
a
put
This
is
the
vertical
synchornous
signal
input
pin
for
On-screen
display,
{
|
2
|
INPUT
SELECTION
:
mae
lea
——-
~
POWER
Ay
be
A
EHR
3
TV/S/VIDEO
Output
Selection
of
“TV”
or
“S-VIDEO
in”
or
“VIDEO
in”
signal,
H:
TV
M:
S-VIDEO
L:
VIDEO
REGALL
TVVIDEO
5
tae
SELECTOR
:
ee
Bright
Output
Output
of
the
different
DC
levels
to
control
each
function.
Bs
eure
i
[4
|
g
EROGRAINE
DOWN
7
Output
|
e.g,
COLOR
UP/DOWN,
BRIGHT
UP/DOWN
etc...
a
@
@!
—
|
ee
ee
7)
WEI
_
|
in
utpu
©
a
THEE
_
a
thy
ah
!
;
f
7 .
GAME
|
9
|
4.5
tow
|
Output
|
Contro!
Output
for
SAW
fiter,
L:
4.5tMhz,
H:
Other
EK
R/C
Remote
con.
serial
data
input
from
R/C
receiving
unit
(X0O1)
@
(8)
10
cH
Ve
Oren
aa
1]
Power
Output
Power
on/off
contol.
H:
On,
L:
Stand
by
S
(¥)
TV/TEXT
(Fig
JIF-081S
45
PX-981
1
)
12
Output
for
front
control
matrix
to
control
vol.,
programme.
y
ee
cy
13
Return]
Input
Return
of
front
control
matrix
|
SURROUND
(not
operation
even
if
it
is
pressed).
—
:
a
p
.
(1)
(2%)
Ll
|
spe
(ARYL
AONE)
aa
Return
of
front
control
matrix.
a
as
15
Return3
Input
Return
of
front
control
matrix,
e
4
El
16
Scanl
Output
Output
for
front
contro!
matrix
to
control
vol.,
programme.
RE
in
MUTE
NOISE
REDUCTION
15
|
ai
ysizpe
sae
area
Beep
Output
Beep
sound
output,
L:
Off,
Beep:
irin
50%
Duty
Cycle
4
MHZ
Clock
In
4
MHZ
Clock
Out
_
2.
—_
=
lela)
Jel
16)
rite
2
af
aN
=
[15]
18
ae
23
S-DET
Input
To
identify
the
voltage
of
S-VIDEO
signal.
MENU
Sync-ldent
Input
A/D
terminal
served
to
detect
the
present
of
H
sync
signal.
y
25
Reset
Input
Resets
1004
initiated
by
Power
(Pin
11)
z
Dee
en
eee
oe
iM
Output
|
Selects
the
sound
system
4.5MHZ
5.5MHZ
6.0MHZ
6,5MHZ
[17]
|
v
VIR
OPERATING
REVS
BG/DK
Output
MoH
H
L
L
|
21)
REHLGINA
GNF
IOUS)
BG.DK
H
L
H
L
CH
I/CH
Il
a
Input
Color
identification
of
PAL
DECAM
or
NTSC
Sess
AFC
Input
AFS
voltage
input.
After
A/D
conversion,
this
pin
also
serve
to
detect
the
present
of
RF
signal
Dimmer
Input
A/D
terminal
served
to
detect
the
present
of
Q004
SW
Output
|
NC
SDAI
In/Out
|
IC
data
select
50/60
Force
|
Output
|
Ident
by
pin
2
and
controls
output
from
this
pin.
L:
60HZ,
H:
50HZ
34
SCLI
lIC
clock
select
35
ON/OFF
Mute
Output
Mute
control
output
36
S-Low
SVIDEO
contro!
output
37
SDA2
In/Out
IIC
data
select
{for
EEPROM)
38
SCL2
Output
|
IIC
clock
select
(for
EEPROM)
OSD-Bik
Output
On-Screen-Display
blankig
output
|
Output
|
Blue
output
for
On-Screen-Display
Output
Green
output
for
On-Screen-Display
Output
Red
output
for
On-Screen-Display
39
a
—
>
ro
|
Vv
|
0B1S
&
:
OTHERS
PX-981
ONLY
i
CMT2979
CMT2979
PIN
DESCRIPTION
FOR
1201
-
TDA
8362
P.
|.
F.
Carrier
Filter
Adjustment
(P.
|.
F.
i232)
pan
cape
rt
NO
ARTS
RE
EAE
AM
INST
me
fel
>
Wir
COym~)
OV
Slo}
Tr
Decoupling
digital
supply
Ground
10
Positive
supply
(8V)
Ground
Decoupling
filter
tuning
Internal
CVBS
input
GENERATOR
>
FP=38,
SMHz
opqop
mz
802
}
BS
|
4.3
SIGNAL
LEVEL:
~10~QdBm
DESCRIPTION
F
: 7
rks/Waveform
Audio
deemphasis
and
+/~
mod.
switch
|
Audio
output
ol
nonvolume
controlled
and
fave
lo
be
bullered.
:
Preparations
for
Adjustment
Adjustment
Procedure
IFcemodulator
tuned
circuit
SAC
BAN
MEE
oF
SSH
AMER
NAY
=
(1)
|
Apply
the
following
signal
across
IF
(1)
|
Adjust
L202
until
a
“Fast
rate
of
IF-demodulator
tuned
circuit
out
and
GND
of
tuner,
charge”
is
seen
on
voltmeter.
Video
identification
output
~
N.C.
‘
Then
adjust
L202
to
obtain
reading
on
Sound
IF in
plus
volume
control
i
veltmeter
as
below.
—
>
:
VIDEO
SIGNAL
External
audio
intput
-
N.C.
GENERATOR
Video
output
ie
FP
SIGNAL
y
Sars
Derived
from
internal
RF
video
output
(Pin
7)
and
supplied
to
the
synchronization,
luminance
and
chrominance
processing
(level
=
2Vpk-pk)
by
selection.
Peaking
control
input
15
External
CVBS
input
Derived
from
external
video
source
and
supplied
to
the
synchronization,
luminance
and
chrominance
processing
f
(level
=
LVpkpk)
by
selection.
SIGNAL
LEVEL:
PHILIPS
PATERN
0
FP
16
Chroma
+
A/V
switch
input
DC
voltage
control
the
selection
of
internal/external
CVBS
(Pin
13
or
15)
and
audio,
: .
,
ie.
<0.5V
:
Internal
signals
(2)
|
Connect
the
oscilloscope
to
the
pin
44)
V
=
4:3+0.2V
>7.5V
:
External
signals
of
1201
7
Brightness
contro!
input
18
B-output
19
G-output
20
R-output
21
RGB-insertion
and
blanking
input
2
R-input
for
insertion
NO
ine)
w
G-input
for
insertion
B-input
for
insertion
Contrast
control
input
Saturation
cou.
ee
tg
ee
ee
27
Hue
contro!
input
Color
decoder
selection
between
NTSC
or
PAL/SECAM.
ie,
O~5Y
:
NTSC
decoder
activated
>6V_
:
PAL/SECAM
decoder
applied
no
>
nN
won
nh
ao
B-Y
input
signal
29
R-Y
input
signal
R-Y
output
signal
BY
output
signal
SECAM
Reference/Communication
Loop
filter
burst
phase
detector
3,58
MHz
X-tal
connection
4,43
MHz
X-tal
connection
Start
horizontal
oscillator
Start
supply
pin.
If
the
start
voltage
is
below
5.8V,
the
horizontal
output
will
be
disabled,
(Normal
—
7,2V~8.8V)
w
Oo
GW}
Wi
Go
WERT
w
>
w
an
Wiw
Wiw
oymi
o
Horizontal
output
Flyback
input/sandcastle
output
%-2
loop
filter
ive}
>
Oo
-1
loop
filter
41
Vertical
feedback
input
Vertical
ramp
generator
Generates
a
linear
sawtooth
output
for
the
vertical
output
stage.
43
Vertical
drive
output
This
pin
is
the
current
output
of
the
vertical
preamplifier
and
drives
the
vertical
deflection
stage.
The
amplifier
has
a
feedback
output,
Pin
41,
in
order
to
sense
the
current
in
the
vertical
D.Y.
AFC
output
5
IF-input
IF
input
from
Tuner
and
Saw
Filter,
>
>
=>
a
hr
> ~
Tuner
AGC
output
Voltage
to
change
the
Tuner
gain
when
RF
input
signal
amplitude
becoems
too
strong.
AGC
decoupling
capacitor
The
Tuner
AGC
control
takes
over
when
IF
input
reaches
a
certain
input
level,
the
take
over
point
is
adjusted
af
this
point,
=
fee)
Tuner
take-over
adjustment
Audio
output
Decoupling
sound
demodulator
Decoupling
bandgap
supply
on
ise)
=
-10-
-li-
CMT2979
VCO
Adjusment
(For
0818,
751,
051
&
PX-981
Only)
VCO
ia
Preparations
for
Adjustment
(1)
Connect
frequency
counter
between
19
pin
of
[E01
and
GND
via
Amp
(Gain=4-dB)
19
pin
of
IEQ1
(2)
|
Put
E0113)
pin
to
GND
via
1000,
(3)
Apply
9V
to
EL14.
(Another
Method)
(1)
Connect
spectrumanalyzer
between
19
pin
of
IEOL
and
GND.
Spectru.
19
pin
of
IEO1
Analyzer.
(2)
Put
SG
(38.9MHz+5kHz
without
modulation}
signal
to
GND.
And
increase
output
level
till
spectrum
analyzer
detect
that
level.
19
pin
of
IEO1
fe
(3)
Connects
IEO1
pin
3
to
GND
via
1000,
SG
(38.9MHz+5kHz)
(4)
Apply
9V
to
LE14,
Adjustment
Procedure
Remarks/Waveform
Amp.
should
be
amplify
only
38.9MHz,
To
prevent
VCO
frequency
drift,
make
heat
run
more
than
10
minutes
before
adjustment.
Adjust
LEQ2
as
frequency
counter
shows
38.9MHz+300kHz
Adjust
LEO2
til
the
frequency
difference
between
VCO
and
SG
signal
within
+
300kHz.
~12-
Fe
Sal
mea
Ree
LALA
Ye
te
an
gee
NT
LD
RET
ESET
ewes
neeund
ee
AGC
ADJUSTMENT
(AGC
i)
Preparations
for
Adjustment
.
Adjustment
Procedure
Received
following
channel
and
strength.
(1)
With
the
signai
received,
apply
heat
run
for
more
than
two
minutes
to
avoid
the
influence
of
circuit
temperature
drift.
(2)
Connect
the
voltmeter
of
at
least
1002
internal
impedance
to
the
AGC
terminal
of
the
tuner.
(1)
CHANNEL
STRENGTH
:
-47dBm
CMT2979
Remarks/Waveform
CCIR
5
Adjust
R222
until
the
following
voltage
is
reached,
V1+0,5v+0,2v)
V1:
the
voltage
without
signal
HORIZONTAL
CENTER
POSITION
ADJUSTMENT
(7k-F
(teva)
Preparations
for
Adjustment
Receive
the
circle
pattern
signal.
(2)
Set
the
brightness
and
contrast
VRs
to
maximum.
Adjustment
Procedure
Remarks/Waveform
Picture
information
amount
The
amount
of
information
means
the
amount
of
the
transmitted
picture
that
can
be
displayed
on
the
CPT
screen.
It
is
necessary
to
increase
this
amount
of
information
as
much
as
possible
and
also
decrease
the
lack
of
raster
as
far
as
possible.
Turn
R702
(H.
Phase)
and
adjust
so
that size
scales
on
the
left
and
right
are
equal.
within
1.5~2
(recommended
scale)
Size
scale
-13-
CMT2979
CMT2979
VERTICAL
AMPLITUDE
ADJUSTMENT
(2H
(2
515%)
WIRING
DIAGRAM
Preparations
for
Adjustment
Adjustment
Procedure
Remarks/Waveform
tin
(
ie
3
4
re
cea
ee
Start
adjustment
5
minutes
or
more
Select
V.
CENT
select
chip
"U”,
“N"
ad
y
after
the
power
switch
is
turned
on.
and
“D"
so
that
the
center
of
the
|
picture
is
closest
to
the
geometrical
Receive
the
PAL
circle
pattern
signal.
center
of
the
CPT.
Set
the
brightness
and
contrast
VRs
Adjust
R620
to
obtain
the
following
to
maximum.
conditions.
|
Place
the
set
facing
north
or
south,
Receive
the
NTSC.circle
pattern
signal
and
check
that
the
picture
is
the
same
as
that
when
a
PAL
signal
is
received.
Top
shrinked,
Standard
Top
expanded,
,
bottom
expanded
condition
bottom
shrinked
|
Picture
condition
sao
i
i}
()
,
|
oe
|
Adjustment
Center
of
inner
and
outer
circles
Center
of
inner
circle
|
method
Picture
bottom
Inner
circle
Center
of
inner
and
outer
circles
|
ADJUSTMENT
POINT
(8822
(iz)
s
ae
Elo
WE
|
MAKE
2
:
MO
TALL
wi
|
Me
LEO2
L202
TO
AVOID
TUNER
|
=31;
TOUCHING
BETWE
ps
}
oo,
12
HATS
7
f
E108
18
me
:
j
DIRECTION
SHOWN
R222
f
FOCUS
ADJ.
SCREEN
ADJ.
2%
Be
ih
T/TEXT
P.W.B.
(AFA¥F081S-5PX-981)
T/Text
P.W.B.
(for
081S,
PX-981
only)
wad,
-15-
CMT2979
WAVEFORMS
(6)
1201
(5
pin
1001
PIN_NO.
VOLTAGE
PIN_NO.
Liz}
is
|
19
|
a
fai]
a
2
[5.2
[52
|
ac
[0
|
p23 123
97
@)
1201
@
201
©
pin
@
pin
34
36
et
38
fag
ao
fa
fae
i.
Sy
Drotince
a
a
[ee
po2rt
of oy
oy
ak
av)
ard
wae
1002
aim
ioe,
a)
ee
eo
[vourace
“oot
oo
|
sep
se
[oper]
1004
2.
-
p
1,
3Vp-p
[enna
|
33)
lEO1
Pi
NO.
i
Beart
C7[
se
sToln]
elusive]
a]
VOLTAGE
15.7]
74
|
meets
oe
ees
is
a
a
ee
ee
ee
ae
ee
FIN
NO.
pane
Patent
eee}
IEO2
Tenn.
[1]
7.3
[vourace
a
so
a3
1EO3
K—
1H
—>|
k-———
1H
——_
1201
@9
pin
de
Parana
aa
a
14
15
6
17
4.1
4
4.1
4.
(6)
1901
@:V-DY
TOLTAGE
Pa
hee
s+
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