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JVC AV-27920 User manual

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JVC
CONTENTS
|
|
SPECIFICATIONS
re
2
@
SAFETY
PRECAUTIONS
-*:<**2**-*22*%
Ce
ee
3
@
FEATURES
°-«--++-e
+22
e022
eee
ene
ey
4
i
|
DIFFERENCE
LIST
OF
MAIN
PARTS
i
ee
4
a
OPERATING
INSTRUCTIONS
ee
ee
ee
ee
ay
5
i]
SPECIFIC
SERVICE
INSTRUCTIONS
ee
ra
Glatelo\bidsa
ale
ake
Sierra
6
i
|
SERVICE
ADJUSTMENTS
ee
10
%
STANDARD
CIRCUIT
DIAGRAM
(APPENDED)
«+
---+++--crereeeee
reer
e
reese
ee
ee
eee
es
2-1
i]
PARTS
LIST
ee
ry
TUTE
ECELELET
TEE
er
25
F
COPYRIGHT
©
1998
VICTOR
COMPANY
OF
JAPAN,
LTD.
No.
51370
Mar.
1998
AV-27920
SPECIFICATIONS
Dimensions
(W
x
H
x
D}
Mass
TV
RF
System
Color
Sound
System
TV
Receiving
Channels
and
Frequency
VL
Band
VH
Band
UHF
Band
CATV
Receiving
Channels
and
Frequency
Low
Band
High
Band
Mid
Band
Super
Band
Hyper
Band
Ultra
Band
Sub
Mid
Band
TV/ICATV
Total
Channel
Intermediate
Frequency
Video
IF
Carrier
Sound
JF
Carrier
Color
Sub
Carrier
Power
Input
Power
Consumption
Picture
Tube
High
Voltage
Audio
Power
Output
Input
Video
Input
Audio
Input
Antenna
Terminal
Remote
Control
Unit
25-3/4"
x
23-3/8"
x
19-1/2”
/
65.4em
x
59.3cm
x
49.4cm
68.5
ibs
/
31.1
kg
CCIR(M)
(Multi
Channel
Sound)
(02~06)
54MHz~88MHz
(07~13)
174MHz~216MHz
(14~69)
470MH2~806MHz
(02~06,
A-8)
by
(02~06&01)
(07~13)
by
(07~13)
(A~1)
by
(14~22)
(J~W)
by
(23~36)
(W+1~W+28)
by
(37~64)
(W+29~W+84)
by
(65~125)
(A8,
A4~A1)
by
(01,
96~99)
180
Channels
(64MHz~804MHz)
45.75MHz
41.25MHz
(4.5MHz)
3.58MHz
120V
AC,
60Hz
113W
(US)
/1.8A
(CA)
27”
(68cm)
Measured
Diagonally
29kV+1kV
(at
zero
beam
current)
2"
x
3-1/2"
/5
x
9em
Oval
type
x
2
1.2W
x2
1Vp-p,
752
(RCA
pin
jack)
500mVrms
(
-4dBs
),
High
Impedance
(RCA
pin
jack)
Low
impedance
(400Hz
when
modulated
100%)
(RCA
pin
jack)
752
(VHF/UHF)
Terminal,
F-Type
Connector
RM-C754-1C
(AA/R6/UM-3
battery
x
2)
Design
&
specification
are
subject
to
change
without
notice.
No.51370
AV-27920
SAFETY
PRECAUTIONS
1.
The
design
of
this
product
contains
special
hardware,
many
10.
Isolation
Check
circuits
and
components
specially
for
safety
purposes.
For
continued
protection,
no
changes
should
be
made
to
the
original
design
unless
authorized
in
writing
by
the
manufacturer.
Replacement
parts
must
be
identical
to
those
used
in
the
original
circuits.
Service
should
be
performed
by
qualified
personnel
only.
(Safety
for
Electrical
Shock
Hazard)
After
re-assembling
the
product,
always
perform
an
isolation
check
on
the
exposed
metal
parts
of
the
cabinet
(antenna
terminals,
video/audio
input
and
output
terminals,
Control
knobs,
metal
cabinet,
screwheads,
earphone
jack,
control
shafts,
etc.)
to
2.
Alterations
of
the
design
or
circuitry
of
the
products
should
not
be
be
sure
the
product
is
safe
to
operate
without
danger
of
electrical
made.
Any
design
alterations
or
additions
will
void
the
shock.
manufacturer's
warranty
and
will
further
relieve
the
manufacturer
(1)
Dielectric
Strength
Test
;
!
of
responsibility
for
personal
injury.or
property
damage
resulting
The
isolation
between
the
AC
primary
circuit
and
all
metal
parts
i
therefrom.
exposed
to
the
user,
particularly
any
exposed
metal
part
having
a
i
3.
Many
electrical
and
mechanical
parts
in
the
products
have
return
path
to
the
chassis
should
withstand
a
voltage
of
1100V
i
special
safety-related
characteristics.
These
characteristics
are
AC
(r.m.s.)
for
a
period
of
one
second.
I
often
not
evident
from
visual
inspection
nor
can
the
protection
(...
.
Withstand
a
voltage
of
1100V
AC
(r.m.s.)
to
an
appliance
i
afforded
by
them
necessarily
be
obtained
by
using
replacement
rated
up
to
120V,
and
3000V
AC
(r.m.s.)
to
an
appliance
rated
i
components
rated
for
higher
voltage,
wattage,
etc.
Replacement
200V
or
more,
for
a
period
of
one
second.)
parts
which
have
these
special
safety
characteristics
are
This
method
of
test
requires
a
test
equipment
not
generally
found
i
identified
in
the
parts
list
of
Service
manual.
Electrical
in
the
service
trade.
components
having
such
features
are
identified
by
shading
(2)
Leakage
Current
Check
i
on
the
schematics
and
by
(A\)
on
the
parts
list
in
Service
Plug
the
AC
line
cord
directly
into
the
AC
outlet
(do
not
use
a
line
;
manual.
The
use
of
a
substitute
replacement
which
does
not
isolation
transformer
during
this
check.).
Using
a
“Leakage
:
have
the
same
safety
characteristics
as
the
recommended
Current
Tester",
measure
the
leakage
current
from
each
exposed
j
replacement
part
shown
in
the
parts
list
of
Service
manual
may
metal
part
of
the
cabinet,
particularly
any
exposed
metal
part
i
cause
shock,
fire,
or
other
hazards.
having
a
return
path
to
the
chassis,
to
a
known
good
earth
ground
:
4.
Use
isolation
transformer
when
hot
chassis.
(water
pipe,
etc.).
Any
leakage
current
must
not
exceed
0.5mA
(
The
chassis
and
any
sub-chassis
contained
in
some
products
are
AC
(r.m.s.).
i
connected
to
one
side
of
the
AC
power
line.
An
isolation
However,
in
tropical
area,
this
must
not
exceed
0.2mA
AC
transformer
of
adequate
capacity
should
be
inserted
between
the
(r.m.s.).
product
and
the
AC
power
supply
point
while
performing
any
@
Alternate
Check
Method
service
on
some
products
when
the
HOT
chassis
is
exposed.
Plug
the
AC
line
cord
directly
into
the
AC
outlet
(do
not
use
a
line
5.
Don't short
between
the
LIVE
side
ground
and
ISOLATED
isolation
transformer
during
this
check.).
Use
an
AC
voltmeter
(NEUTRAL)
side
ground
or
EARTH
side
ground
when
having
1000
ohms
per
volt
or
more
sensitivity
in
the
following
repairing.
manner.
Connect
a
15009
10W
resistor
paralleled
by
a
0.15
4
F
Some
model's
power
circuit:
is
partly
different
in
the
GND.
The
AC-type
capacitor
between
an
exposed
metal
part
and
a
known
difference
of
the
GND
is
shown
by
the
LIVE
:
(.L)
side
GND,
the
good
earth
ground
(water
pipe,
etc.).
Measure
the
AC
voltage
ISOLATED(NEUTRAL)
:
(+)
side
GND
and
EARTH
:
(@)
side
across
the
resistor
with
the
AC
voltmeter.
Move
the
resistor
GND.
Don't
short
between
the
LIVE
side
GND
and
connection
to
each
exposed
metal
part,
particularly
any
exposed
ISOLATED(NEUTRAL)
side
GND
or
EARTH
side
GND
and
metal
part
having
a
return
path
to
the
chassis,
and
measure
the
never
measure
with
a
measuring
apparatus
(oscilloscope
etc.)
the
AC
voltage
across
the
resistor.
Now,
reverse
the
plug
in
the
AC
LIVE
side
GND
and
ISOLATED(NEUTRAL)
side
GND
or
outlet
and
repeat
each
measurement.
Any
voltage
measured
must
‘EARTH
side
GND
at
the
same
time.
not
exceed
0.75V
AC
(r.m.s.).
This
corresponds
to
0.5mA
AC
If
above
note
will
not
be
kept,
a
fuse
or
any
parts
will
be
broken,
(r.m.s.).
:
6.
if
any
repair
has
been
made
to
the
chassis,
it
is
recommended
However,
in
tropical
area,
this
must
not
exceed
0.3V
AC
(r.m.s.).
that
the
B1
setting
should
be
checked
or
adjusted
(See
This
corresponds
to
0.2mA
AC
(r.m.s.).
i
ADJUSTMENT
OF
B1
POWER
SUPPLY).
i
7.
The
high
voltage applied
to
the
picture
tube
must
conform
with
AC
VOLTMETER
|
that
specified
in
Service
manual.
Excessive
high
voltage
can
(HAVING
1000
2/V,
i
cause
an
increase
in
X-Ray
emission,
arcing
and
possible
OR
MORE
SENSITIVITY)
;
component
damage,
therefore
operation
under
excessive
high
GOOD
|
voltage
conditions
should
be
kept
to
a
minimum,
or
should
be
padi
i
prevented.
If
severe
arcing
occurs,
remove
the
AC
power
i
immediately
and
determine
the
cause
by
visual
inspection
PLACE
THIS
PROBE
;
(incorrect
installation,
cracked
or
melted
high
voltage
harness,
ON
EACH
EXPOSED
i
poor
soldering,
etc.).
To
maintain
the
proper
minimum
level
of
soft
15002
10W
METAL
PART
X-Ray
emission,
components
in
the
high
voltage
circuitry
f
including
the
picture
tube
must
be
the
exact.
replacements
or
41.
High
voltage
hold
down
circuit
check.
alternatives
approved
by
the
manufacturer
of
the
complete
After
repair
of
the
high
voltage
hold
down
circuit,
this
circuit
shail
8
Poe
Seek
high
voltage
by
drawing
an
arc.
Use
a
high
voltage
Be
eee
Pe
Sen:
meter
or
a
high
voltage
probe
with
a
VTVM.
Discharge
the
picture
pees
OM
TiO
Se
CIOEe
We
Heat
yates
HOKIAO
WN
Creu:
i
tube
before
attempting
meter
connection,
by
connecting
a
clip
:
lead
to
the
ground
frame
and
connecting
the
other
end
of
the
lead This
mark
shows
a
fast
POWER
CORD
through
a
10k92
2W
resistor
to
the
anode
button.
operating
fuse,
the
REPLACEMENT
WARNING.
9.
When
service
is
required,
observe
the
original
lead
dress.
Extra
letters
indicated
below
Connecting
the
line
side
of
precaution
should
be
given
to
assure
correct
lead
dress
in
the
high
voltage
circuit
area.
Where
a
short
circuit
has
occurred,
those
components
that
indicate
evidence
of
overheating
should
be
replaced.
Always
use
the
manufacturers
replacement
components.
No.51370
show
the
rating.
power
cord
to"
@"
mark
side.
AV-27920
FEATURES
@
New
chassis
design
enables
use
of
a
single
board
with
simplified
circuitry.
;
@
Provided
with
miniature
tuner
(TV/CATV).
Multifunctional
remote
control
permits
picture
adjustment.
@
Adoption
of
the
CHANNEL
GUARD
function
prevents
the
specific
channels
from
being
selected,
unless
the
“ID
number’
is
key
in.
@
(°C
bus
control
utilizes
single
chip
ICs.
Built-in
HYPER-SURROUND
system.
@
Adoption
of
the
VIDEO
STATUS
function.
Adoption
of
the
ON/OFF
TIMER
function.
With
752
V/U
in
common
(F-Type)
ANT
Terminal.
SLEEP
TIMER
for
setting
in
real
time.
Closed-caption
broadcasts
can
be
viewed.
S-VIDEO
input
terminal
for
taking
best
advantage
of
Super
VHS.
Audio
Video
input
terminal.
Variable
Audio
output
terminal.
Built-in
MTS
system.
DIFFERENCE
LIST
OF
MAIN
PARTS
AV-27920(US)
—
AV-27920(CA)
Parts
Name
INST
BOOK
(FRENCH)
;
x
LCT0108-001B-A
SVC
CENTER
LIST
x
BT-20071B-Q
REGI.
CARD
BT-51006-1Q
x
WARRANTY
CARD
x
BT-52002-1Q
4
No.51370
AV-27920
OPERATING
INSTRUCTIONS
e
The
operating
instructions
are
the
same
as
for
C-20910(US&CA)/AV-20920(US&CA)/AV-20921(US&CA)
(No.51364),
Therefore,
please
refer
to
the
C-20910(US&CA)/AV-20920(US&CA)/AV-20921(US&CA)(N0.51364)
SERVICE
MANUAL
for
detailed
instructions.
@
REMOTE
CONTROL
UNIT
[RM-C754-1C]
CHANNEL
MUTING
VOLUME
©
€Ty
MENU
exit
on.
O
@
5)
@
@
FRONT
PANEL
WMENU
—
CHANNEL
+
——
VOLUME
+
POWER
4OPERATE
>
M@
REAR
PANEL
No.51370
5
|
}
i
t
|
|
7
i
|
i
|
i
|
|
i
i
|
|
|
i
a
i
AV-27920
SPECIFIC
SERVICE
INSTRUCTIONS
DISASSEMBLY
PROCEDURE
REMOVING
THE
REAR
COVER
4.
Unplug
the
power
supply
cord.
2.
Remove
the
7
screws
marked
@
and
2
screws
marked
®
as
shown
in
Fig.1.
3.
Withdraw
the
REAR
COVER
toward
you.
[CAUTION]
@
When
reinstalling
the
rear
cover,
carefully
push
it
inward
after
inserting
the
MAIN
PWEB
into
the
rear
cover
groove.
REMOVING
THE
MAIN
PW
BOARD
®
After
removing
the
rear
cover.
1.
Pick
this
side
of
the
MAIN
PWB
and
raise
one
slightly,
take
off
the
PWB
stopper
marked
©
from
the
cabinet
bottom.
2.
Pull
out
the
MAIN
PWB
as
it
is.
(If
necessary,
take
off
the
wire
clamp
and
connectors,
etc.)
REMOVING
THE
SPEAKER
@
After
removing
the
MAIN
PW
board.
1.
Remove
the
2
screws
marked
©
as
shown
in
Fig.1.
2.
Withdraw
the
speaker
backward.
3.
Follow
the
same
steps
when
removing
the
other
hand
speaker.
CHECKING
THE
MAIN
PW
BOARD
1.
To
check
the
back
side
of
the
MAIN
PW
Board.
1)
Pull
out
the
MAIN
PWB.
(Refer
to
REMOVING
THE
MAIN
PWB).
2)
Erect
the
chassis
vertically
so
that
you
can
easily
check
the
back
side
of
the
MAIN
PW
Board.
[CAUTION]
@
When
erecting
the
MAIN
PWB,
be
careful
so
that
there
will
be
no
contacting
with
other
PW
Board.
@
Before
turning
on
power,
make
sure
that
the
CRT
earth
wire
and
other
connectors
are
properly
connected.
WIRE
CLAMPING
AND
CABLE
TYING
1.
Be
sure
clamp
the
wire.
2.
Never
remove
the
cable
tie
used
for
tying
the
wires
together.
Should
it
be
inadvertently
removed,
be
sure
to
tie
the
wires
with
a
new
cable
tie.
6
No.51370
AV-27920
FRONT
CABINET
CRT
SOCKET
PWB
(Within
MAIN
PWB)
SPEAKER
MAIN
PWB
ee
Ren
A
eR
NET
MERGE
SEA
OL
Se
SA
ASO
nar
umes
termes
renee
an
gn
REAR
COVER
SPEAKER
Fig.1
No.51370
AV-27920
MEMORY
IC
REPLACEMENT
1.
Memory
IC
This
model
use
a
memory
IC.
This
memory
IC
stores
data
for
proper
operation
of
the
video
and
deflection
circuits.
When
replacing,
be
sure
to
use
an
IC
containing
this
(initial
value)
data.
2.
Memory
IC
replacement
procedure
—
ae
Switch
off
the
power
and
disconnect
the
power
cord
from
the
outlet.
(2)
Replace
the
memory
IC
Initial
value
must
be
entered
into
the
new
IC.
(3)
Power
on
Connect
the
power
cord
to
the
outlet
and
switch
on
the
power.
(4)
System
constant
check
and
setting
1)
Simultaneously
press
the
DISPLAY
key
and
VIDEO
STATUS
key
of
the
remote
control
unit.
2)
The
SERVICE
MENU
screen
of
Fig.1
is
displayed.
3)
While
the
SERVICE
MENU
is
displayed,
again
simultaneously
press
[SERVICE
MENU
J
PICTURE
SOUND
the
DISPLAY
and
VIDEO
STATUS
keys
to
display
the
Fig.2
SYSTEM
GAME
CONSTANT
screen.
LOW
LIGHT
HIGH
LIGHT
RF
AFC
CHK
4)
Refer
to
the
SYSTEM
CONSTANT
table
and
check
the
setting
items.
Where
these
differ,
select
the
setting
item
with
the
MENU
UP/DOWN
key
and
adjust
the
setting
with
the
MENU
LEFT/RIGHT
keys.
(The
letters
of
the
selected
item
are
displayed
in
yellow.)
5)
After
adjusting,
release
the
MENU
LEFT/RIGHT
key
to
store
the
setting
value.
6)
Press
the
EXIT
key
twice
to
return
the
normal
screen.
vco(
PC
BUS
CTRL
SELECT
BY
aij
&xiTBY
OPERATE
BY
Sj
(EXIT)
[
SYSTEM
CONSTANT
MTS
>
YES
VARI.OUT
>
YES
(5)
Receive channei
setting
Refer
to
the
OPERATING
INSTRUCTIONS(USER'S
GUIDE)
and
set
the
2
GAME
:
YES
receive
channels
(Channels
Preset)
as
described.
SURROUND
:
YES
S-VIDEO
>
YES
M37272M8-4SP
SELECT
BY
fal
[yi
EXIT
BY
OPERATE
BY
ie!
EXIT
(6)
User
settings
Check
the
user
setting
items
according
to
Table
2.
Where
these
do
not
agree,
refer
fo
the
OPERATING
INSTRUCTIONS
(USER'S
GUIDE)
and
set
the
items
as
described.
(7)
SERVICE
MENU
setting
Verify
what
to
set
in
the
SERVICE
MENU,
and
set
whatever
is
necessary.(Fig.1)
Refer
to
the
SERVICE
ADJUSTMENT
for
setting.
8
No.51370
AV-27920
Setting
content
TABLE
1
(System
Constant
setting)
ee
TABLE
2.
(User
setting
value)
Setting
item
.
Setting
value
1.
Use
remote
controller
keys
POWER
CHANNEL
CHANNEL
PRESET
VOLUME
DISPLAY
SLEEP
TIMER
VIDEO
STATUS
CLOSED
CAPTION
HYPER
SURROUND
2.
Setting
of
MENU
TINT
COLOR
PICTURE
BRIGHT
DETAIL
NOISE
MUTING
SET
VIDEO
STATUS
BASS
TREBLE
BALANCE
MTS
TV
SPEAKER
SET
CLOCK
ON/OFF
TIMER
CHANNEL
SUMMARY
SET
LOCK
CODE
AUTO
TUNER
SETUP
BACKGROUND
CLOSED
CAPTION
LANGUAGE
OFF
CH
02
See
OPERATING
INSTRUCTIONS.
10
OFF
O(OFF)
STANDARD
OFF(CC1/T1)
OFF
CENTER
CENTER
CENTER
CENTER
CENTER
ON
ALL
CENTER
CENTER
CENTER
CENTER
STEREO
ON
Unnecessary
to
set
NO
SET
OPTIONALLY
Unnecessary
to
set
TUNER
MODE
:
AIR
BLACK
CAPTION:
CC1
TEXT:
T1
ENG
No.51370
AV-27920
SERVICE
ADJUSTMENT
ADJUSTMENT
PREPARATION:
1.
You
can
make
the
necessary
adjustments
for
this
unit
with
either
the
Remote
Control
Unit
or
With
the
adjustment
tools
and
parts
as
given
below.
2.
Adjustment
with
the
Remote
Control
Unit
is
made
on
the
basis
of
the
initial
setting
values,
however,
the
new
setting
values
which
set
the
screen
to
its
optimum
condition
may
differ
from
the
initial
settings.
3.
Turn
on
the
power
for
set
and
test
equipment
before
use,
and
start
the
adjustment
procedures
after
waiting
at
least
30
minutes.
4.
Make
sure
that
AC
power
is
turned
on
correctly.
ADJUSTMENT
EQUIPMENT
DC
voltmeter
(or
digital
voltmeter)
Oscilloscope
Signal
generator
(Pattern
generator)
[NTSC]
Remote
control
unit
.
TV
audio
multiplex
signal
generator.
.
Frequency
counter
OnRYWN
>
ADJUSTMENT
LOCATIONS
VOL+
VOL-
CH+
CH
MENU
TP-12B
T1341
CW
TP-91
ee
(B1)
TP-E
(1)
Lav
IN
our
_]
S-IN
1C702
5.
Unless
otherwise
specified,
prepare
the
most
suitable
reception
or
input
signal
for
adjustment.
6.
Never
touch
any
adjustment
parts
which
are
not
specified
in
the
list
for
this
adjustment
-
variable
resistors,
transformers,
condensers,
etc.
7.
Presetting
before
adjustment.
Unless
otherwise
specified
in
the
adjustment
instructions,
preset
the
following
functions
with
the
remote
control
unit:
e@
VIDEO
STATUS
STANDARD
e@
BASS,
TREBLE,
CENT!
BALANCE
ENTER
ADJUSTMENT
ITEMS
B1
POWER
WHITE
BALANCE
SUPPLY
(Low
Light)
WHITE
BALANCE
IF
VCO
ead
(High
Light)
RF.
AGC
SUB
BRIGHT
FOCUS
SUB
CONTRAST
V.
SIZE
SUB
COLOR
H.
POSITION
SUB
TINT
Adjustment
items
MTS
INPUT
LEVEL
check
MTS
STEREO
vco
MTS
SAP
VCO
MTS
FILTER
check
MTS
SEPARATION
c=]
STEREO[S]
MAIN
PWB
CRT
SOCKET
PWB)
'2P
(Within
MAIN
PWB
ASS'Y)
(SOLDER
SIDE)
UPPER
:
FOCUS
LOWER
:
SCREEN
CRT
EARTH
(BRAIDED
ASS'Y)
410
No.51370