JBL 6290 User Manual

6290
MODULE
REMOVAL
INSTRUCTIONS
(From
Serial #3171
and up)
1.
Place
amplifier
flat
on
bench
with fan
facing
towards
you
and
line
cord on
the
left.
Remove
cover
and unplug
red
8
pin
and
5
pin
connectors
near
front
panel.
2.
Remove
the
following
Faston
single
blade
connectors
from PC
board
using
your
hand or
sturdy
pair
of
needle-nose
pliers to
grasp the
barrei
of the
connector.
DO
NOT PULL
ON
WIRES,
as
this
may
seriously
weaken the
strength
of
the
connection.
(Rocking
the
connector
from side
to
side
while
pulling
the
connector
helps
in
removal).
Remove:
A.
Black
wire
that is
bundled with
cables
going to
red
5
pin
connector.
(This
is
the
input
ground).
B.
Black,
red,
and
green
wires
coming
from
right
side
of
amplifier.
(These
are
the
high
voltage
power
supply
wires).
C.
Two
white
wires
from
transformer
at
pink
Faston
connectors.
(Low
voltage
AC)
.
3.
Turn
amplifier
over.
Remove
cover
and
diconnect
the
same wires
as
on
previous
side.
Refer
to Fig.
B.
4.
Remove
the
five
most
rearward
screws
on
each
side
of
chassis
(a
total of
ten)
and
gently
pull
heatsink/fan
assembly
towards you
-
approximately
one
inch.
Locate
power
switch
on
right
side of
front
panel
(Channel B)
and
carefully,
using
needle-nose
pliers
to grasp
barrel of
Faston
connector,
remove
white
wire,
white
and
small
green
wire,
and lower
black
wire.
Remove
connector
containing
large
blue
and
small
white
wire
from
right
side
transformer.
The
heatsink/fan
assembly
can
now be
set
on Its
back
with
PC
boards
facing up
for
service.
5.
When
ready to
reassemble,
move
heatsink/fan
assembly
back
into the
position
it
was in
before it was
set on
its
back.
Reconnect
wires
to
transformer,
switch,
and PC
board.
(See
Fig. A
for
switch
wire
locations).
6.
Tip
the
heatsink/fan
assembly
slightly
backward
while
moving
it
in
toward
front of
amplifier.
Looking
on
the
right
side at
bottom PC
board,
gently
move
assembly
so
board moves
into slot in
sheetmetal.
At
the
same
time,
take
care
that top PC
board
also
moves
into its
slot.
7.
Reinstall ten
screws
by
adjusting
chassis
until
holes
line
up.
Install
cover
and turn
amplifier
over.
Reconnect
all
wires,
install
top
cover,
and
verify
proper
operation.
Suggestion:
When
disassembling,
hang
white
transformer
wires
and red
and
black
HVDC
wires
over
front
panel
to
keep out
of
the way.
Hang
red
five
pin over
pot
bracket to
keep
it
out
of the
way.
FIG.
A
WHITE
GREEN
WHITE
POWER
SWITCH
CHANNEL
B
TRANSFORMER
BLACK
BLACK

JBL 6290 Specifications

General

Brand	JBL
Model	6290
Category	Amplifier
Language	English