6290 Module Removal Instructions - JBL 6290 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