Crown D-150 - Operating Precautions; Load Protection Methods

Removal of Contre Plate Assembly
Reter to Figure 6-400 0) :
1.
Remove
board
and
electronics
cover
as
described
in
para-
graph
5.4.1,
Step
4.
2.
Remove
two
screws
(©)
from
top
of
contro}
plate
assembly,
40951.
3.
Carefutly
lift
contro!
plate
assembly
and
turn
nearest
edge
(where.
screws
were
removed)
upward
until
bottom
of
contro!
plate
is
accessible.
Do
not
place
unnecessary
strain
on
wiring
connected
to
main
PC
board.
Refer to Figures 6-2 and 6-3.
1.
Remove
board
and
electronics
cover
(paragraph
5.
At,
Step).
Both
component
and
solder
sides
of
board
are
nowaccessible.
3. The IC is a plug-in component. -
4.
Resistors
(R111,
R211)
(selected
bias
resistors)
aré
plug-in
§.4.4 Selaorat of nt ay
Potentiometers (R101, R
to-terminals of new input level
6.
Pacers
new
aN
in
‘poshien
and
‘replace
contra!
nut
7. Replace control plate assembiy; paragraph 542.
‘8:
Replace
board
arid
electronics
cover,
paragraph
6.4.1.
5.4.5 Replacement of Thermal Switch, SW-1
Refer to Figure 6-2.
. Remove bottom cover (paragraph 5.4.1, Step 2).
2. Remove beard and electronics cover (paragraph 5.4.1, Step 4).
Disconnect two Faston connectors @ @ from terminais of
thermal switch SW-1.
4. Remove two each, screws
Ge) , solder tugs so
the chassis.
5. Place new thermal switch SW-1 in-position and-replace hard.
ware removed in Step4,
_
ad
shex nuts G3 , star washers
thermal switch SW-1 from
Refer to Figure 62. 7
1. Remove: trarisformer cover -and transformer wraps: -around
(paragraph 5 4:7 “Step 3). :
ecrrcaeh tae Stet a
S
a
2
ee
@ cor vane dm nt
ince tint igs DEA position and replace hardware ré-
moved in'Step 4.
6. Recorinect four Faston ¢ connectors (19) _) @ to terminals of
bridge OM I.
Ve Replace bottom COVEr w(patigrochvbd: 1, Step 2).
4. Remove,
bad
8. Replace. “transformer ‘cover and ‘transformer wrap-around
(paragraph 5.4.1, Step 3).
Refer to Figure 6-2.
1: Tessie bation cove <paraieph 6.4.2, Step 2).
2. Remove. transformer. cover. and ‘transformer wrap-around
(paragraph 5.4.1, Step 3).
3. Remove ene Faston-cannector @. Bt fromm filer capacitor
(C23 er C24) terminal.
J RRR