Reassembly.
Reassemble
the
Attenuator
Board
in
the
re-
verse
order
of
Disassembly.
ATTENUATOR
BOARD
REPLACEMENT.
Replace
the
Attenuator
Board
in
the
reverse
order
of
Removal.
FUNCTION
BOARD
REMOVAL.
Removal
of
the
Function
Board
is
identical
to
removal
of
the
Attenuator
Board.
Disassembly.
No
further
disassembly
is
covered
here. Dis-
assembly
of
the
pushbutton
switches
is
covered
under
Parts
Replacement.
Reassembly.
Reassemble
the
Function
Board
in
the
reverse
order
of
Disassembly.
FUNCTION
BOARD
REPLACEMENT.
Replace
the
Func
-
tion
Board
in
the
reverse
order
of
Removal.
SECONDARY
POWER SUPPLY
REMOVAL.
To
remove
the
Secondary
Power
Supply,
perform
the
Removal
steps
for
the
cabinet,
batteries,
A/D
Converter
Board,
and
crt.
Then
proceed
as
follows
(see Figure 4-7):
CRT
RETAINER
RING
I
LINE
CONVERTER
CHASSIS
Maintenance-213
Service
1.
Disconnect
the
terminal
connector
holder
between
the
Secondary
Power
Supply
Board
and
the
Power
Supply
Board.
2.
Turn
the
instrument
on
its side
and
remove
the
two
nuts
holding
the
Line
Converter
Chassis
to
the
Amplifier
Board
(see
Figure
4-2).
3.
Gently
I ift
the
Line
Converter
Chassis
out
of
the
instru-
ment.
Remove
the
electrical
contacts
and
set
them
aside
for
reinstallation.
Disassembly.
At
this
point,
disassembly
instructions
are
limited
to
mechanical
disassembly.
Proceed
as
follows
(see
Figure
4-7):
NOTE
Operator safety
is
dependent upon the electrical
separation between the power line and instru-
ment
common, which
is
dependent upon the
proper installation
of
parts and the spacing be-
tween them. Therefore, disassembly
of
the Se-
condary Power Supply is
not
recommended
unless a trouble has been definitely isolated to
that particular component.
RECTIFIER
NETWORK
(WIRED
SUBSTRATE)
LINE
CONVERTER
COVER
I
1481-3
Figure
4-7. Secondary Power Supply disassembly.
@
4-9
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