Service Adm1nistrat1ve Support
4027/27A
RELIABILITY
MODS
TO
DEFLECTION
BOARD
(CONT.)
this
ClOO,
a
68
pf capacitor
(P/N
281-0785-00)
and
RlOO,
a
51
ohm
resistor
(P/N
315-0510-00)
was
added
to
the input of the
Phase
Shifter
circuit.
To
install
these,
first
cut
the
run
on
the
back
of
the
board
between
TPlOl
and
pin 1 of
UlOl.
Then,
on
the front of
the
board,
add
the resistor
between
TP101
and
pin 1
of
UlOl
and add
the capacitor
between
pins 1
and
8 of
UlOl.
Some
of these
problems
were
al
so
suspected
as
a cause of intermittent
failures of
Q121
and
Ql91
on
the
low
voltage
power
supply.
These
fixes
along
with
some
improved
assembly
processes
appear
to
have
corrected
this
failure.
w2
Issue
13-21
4052/4052A/4054/4054A
FIRMWARE
INFORMATION
The
chart
on
the following
page
is
a
list
of
all
the
CRC's
for the 4052/4052A/4054/
4054A
system firmware
and
current level
firmware of
each
4052/4052A/4054/4054A
ROMpack.
'
w2
Issue
13-19
4054/4114/4016-l/GMA101A/GMA102A/GMA125
618
POWER
SUPPLY
INTERCONNECT
CABLE
MODIFICATION
Reference:
Mod
#M43296
4054
Service
Manual,
p.n. 070-2839-03
4114
Service
Manual,
p.n. 070-3818-00
4016-1
Service
Manual,
p.n. 070-4551-00
GMA101A
Service
Manual,
p.n. 070-2598-00
GMA102A
Service
Manual,
p.n. 070-3635-00
GMA125
Service
Manual,
p.n. 070-2618-00
618
Service
Manual,
p.n. 070-2767-00
October,
1983
laeue
31
The
4054,
4114
power
supply interconnect
cable {p.n. 175-2684-00)
and
the 4016-1,
GMA101A,
GMA102A,
GMA125
and
618
power
supply interconnect cable {p.n.
175-2006-00),
have
both
been
changed
to
p.n.
175-2006-02.
The
Molex
connectors
used
in the
power
supply interconnect
cables {p.n. 175-2684-00)
and
{p.n.
175-2006-00)
have
had
a
history
of poor
contact
reliability.
The
single contact type connectors {p.n.
131-1790-00)
and
Molex
housing (p.n.
· 204-0751-00)
have
been
replaced
by
three
point
Molex
Trifurcon connectors (p.n.
131-2728-00)
and
Molex
housing (p.n.
352-0652-00). Also, the cable
has
been
lengthened
from
16"
!·5
to
17"
!.250.
The
serial
number
breaks for the
products
that
have
the
mod
incorporated
at
the Factory are
as
follows:
4054
8012326
4114
8021445
4016-1
8041160
GMA101A
8043859
GMA102A
8065634
GMA125
8040525
618
8013181
When
installing
a
new
cable, the pins
that
have
overheated
and
have
discolored
the
circuit
board and/or the housings of
the old cable, should
be
resoldered.
Reason
for doing
this
is
that
any
pins
that
have
overheated,
may
have
caused
their
corresponding solder
joints
to
deteriorate
(melt
and
oxidize).
The
power
supply interconnect cable
connector housings should
be
visually
inspected for discoloration,
and
the
corresponding pins for contact surface
deterioration
anytime
that
service
is
required
on
an
applicable product.
w2
Issue
13-17
-20-
)
)
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