Seeburg 7800, Service Manual

Page: 19 / 87

c
OPERATION AND MAINTENANCE
I . G E H E R A L
A. APPEARANCE
It
is important that the
general upkeep and the good ap­
pearance of the l.nstrument be
waintained.
A
careful selection
of good quality records appro­
priate for �he location should
be wade. Typewritten or printed
title slips should be used at
all times. Th!s not only adds
to the attractiveness of the in-
2trument, but increases its
earnings.
B .
Li..'BR!CA'l'ION
Oil the gears occasionally
using an autowobile oil having a
viscosity of
SAE-10. Oil
all
friction points7 such as the
high speed t�ansmission bearings
and the selector feed clutch
plates on the toothed rack. We
recommend this oil inasmuch as
ordinary light sewing machine oil
on the turntable shaft, the
transwission shaft, or the trans­
mission bearings has not enough
body to retain proper lubrica­
tion. The slide grooves may be
oiled sparingly should the record
carriers become binding or
sticky. If grease has been used
in the slide grooves or the
grooves becowe gritty or gummy,
the record carrier may bind.
They should be washed thoroughly
with a light grade of good qual­
ity lubricating oil. Wipe clean
and re-oil sparingly.
DO NOT
USE
IJA
S
ELI N E O� 1\NY
GREASE
IN
THE
SLIDE GROOVES AS
IT �/ILL
GUN
UP
QUICKLY GAUSIN
G
A REAl!Y LOAD
ON
THE SELECTOR SLIDE PLATE.
2 .
T O !l f ARM
A,
TONE ARH
\•/EIGHT .PJJJUSTMENT
On
Model
7800
the weight of
the tone arw at the needle with
the needle just barely clearing
the record should be approximate­
ly
3.5
ounces.
On
Models
7850, 8800
and
9800,
which use tone arm F-3110,
the weight when tested as above
should be -
2.5
ounces.
When using the weight scale
in Fig.
5,
the indicator pointer
of the scale should be directly
opposite the needle screw just as
the needle is leaving the grooves
of the record.
If a weight test is wade
while the instrument is playing,
I I
it is easy to determine just when
the needle starts lifting out of
the grooves.
It is best to make all
weight tests near the start of a
record.
On
J�odel
7800
correct
weight may be obtained by bend­
ing the flat spring underneath
the tone arw upward or d
0\n1
ward
to
decrease or increase the
weight.
On Models
7850, 8800
and
9800
the correct weight may be
obtained by turning the screw
(located in the top and approx­
imate center
of
the tone arw)
in to decrease the weight, and
out to increase the weight.