RCA Victor TRK-12, Manual

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PAGE 2 5 6 -C
TRK9, TRK90, TRKI2, TRKI20
7. Rotate the Kinescope and cardboard container (but
not the yoke), so that the second anode cap at the side of
the tube is towards the front of the cabinet.
8. Place the white rubber mask on the face of the Kine-
scope, with the ribs on the mask facing upwards toward the
mirror. Line up the mask so that it masks the edges on the
Kinescope face. Then, if necessary, lift the Kinescope and
rotate it so the mask is .'approximately squared up with the
cover opening! The second anode cap should be kept towards
the front of the cabinet.
9. Replace the safety glass cover and wing nuts. Tighten
wing nuts to hold the cover securely.
10. Loosen the wing nuts “ F” on the yoke mounting
bracket and push the two metal brackets, on which the bot-
tom of the yoke rests, upward, until the rubber mask rests
against the top cover. If the mask and the cover opening do
not line up, rotate the cone-shaped Kinescope shield until
they do. TighteA the wing nuts to hold the yoke and tube in
this position. In some cases it may be necessary to loosen the
four screws holding the yoke support to the wooden frame
and shift the yoke support to make the mask and Kinescope
II W
OC MSTOX* WOIO * 0 ? ? * S,M e'*
Figure 5A — Top
View
T R K -9, TR K -12 Video Chassis
V id e o
When it is desired to measure any voltages on (his chassis,
the primary leads of the high voltage transformer T6 (T 9—
50 cycle models) should be disconnected and taped together.
When any changes have to be made in the Video chassis,
the lead and part locations should be replaced as closely as
possible to the original positions.
Because of the special equipment and procedure necessary
for the proper alignment of these receivers, the alignment
will not
dc
covered in this service note.
Refer to the booklet: Practical Television by RCA, for de­
tailed explanations of circuit operation in a Television re­
ceiver.
Service Hints:
1. Poor Horizontal Distribution of the picture elements
may be due to a 6L6 tube. RCA-6L6 tubes of known recent
manufacture, are*the only tubes recommended for the Hori­
zontal sweep output circuit. By careful scrutiny, these tubes
can be identified by the three “ rings" or sections welded to*
line up symmetrically with the cover opening.
11. Place the second anode lead on the second anode cap
at the side of the Kinescope.
12. A fter the receiver is operating, and if the picture is
not squared up with the cover opening, the two screws “ H “
on the band around the yoke should be loosened, and the
yoke rotated to square up the picture, then these screws
should be tightened with a screw oriver.
Focusing Control.—This is,a screw driver adjustment lo­
cated on the right side of the cabinet near the base. On early
production receivers, a knob located at the bottom, rear of
the cabinet is the focus control.
Adjustments.— There are
a
series of screw driver slot ad­
justments at the rear of the TRK-12 and TRK-120 (at the
side of the TRK-9 and TRK-90), used to obtain the proper
picture size, centering, and vertical distribution. These ad­
justments are explained fully in the receiver operating in­
structions, and also in the booklet: “ Practical Television by
RCA.”
W hen the receiver is moved from one location to another
some readjustment of these controls may be necessary.
Figure 5B— Top V in o TRK-90, TRK-120 Video Chassis
Chassis
gether at* the base ring of the tube, as shown in Figure 6. If
any other 6L6 tube is used in this position it will break down
in a very short time.
Figure A— Recommended Type 6L6 Identification