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SECTION
4
711 TYPE
(CCIR SYSTEM)
This adjustment
is performed
so that the tape runs
correctly in a set position, and has a large effect on
picture
quality and
interchangeability.
Perform
the
adjustment in the order given below.
4-1.
Terminology
The
No.
0 to 6 guides on the tape guide location
diagram (Fig. 4-1) are called the entrance side guides,
and
No.
7 to
10 guides are the exit side guides.
When the alignment tape (KR5-2H) is played, the side
to the left of center of the RF output waveform on
the oscilloscope
is called the "entrance
side'', and
the waveform is mainly affected by the entrance side
guides. The right side is called the "exit side" and is
mainly affected by the exit side guides. (Fig. 4-2)
No
3 adj
{
:
peice
shih
No. 5 guide lateral adjustment screw
No. 5 guide
video head
lock screw
me
%
No. 6 guide
AV
\f
(O)
lock screw
head
.
No. 9 guide
eC} video
No. 10 guide
pinch roller
/
4-2.
Preparations for Adjustment
Fig. 4-1
Tape Guide Location Diagram
id
it side
;
;
sn
see
eo
1)
Clean
the
tape
running
surfaces
(tape guides,
4
s |
drum, capstan, pinch roller, ACE head, etc.) with
a cleaning cloth dipped in methanol.
:
2)
Remove
the cassette
lid of the alignment tape
(KR5-2H)
according
to the instructions
in the
Service Manual.
3)
Connect the oscilloscope to RF board RF output
pin and
the external
trigger
to the switching
Fig. 4-2
RF Output Waveform
pulse pin.
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