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3.
Recognizing
the SP Cl-i-l
Head Side
No playback picture can be obtained if the video
head is not
wired
as a pair with
the
rotary
transformer
located
inside
the
lower
drum
rotating
section.
Therefore,
mounting
position
should
be matched
when
mounting
the upper
drum. In the
P90 mechanism
series, the code
name of the drum
is printed
on the SP CH-1
(CH-A,
Plus
azimuth)
side
as
a
mark
for
mounting
the upper drum.
(See Fig. 5-1 1-7.) This
code name differs
according
to the drum type,
Examples
of Detailed
Classification
Codes
V = Head with
level difference
D = Compatible
with
digital
units
S = SVHS-compatible
Examples
of Code Names
2N2P, 2N2P-L, 2N2P-V, 2N2P-D, 2N3P, 2N4P, 4H4P,
4H4P-D
Moreover,
there
is
a
round
hole
with
marking
purposes
on the SP CH-1 (CH-A, Plus azimuth)
side
but
its basic form
is as
A = Number
of head bases
B = "N"
for
normal
audio
"H"
for
HI-FI audio
C = Number
of heads
follows
:
of the lower drum
rotary
transformer
terminal.
As
shown
in Fig. 5-11-8, there are two types of rotary
m
Code Name Form
transformer
terminals
(the
number
of pins differs
according
to the number
of heads).
4H4PDS
Note : When
ordering
parts
such
as
drums
ABCDEF
(CYLINDERS), do not use the code names;
D = TV system
("N"
or
"P")
always refer to the parts list and order with
EF =Code
for detailed
classification.
Depending
m
the specified
part
numbers.
drum
type, it can also be just
one character,
or a blank
space.
Except 2-head normal
audio
model.
Code Name
Positioning
Mark for
In
fixing
screw
\
Rotary
erase head's
lead wire (Model
for
flying
erase capability)
Only 2-head normal
audio
model
o
Ro~nd
Hole
(SP CH-1 side)
v
Holes for fixing
screw
Fig.
5-11-7.
Upper Drum
Fig. 5-11-8.
Lower
Drum
c-.
.
,..
,
-;-.
,.,
,.
.,.
.,..
... ...
.:
.. .:...,.,
..-.
.. ..
./, :
'...,
,
–66–
..
. .
.
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