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9) Check that the No. 3, 4 and 5 guides space and
curl satisfy the specifications.
Space: None for all three guides
Curl:
No.
3, 4 guides,
less than
Imm.
None
for No. 5 guide.
2-5.
Audio/CTL Position Adjustment
1) Audio Head Azimuth Adjustment
Refer to the section on "Audio Head (ACE ass'y)
Azimuth Adjustment" in the Service Manual.
Connection of Equipment:
The
connections
of the
equipment
to the input/
output terminals are shown in Fig. 2-22.
audio oscillator
Ee)
attenuator
| [ooo
Fig. 2-22
Connections
(1) Terminate the audio line output terminal with
a 100kQ resistor and connect
a VTVM.
(2) Play back the 5kHz signal segment of the align-
ment tape (KR5-2H).
(3) Adjust the azimuth adjustment screw on the audio
head for a maximum
VTVM
reading. (See Fig. 2-
22).
Note:
Loosen
azimuth
adjustment
screw before
the adjustment
and
tighten
it after
the
completion.
-
2) CTL Position Adjustment
Adjust ACE
head position so that the RF output
waveform is maximum
when the tracking control
knob at center click.
Refer to the section on "ACE Assembly Position
Adjustment" in the Service Manual.
Note:
Be sure to perform
with tracking control
knob at center click.
Position Adjustment of ACE Assembly
@
This
adjustment
includes
the mechanical
head
mounting
position
adjustment
and the electrical
tracking control center adjustment.
@
The adjustment sequence is to perform the track-
ing control center adjustment and then the mecha-
nical adjustment
of the head mounting position.
-If this sequence is reversed, poor tracking occurs.
(1) Connect
a dual-trace
oscilloscope
as follows.
CHE
Sos
ea hee Oy Been Paki
Be RF OUT
CH-2. 2... L o v Bite ete Fo epg mere ee aes AUDIO OUT
Ext trigger... ..... SWITCHING PULSE OUT
(2) Play back (811 mode) the 1MHz segment of align-
ment tape KR5-2H (See Fig. 2-23).
(3) Set
the
tracking
control
to the
center
detent
position and confirm
that the output waveform
level is maximum
and
the 0 level point of the
audio
signal appears
at the Bch waveform
point
as shown in Fig. 2-23. If the specification is not
satisfied, perform the following Step 4.
Bch waveform point
CH-1
(RF output__]
ach
waveform)
CH-2
laudio output AVIA
AAA
waveform)
O level
Fig. 2-23
Position Adjustment of ACE Assembly (1)
(4) Perform the tracking control center adjustment.
(5) Set the TRACKING
control knob to its center
detent point and play back the 1MHz segment of
the alignment tape (KR5-2H).
(6) Loosen
the two position adjusting screws of the
ACE head and adjust the cut-out section of section
A for maximum RF output waveform and a 0 level
of audio signal at the Bch waveform
point. (See
Fig. 2-23.)
Note:
Perform the adjustment so that the center
of the cut-out section of the A section will
almost
match
the
center
of the round
hole.
(7) Play
back
the
1MHz
segment
of the alignment
tape and confirm the proper picture appearance.
(8) Tighten the position adjusting screw of the ACE
head.
;
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