6. Press CH DOWN button on the unit until the CTL1-D. Azimuth Alignment of Audio/Control/
waveform has shifted from its original position (notErase Head
the position achieved in step 5, but the position ofPurpose:
CTL waveform in step 4) by approximately -2msec.
Make sure that the envelope is simply attenuatedTo correct the Azimuth alignment so that the Audio/
(shrinks in height) once CTL waveform passes itsControl/Erase Head meets tape tracks properly.
original position and is further brought in the minusSymptom of Misalignment:
direction.If the position of the Audio/Control/Erase Head is not
7. Set the Tracking Control Circuit to the center posi-properly aligned, the Audio S/N Ratio or Frequency
tion by pressing CH UP button and then ? PLAY ?Response will be poor.
button.1. Connect the oscilloscope to the audio output jack
1-C. Checking/Adjustment of Envelope on the rear side of the deck.
Waveform2. Playback the alignment tape (FL6NS8) and confirm
that the audio signal output level is 8kHz.
Purpose:
To achieve a satisfactory picture and precise tracking.3. Adjust Azimuth Adj. Screw so that the output level
Symptom of Misalignment:on the AC Voltmeter or the waveform on the oscil-
loscope is at maximum. (Fig. M6)
If the envelope output is poor, noise will appear in the
picture. The tracking will then lose precision and theDropping envelope level at the beginning of track.
playback picture will be distorted by any slight varia-
tion of the Tracking Control Circuit.
1. Connect the oscilloscope to TP301 (C-PB) on the
Main CBA. Use TP504 (RF-SW) as a trigger.
2. Playback the Gray Scale on the Alignment Tape
(FL6NS8). Set the Tracking Control Circuit to the
center position by pressing CH UP button and thenFig. M7
? PLAY ? button on the unit. Adjust the height of
Guide Rollers [2] and [3] (Fig. M3, Page 2-3-3)
watching the oscilloscope display so that the enve-Dropping envelope level at the end of track.
lope becomes as flat as possible. To do this adjust-
ment, turn the top of the Guide Roller with the
Guide Roller Adj. Screwdriver.
3. If the envelope is as shown in Fig. M7, adjust the
height of Guide Roller [2] (Refer to Fig. M3) so that
the waveform looks like the one shown in Fig. M9.
4. If the envelope is as shown in Fig. M8, adjust the
height of Guide Roller [3] (Refer to Fig. M3) so thatFig. M8
the waveform looks like the one shown in Fig. M9.
5. When Guide Rollers [2] and [3] (Refer to Fig.M3)Envelope is adjusted properly. (No envelope drop)
are aligned properly, there is no envelope drop
either at the beginning or end of track as shown in
Fig. M9.
Note: Upon completion of the adjustment of Guide
Rollers [2] and [3] (Refer to Fig. M3), check the X
Value by pushing the CH UP or DOWN buttons alter-
nately, to check the symmetry of the envelope. Check
the number of pushes to ensure center position. TheFig. M9
number of pushes CH UP button to achieve 1/2 level
of envelope should match the number of pushes CH
DOWN button from center. If required, redo the ?X
Value Alignment.?
2-3-4DUALPALMA |
ACEC
