1-A. Preliminary/Final Checking and 3. Check to see that the tape runs without creasing at
Alignment of Tape PathTake-up Guide Post [4] or without snaking between
Guide Roller [3] and AC Head. (Fig. M3 and M5)
Purpose:
4. If creasing or snaking is apparent, adjust the Tilt
To make sure that the tape path is well stabilized.
Adj. Screw of the AC Head. (Fig. M6)
Symptom of Misalignment:
If the tape path is unstable, the tape will be damaged.
Note: Do not use an Alignment Tape for this proce-Azimuth Adj. Screw
dure. If the unit is not correctly aligned, the tape may
be damaged.
AC Head
1. Play back a blank cassette tape and check to see
that the tape runs without creasing at Guide Rollers
X-Value Adj.
[2] and [3], and at points A and B on the lead sur-
Screwdriver
face. (Refer to Fig M3 and M4.)
2. If creasing is apparent, align the height of the guide
rollers by turning the top of Guide Rollers [2] andTilt Adj. Screw
Fig. M6
[3] with a Guide Roller Adj. Screwdriver. (Refer to
Fig. M3 and M5.)
1-B. X Value Alignment
Guide Roller [3]Guide Roller [2]
Purpose:
To align the Horizontal Position of the Audio/Control/
Erase Head.
AC Head
Symptom of Misalignment:
If the Horizontal Position of the Audio/Control/Erase
Head is not properly aligned, maximum envelope can-
not be obtained at the Neutral position of the Tracking
Control Circuit.
B
A
1. Connect the oscilloscope to TP301 (C-PB) and
Take-up Guide Post [4]
Fig. M3TP303 (CTL) on the Main CBA. Use TP302 (RF-
SW) as a trigger.
2. Play back the Gray Scale of the Alignment Tape
(FL8NW) and confirm that the PB FM signal is
present.
3. Set the Tracking Control Circuit to the center posi-
tion by pressing CH UP button then ? PLAY ? button
on the unit. (Refer to note on bottom of page
2-3-4.)
Lead Surface of CylinderTape4. Use the X-Value Adj. Screwdriver so that the PB
Fig. M4
FM signal at TP301 (C-PB) is maximum. (Fig. M6)
5. Press CH UP button on the unit until the CTL wave-
CorrectIncorrectform has shifted by approx. +2msec. Make sure
Guide Rollerthat the envelope is simply attenuated (shrinks in
height) during this process so that you will know
Tape
the envelope has been at its peak.
Take-up Guide
Post
Tape
Fig. M5
2-3-3U25NMA |
ACEC
