Toshiba DVR80KF Service Manual page 107

Dvd/ video cassette recorder
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1-A. Preliminary/Final Checking and
Alignment of Tape Path
Purpose:
To make sure that the tape path is well stabilized.
Symptom of Misalignment:
If the tape path is unstable, the tape will be damaged.
Note: Do not use an Alignment Tape for this proce-
dure. If the unit is not correctly aligned, the tape may
be damaged.
1. Playback a blank cassette tape and check to see
that the tape runs without creasing at Guide Rollers
[2] and [3], and at points A and B on the lead sur-
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] and
[3] with a Guide Roller Adj. Screwdriver. (Refer to
Fig. M3 and M5.)
Guide Roller [2]
A
Take-up Guide Post [4]
Lead Surface of Cylinder
Correct
Guide Roller
Tape
Take-up Guide
Post [4]
Tape
3. Check to see that the tape runs without creasing at
Take-up Guide Post [4] or without snaking between
Guide Roller [3] and ACE Head. (Fig. M3 and M5)
Guide Roller [3]
ACE Head
B
Fig. M3
Tape
Fig. M4
Incorrect
Fig. M5
4. If creasing or snaking is apparent, adjust the Tilt
Adj. Screw of the ACE Head. (Fig. M6)
Azimuth Adj. Screw
ACE Head
Tilt Adj. Screw
1-B. X Value Alignment
Purpose:
To obtain maximum PB FM envelope signal at the pre-
set position of the Tracking Control Circuit, align the
Horizontal Position of the ACE Head.
Symptom of Misalignment:
If the Horizontal Position of the ACE Head is not prop-
erly aligned, maximum PB FM envelope cannot be
obtained at the preset position of the Tracking Control
Circuit.
1. Connect the oscilloscope to TP301 (C-PB) and
TP503 (CTL) on the BOARD AV. Use TP504 (RF-
SW) as a trigger.
2. Playback the Gray Scale of the Alignment Tape
(FL6NS8) and confirm that the PB FM signal is
present.
3. Set the Tracking Control Circuit to the preset posi-
tion by pressing [PROGRAM
[ B] (VCR) button on the unit. (Refer to note on
bottom of page 2-3-4.)
4. Use the Flat Screwdriver so that the PB FM signal
at TP301 (C-PB) is maximum. (Fig. M6)
2-3-3
Flat
Screwdriver
Fig. M6
] button and then
N25E1FLMA

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