Philips MX5100VR Service Manual page 136

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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
Tape
Guide Roller [3]
ACE Head
B
Tape
Incorrect
Take-up Guide
Post
10/31/2012
3. Check to see that the tape runs without creasing at
Take-up Guide Post [4] or without snaking between
Guide Roller [3] and AC Head. (Fig. M3 and M5)
4. If creasing or snaking is apparent, adjust the Tilt
Adj. Screw of the AC Head. (Fig. M6)
AC Head
Tilt Adj. Screw
1-B. X Value Alignment
Purpose:
To align the Horizontal Position of the Audio/Control/
Erase 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.
1. Connect the oscilloscope to TP301 (C-PB) and
TP503 (CTL) on the Main CBA. Use TP504 (RF-
Fig. M3
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 center posi-
tion by pressing "VCR" button and "KCH" button
on the remote control unit then pressing "PLAY"
button on the unit. (Refer to note on bottom of page
2-3-4.)
Fig. M4
4. Use the X-Value Adj. Screwdriver so that the PB
FM signal at TP301 (C-PB) is maximum. (Fig. M6)
5. Press "KCH" button on the remote control unit until
the CTL waveform has shifted by approx. +2msec.
Make sure that the envelope is simply attenuated
(shrinks in height) during this process so that you
will know the envelope has been at its peak.
Fig. M5
2-3-3
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Azimuth Adj. Screw
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X-Value Adj.
Screwdriver
Fig. M6
E9015MA