Philips 900 Series - Guarantee and Service Information; Warranty Coverage and Exclusions

CIRCUIT DESCRIPTION 20
2.2.4 Play Reverse position
$07
PLAY REVERSE 5008
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Fig. 10. Command gearwheel in Play Reverse.
To obtain the Play reverse mode the first
solenoid pulse releases the command
gearwheel. The second pulse is given is
given in the part of the gearwheel where item
507 can choose for mid track or inner track.
This second pulse activates bracket 112 and
with the extension part of that bracket the
guiding pin of item 507 is shifted onto the
inner track. With this movement the total
bracket 507 is moved sidewards, resutting in
head rotation. The gearwheel turns 3/4
quarter part equal to the Play position but
now in Play Reverse defined mode. See
figure 10. The first next pulse to the solenoid
in the Play reverse mode will bring the
mechanism back again into the stop mode in
the same way as described in the play
forward mode.
2.2.5 Search “A" head position
«AHEAD SEARCH FORWARD/REVERSE "6'28
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£4.
Command
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in
ite
“A”
head
position Search Forward or Search Reverse.
To get from Play forward into the “A” head
search forward or reverse mode the following
actions are made. Mechanism in Play forward
means that guiding pin 507 is in mid track. At
the moment there is a first pulse from the
solenoid, bracket 112 will release command
gearwheel. When the solenoid remains
activated the bracket 112 is driven to the
inside of its cam and instead of a slalom near
the search opening in the command
gearwheel, now the bracket locks against the
nock on the cam. As fong as the solenoid is
activated this position is kept. As the
gearwheel has made a small rotation the
head support assembly 117 is kept very near
to the tape and search mode has been
obtained.
Depending on the direction of the winding
motor the forward or reverse Search mode is
actual. See figure 11.
2.2.6 Search “B" head position
«B'HEAD SEARCH FORWARD/ REVERSE '?8
ree
Fig. 12, Command gearwheel in the "B” head
Position Search Forward or Search Reverse.
The same principle as described before is
used when coming from the reverse play
mode into the "B" head search position. See
figure 12. Via 507 is the head in the "reverse"
or B-head position. As long as the solenoid is
actuated this search mode will be kept as
described in “A* head search mode.
2.3 Azimuth adjustment
With the introduction of FATG (Fixed Azimuth
Tape Guides) combined with ALP (Azimuth
Lacking Pins) the tape ie forced to pases the
head in vertical position. So the adjustment of
the Azimuth has been changed. Now the
adjustment can better be checked optical with
the mirror cassette. (4822 395 30288). This
mirror cassette has no ALP that’s why only
the influence of the FATG is seen. The right
azimuth position is obtained in case the tape
moves synchronous over the left and right
part of mirror picture. See figure 13 and 14.
FD wi
Fig. 13. Azimuth adjustment in Play forward mode.
Fig. 14, Azimuth adjustment in Play reverse mode.
tape direction
CIRCUIT DESCRIPTION
On both figures a separate drawing of the
mirror picture is shown. On that drawing the
head is divided into two equal parts by an
imaginary line vertical in the mid of the head
surface.
When the tape passes without the ALP
guiding there is shown folding line on it. The
ideal azimuth position is obtained when both
parts of the picture show the same
(synchronous) result.
In drawing: the X1 part has to equal to the X2
part. With the Azimuth screw at tape supply
side, (left and right from the head, dependant
from tape direction, which has to be used) the
azimuth can be adjusted.
bottom”
ixt tx2!
Adjust: X1=X2
Adjust: X1=X2
PCS
83
520
PHILIPS
SOUND
&
VISION,
BG
AUDIO
-
Service
Training
PHILIPS
SOUND
&
VISION,
8G
AUDIO
-
Service
Training
PCS
83
521