Philips 900 Series - Cleaning Instructions; Cleaning Components

17
2 TAPE DRIVE PART MECHANICAL
The tape drive part consists of the loader part
and the CMRD high speed DCC tape deck
mechanism. The loader is a Landscape Tray
Loader (LTL). Other loader types can be
applied in other sets, more details about
loader can be found in concerning service
manuals. In this description only attention is
paid to the tape deck drive mechanism part.
In figure 5 the Exploded view of this CMRD
deck has been shown.
The deck is the ‘CMRD’ deck, with ali DCC
switches and on the supply and the take up
reel a tacho generator (6 pulses/rotation). The
wind motor is suitable for high speed winding
(50 x the normal play speed).
By use of the software information from the
reel tachos there is no need for a quick
reverse sensor to indicate tape end. With the
information from the tacho reels the speed
will be adapted at the moment the tape end
approaches.
Fig. 6. Head support assembly.
NOTE: The positioning of the cog (item 502)
and gearwheel (item 501C) is very
critical too. (Head positioning in
SAY sector and "8" sector mode.) In
CASE (Lam 502 deviates from its
CIRCUIT DESCRIPTION
2.1 Head support
FIRST OF ALL A FEW SERVICE HINTS
CONCERNING THE HEAD SUPPORT:
* Do not demount head support assembly,
(head indentation)
* How handling DCC head
2.1.1 The head indentation
The head support, item 117 on the exploded
view, is an assembly which carries the
DCC-head. This DCC-head is in the factory
adjusted on indentation depth. It is advisable
to keep item 117 mounted.
This head support assembly is drawn
separately in exploded view form in figure 6
to make ease recognizing of parts possible. It
consists of command lever item 117B, head
support item 117A, head item 501 (A to E)
and cog item 502.
N7A
original position the head rotation by
180 degrees will not be obtained.
The result is bad functioning in
reverses or “&" sector mode.
i
PHILIPS
SOUND
&
VISION,
BG
AUDIO
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Service
Training
PCS 83 517