Mechanical jamming problem with CD shuffle carrier mechanism

[Nigel Cook]

Am wrestling with a 5 CD shuffle mechanism on a Panasonic SA CH 74
Does anyone know of a general resource for mechanical problems wth variants
of these beasts ?
This one has 5 separate platters to hold each CD.
On entry the CD sldes along the bottom ,is elevated by the laser + spinner
assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated
position and the main slide mchanism returns the carrier to the top of the
stack of 5 after playing.
Anyway something ,undiagnosed ,causes the top level transfer to stick part
across ,cannot see what ,
with all the mechanism in active position. As a fall-back ,disabling the
pawls and associated high level slideway the carrier will move in and out at
low level for single CD operation without jams.
Unfortunately a flimsey microswitch monitors carrier across the top and i
won't know what effect non-switching of this micro will have until i
rerassemble it all.
Marvelous array of mechanisms all coming off the one motor drive or it would
be
if it worked. What sort of mind designs these mechanisms, rotary,rack and
pinion, latches, slideways,reciprocating motions

e-mail (removing .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England

 

[Nigel Cook]

Marvelous array of mechanisms all coming off the one motor drive or it
would
be
if it worked. What sort of mind designs these mechanisms, rotary,rack and
pinion, latches, slideways,reciprocating motions

e-mail (removing .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England

twenty years ago i accidentally came across a series of books in a
library,stuffed full of weird and wonderful mechanisms.
Should anyone have an interest in this sort of area including repair of
automota etc I just went back to the on-line catalogue of the same library
and it is still on their shelves.

Ingenious Mechanisms for Designers and Inventors
Volume I: Franklin D. Jones; 1930, 536 pp, illustrated, ISBN 0-8311-1029-5
more detailed info found on
http://www.normas.com/INDLPR/pages/10848.html


Each of the four volumes of Ingenious Mechanisms is an independent treatise
on the subject of mechanisms. The books are similar in size and general
character, but the contents are different. The mechanisms described are
grouped into chapters according to general types. Together with the complete
index, this arrangement by function makes it easy to find the class of
movement desired, and enables you to compare mechanisms which are similar in
purpose but different in design. The descriptions and illustrations are
confined to the important and fundamental elements, so that time is not
wasted reading a lot of useless or irrelevant detail. You are told plainly
and briefly what each mechanism consists of, how it operates, and the
features which make it of special interest. The particular mechanisms have
been selected because they have stood the test of actual practice. Among the
mechanisms described and illustrated by working diagrams are: cam
applications and special cam designs; intermittent motions from gears and
cams; interlocking devices; valve diagrams; reversing mechanisms of special
design; tripping or stop mechanisms; drives of crank type for reciprocating
driven members; feeding mechanisms and auxiliary devices; feeding and
ejecting mechanisms; and many, many more.

Features:
.. Gives inventors and designers concise, illustrated descriptions of many of
the most ingenious mechanical movements ever designed.
.. Presents specific ingenious mechanisms that have stood the test of actual
practice.
.. Each volume represents an independent treatise, making it self-contained.
.. Fully describes and illustrates with working diagrams cam applications and
special cam designs, interlocking devices, valve diagrams, tripping or stop
mechanisms, feeding and ejecting mechanisms for power presses, and more.

 

[Nigel Cook]

"Nigel Cook" <diverse2@tcp.co.antispam.uk> wrote in message
news:v-mdndz1xoyB4xCiU-KYkA@tcp.co.uk...

Am wrestling with a 5 CD shuffle mechanism on a Panasonic SA CH 74
Does anyone know of a general resource for mechanical problems wth
variants
of these beasts ?
This one has 5 separate platters to hold each CD.
On entry the CD sldes along the bottom ,is elevated by the laser + spinner
assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated
position and the main slide mchanism returns the carrier to the top of the
stack of 5 after playing.
Anyway something ,undiagnosed ,causes the top level transfer to stick part
across ,cannot see what ,
with all the mechanism in active position. As a fall-back ,disabling the
pawls and associated high level slideway the carrier will move in and out
at
low level for single CD operation without jams.
Unfortunately a flimsey microswitch monitors carrier across the top and i
won't know what effect non-switching of this micro will have until i
rerassemble it all.
Marvelous array of mechanisms all coming off the one motor drive or it
would
be
if it worked. What sort of mind designs these mechanisms, rotary,rack and
pinion, latches, slideways,reciprocating motions

e-mail (removing .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England


For the archives - problem solved.

Why will owners not admit they wrenched things to retrieve CDs
and tapes. They must think we will penalise them in repair charge for there
ignorance ,wheras in fact honesty should help us zero in on the problem
quicker. We've
seen it all before but sometimes like this case it is not immediately
obvious.
Retrieved a diplaced torsion spring from
elesewhere in the casing. This biased a latch that engaged / disengaged at
the point where CD platter sliding along base changes to vertical movement o
f the laser + spinner and carrier.
It looks as though a physically large but not strong torsion spring ,now
missing, used to be at the
centre of a long lever and quadrant cog that drives a lead screw to push a
lifter of all the stacked CDs.
Could not make sense of this spring as to function properly seems to be the
reverse action to what the anchor hooks would suggest.
Finally under the front edge of the CD carrier slideway is a little passive
latch that holds/releases
the bottom-most carrier relative to the slideway. This ,not obviously as
covered,was out of alignment because the central plastic pin was broken-
replaced with glued in nylon bolt after drilling a hole.

 

[Brad]

hi
i have the same problem, with mine, is their any way to fix this i don't
know much about it but im sure if you gave me some instructions i would be
able to play and fix it.


"Nigel Cook" <diverse2@tcp.co.antispam.uk> wrote in message
news:yd6dnc-b0tEUUhOiXTWJig@tcp.co.uk...

"Nigel Cook" <diverse2@tcp.co.antispam.uk> wrote in message
news:v-mdndz1xoyB4xCiU-KYkA@tcp.co.uk...
Am wrestling with a 5 CD shuffle mechanism on a Panasonic SA CH 74
Does anyone know of a general resource for mechanical problems wth
variants
of these beasts ?
This one has 5 separate platters to hold each CD.
On entry the CD sldes along the bottom ,is elevated by the laser +
spinner
assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated
position and the main slide mchanism returns the carrier to the top of
the
stack of 5 after playing.
Anyway something ,undiagnosed ,causes the top level transfer to stick
part
across ,cannot see what ,
with all the mechanism in active position. As a fall-back ,disabling the
pawls and associated high level slideway the carrier will move in and
out
at
low level for single CD operation without jams.
Unfortunately a flimsey microswitch monitors carrier across the top and
i
won't know what effect non-switching of this micro will have until i
rerassemble it all.
Marvelous array of mechanisms all coming off the one motor drive or it
would
be
if it worked. What sort of mind designs these mechanisms, rotary,rack
and
pinion, latches, slideways,reciprocating motions

e-mail (removing .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse

Nigel,Diverse Devices,Southampton,England


For the archives - problem solved.
Why will owners not admit they wrenched things to retrieve CDs
and tapes. They must think we will penalise them in repair charge for
there
ignorance ,wheras in fact honesty should help us zero in on the problem
quicker. We've
seen it all before but sometimes like this case it is not immediately
obvious.
Retrieved a diplaced torsion spring from
elesewhere in the casing. This biased a latch that engaged / disengaged at
the point where CD platter sliding along base changes to vertical movement
o
f the laser + spinner and carrier.
It looks as though a physically large but not strong torsion spring ,now
missing, used to be at the
centre of a long lever and quadrant cog that drives a lead screw to push a
lifter of all the stacked CDs.
Could not make sense of this spring as to function properly seems to be
the
reverse action to what the anchor hooks would suggest.
Finally under the front edge of the CD carrier slideway is a little
passive
latch that holds/releases
the bottom-most carrier relative to the slideway. This ,not obviously as
covered,was out of alignment because the central plastic pin was broken-
replaced with glued in nylon bolt after drilling a hole.

 

[Nigel Cook]

"Brad" <goddab1@iprimus.com.au> wrote in message
news:3f90f7e4_1@news.iprimus.com.au...

hi
i have the same problem, with mine, is their any way to fix this i don't
know much about it but im sure if you gave me some instructions i would be
able to play and fix it.

This is how the write-up will appear on repair file when i next

ftp to URL below

Panasonic SA CH 74,compact hi-fi 1996
Broken mic plug stuck in socket,jammed CD mechanism
Mark orientation of all removable ribbon cables before
separating - foil type push and pull,wire type raise the surround
before pulling on the cable. Pull front panel away from main body,
2 indirect connectors under the vol control.
To get to mic socket ,remove 2 knobs ,remove display
pannel then multi-switch pannel. Desolder socket ,drill small hole
on underside and push remnant of plug back.

This one has 5 separate platters to hold each CD.
On entry the CD sldes along the bottom ,is elevated by the laser + spinner
assembly and 4 flimsy 'ratchet' pawls hold the carrier in the elevated
position and the main slide mchanism returns the carrier to the top of the
stack of 5 after playing or along bottom to release/change through front.
As a fall-back ,disabling the
pawls and associated high level slideway the carrier will move in and out at
low level for single CD operation without jams.
Unfortunately a flimsey microswitch monitors carrier across the top and i
won't know what effect non-switching of this micro will have until i
rerassemble it all.
Marvellous array of mechanisms all coming off the one motor drive .
What sort of mind designs these mechanisms, rotary,rack and
pinion, latches, compound slideways,translating and reciprocating motions?
[ for anyone involved with this sort of thing or automata then
this book may be interesting
Ingenious Mechanisms for Designers and Inventors
Volume I: Franklin D. Jones; 1930, 536 pp, illustrated, ISBN 0-8311-1029-5 ]

Retrieved a displaced torsion spring from
elesewhere in the casing. This biased a latch (at the rear) that engaged /
disengaged at
the point where CD carrier sliding along base changes to vertical movement
of
the laser + spinner and carrier.
It looks as though a physically large but not strong torsion spring ,now
missing, used to be at the
centre of a long lever and quadrant cog that drives a lead screw to push a
lifter of all the stacked CDs.
Could not make sense of this spring, as to function properly ,seems to be
the
reverse action to what the anchor hooks would suggest.
Finally under the front edge of the CD carrier slideway is a little passive
latch that holds/releases
the bottom-most carrier relative to the slideway. Fingernails pushed behind
this
cover and forced up and out will release it.
This latch ,not obviously as
covered,was out of alignment because the central plastic pin was broken-
replaced with glued in nylon bolt after drilling a hole . Broken pedastal
type of microswitch monitoring slideway limits.
For these 2 uswitches with CD drawer out both are s/c,
in between sw1 s/c and sw2 o/c. Drawer in both o/c.
2 uswitches monitoring laser carrier movement in play
sw2 &sw3 s/c ,in between sw3 o/c,sw2 s/c
at bottom position sw2 & sw3 o/c.
Top slideway microswitch n/o
Drawer motor 3 to 4 V for external powering or
remove rubber band and turn large cogs by finger.
On reassembly intermittently powered down showing
error F61 or FG1 ,probably dodgy ribbon connections as
remade all and ok after that.

e-mail (removing .....) diverse2@tcp.co.u.....k
electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse/repair.htm

Nigel,Diverse Devices,Southampton,England