KLH model KD-1220 DVD Player, Disc Tray will not stay open

Hi,

I have a KLH model KD-1220 DVD player. The disc tray will not stay
open. Note: I was in consumer electronics service for many years.

The only way I can insert a disc or remove it, is by turning off the main
power switch on the front panel right after the tray is fully open.

I searched the web, but there were no solutions for this specific
problem.

Did anyone have this exact problem and repaired it?

Thank You in advance, John

 

[Pat]

On Tue, 06 Nov 2012 10:54:57 -0500, jaugustine@verizon.net wrote:

Hi,

I have a KLH model KD-1220 DVD player. The disc tray will not stay
open. Note: I was in consumer electronics service for many years.

The only way I can insert a disc or remove it, is by turning off the main
power switch on the front panel right after the tray is fully open.

I searched the web, but there were no solutions for this specific
problem.

Did anyone have this exact problem and repaired it?

Thank You in advance, John

I am not familiar with that model, but most units have a switch that

senses when someone pushes on the tray and then activates the closing
action. Could that switch be out of alignment or broken? Just a
guess.

Pat

 

[Cydrome Leader]

jaugustine@verizon.net wrote:

Hi,

I have a KLH model KD-1220 DVD player. The disc tray will not stay
open. Note: I was in consumer electronics service for many years.

The only way I can insert a disc or remove it, is by turning off the main
power switch on the front panel right after the tray is fully open.

I searched the web, but there were no solutions for this specific
problem.

Did anyone have this exact problem and repaired it?

Thank You in advance, John

there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

 

On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you wrote:
<SNIP>

there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

One thing I forgot to say, I do NOT have a service manual for
this unit.

Revised Question:

Did anyone have this exact same problem with this same brand and model DVD
player and repaired it?

Thank You in advance, John

 

[Ken]

jaugustine@verizon.net wrote:

On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

I read your original post, and I too did not deduct from it that you
were a consumer electronics wiz. If you had been, I thought you would
have mentioned that you had checked any switches involved in the tray
operation. I think you might be better off taking a deep breath and
saying you had checked such items, rather than criticizing someone who
was trying to help you.

One thing I forgot to say, I do NOT have a service manual for
this unit.

Revised Question:

Did anyone have this exact same problem with this same brand and model DVD
player and repaired it?

Thank You in advance, John

 

[N_Cook]

<jaugustine@verizon.net> wrote in message
news:kqmk98lpov0c9i17ner9jkihhk91k06g6d@4ax.com...

On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you
wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of
my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

One thing I forgot to say, I do NOT have a service manual for
this unit.

Revised Question:

Did anyone have this exact same problem with this same brand and model
DVD
player and repaired it?

Thank You in advance, John

Is the tray opening part of a single combined cam system with dropping disc
from play position , and the reverse, tray in and disc up ?
And something slipped out of kilter in the drive train

 

[Cydrome Leader]

jaugustine@verizon.net wrote:

On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

I first noticed you can't solve a door tray issue, then I noticed you
listed no previous troubleshooting steps.

 

[Arfa Daily]

<jaugustine@verizon.net> wrote in message
news:kqmk98lpov0c9i17ner9jkihhk91k06g6d@4ax.com...

On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you
wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

Well, pardon us for trying to help. What you describe is a very common
problem with all CD/DVD mechs, and I can't remember ever fixing one of any
make or model that wasn't down to a dirty sense switch somewhere in the
mech. Maybe you just weren't looking in the right place ?

One thing I forgot to say, I do NOT have a service manual for
this unit.

Then perhaps you need one ...

Arfa

 

On Wed, 07 Nov 2012 07:58:06 -0600, in sci.electronics.repair you wrote:

<SNIP>

I read your original post, and I too did not deduct from it that you
were a consumer electronics wiz. If you had been, I thought you would
have mentioned that you had checked any switches involved in the tray
operation. I think you might be better off taking a deep breath and
saying you had checked such items, rather than criticizing someone who
was trying to help you.

Hi Ken,

I am sorry I did not mention that I looked for such a switch in my
original post.

If there is a "switch", it is in a hidden location since I did not
disassemble the tray from the rest. Note: I opened the tray all the
way, then pulled the plug in my search for a switch.

If I had a SM, I would know what method is used to determine the tray
status.
John

 

[Cydrome Leader]

N_Cook <diverse@tcp.co.uk> wrote:

jaugustine@verizon.net> wrote in message
news:kqmk98lpov0c9i17ner9jkihhk91k06g6d@4ax.com...
On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you
wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part of
my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

One thing I forgot to say, I do NOT have a service manual for
this unit.

Revised Question:

Did anyone have this exact same problem with this same brand and model
DVD
player and repaired it?

Thank You in advance, John




Is the tray opening part of a single combined cam system with dropping disc
from play position , and the reverse, tray in and disc up ?
And something slipped out of kilter in the drive train

This sounds like something worth looking into. I've had to remove gears
and reset the position of computer CDROM trays before. If you bang the
tray too hard, the teeth can slip, confusing the heck out of the unit.

 

[Dav.p]

Hi, i'll try to write in english..

some times i've heard about this problem, i know on cdrom readers there is
a lever type switch with the lever pushed in one side when tray opens and the
other when it closes, if when the user commands to open, the tray reaches
the end of the run the board (i think) senses motor's too much current use and
revert the direction, i think the switch is a single contact but in some way
when the tray closes there is no invertion or maybe the switch has 3 contacts
but 2 are common so the "close" contact works, the "open" not..
this sw. is on one side of the tray, if you watch under the bottom side is made
like __/'''''''''''''''''''''''''''\___ this... it is on the front, i think.
i've been clear?

Bye..

 

[N_Cook]

Cydrome Leader <presence@MUNGEpanix.com> wrote in message
news:k7jee4$crq$2@reader1.panix.com...

N_Cook <diverse@tcp.co.uk> wrote:
jaugustine@verizon.net> wrote in message
news:kqmk98lpov0c9i17ner9jkihhk91k06g6d@4ax.com...
On Tue, 6 Nov 2012 23:31:14 +0000 (UTC), in sci.electronics.repair you
wrote:
SNIP
there is generally a crappy leaf type switch to sense with the door is
open. try burnishing it with some paper.

does the unit open all the way, then pause and close or just close
instantly? It may have no idea when it reached end of travel.

Hi,

The tray opens all the way, then immediately closes.

Regarding the leaf switch or other type, did you notice this part
of
my
post: " Note: I was in consumer electronics service for many years."
Don't you think I looked for such a switch?

One thing I forgot to say, I do NOT have a service manual for
this unit.

Revised Question:

Did anyone have this exact same problem with this same brand and
model
DVD
player and repaired it?

Thank You in advance, John




Is the tray opening part of a single combined cam system with dropping
disc
from play position , and the reverse, tray in and disc up ?
And something slipped out of kilter in the drive train

This sounds like something worth looking into. I've had to remove gears
and reset the position of computer CDROM trays before. If you bang the
tray too hard, the teeth can slip, confusing the heck out of the unit.

Or due to kids or drunks trying to force open the tray

 

[Arfa Daily]

<jaugustine@verizon.net> wrote in message
news:aobn98l370r0m3aub8dgij2gj0g15j70k7@4ax.com...

On Wed, 07 Nov 2012 07:58:06 -0600, in sci.electronics.repair you wrote:

SNIP

I read your original post, and I too did not deduct from it that you
were a consumer electronics wiz. If you had been, I thought you would
have mentioned that you had checked any switches involved in the tray
operation. I think you might be better off taking a deep breath and
saying you had checked such items, rather than criticizing someone who
was trying to help you.

Hi Ken,

I am sorry I did not mention that I looked for such a switch in my
original post.

If there is a "switch", it is in a hidden location since I did not
disassemble the tray from the rest. Note: I opened the tray all the
way, then pulled the plug in my search for a switch.

If I had a SM, I would know what method is used to determine the tray
status.
John

The reason that this problem happens, is that although we all know that
pushing on the tray to close it is a bad idea, manufacturers know that
punters are gonna do it. So they arrange for the micro to look at the 'tray
open' switch from two points of view. First, they check if the switch
contacts close whilst the tray motor is running. When that is true, the tray
is open, and the power to the motor is cut. The switch is then monitored for
it going open when the motor is not running. When that is true, the motor is
run in reverse to close the tray. This allows the tray to be pushed to the
point of the switch re-opening, before the motor takes over and finishes the
job. This sequence can of course be over-ridden by the open / close button
being pressed. This takes priority over the 'motor stopped - tray switch
closed' condition that prevailed at the end of the opening sequence.

The problems start when the contacts on the 'tray open' switch get sooty, as
they frequently do. So the tray opens, the switch closes, the motor stops,
and then the switch momentarily opens again, even though it is firmly
mechanically pressed, due to the sooty contacts not making very well. This
is immediately seen as the tray having been pushed by the owner, so the
system control micro starts to run the motor in reverse. This all happens so
quickly that what you get is effectively the tray fully opening, and
immediately 'bouncing' back closed.

Although over the years I have come across the odd exception to the
mechanical switch scheme, it is by far and away the most commonly used tray
management system from all manufacturers, Usually, the switch is an easily
visible leaf contact type, mounted somewhere near the front of the deck, but
on some mechs, it can be located in much harder to see places. Also, some
mechs use miniature plunger switches in all sorts of obscure locations, and
still others use either of those switch types, but mounted to the side of -
or even under - a mechanical 'cam' that's part of the tray open / close -
disc clamping arrangement.

Arfa

 

On Tue, 06 Nov 2012 10:54:57 -0500, in sci.electronics.repair you wrote:

<SNIP>

Hi,
UPDATE:

Well I was wrong. There is a switch, but it is tiny on the left side.
You can not see it unless the tray is all the way out. Before, when I
pulled the plug, I guess the tray was not all the way our. Note: This
is not a leaf type switch but more like a "micro switch", and very small.

Thanks to everyone for your responses.

John

 

[Arfa Daily]

<jaugustine@verizon.net> wrote in message
news:i8h4a8pddf8mrkupadrf3h9k05p4unl8ns@4ax.com...

On Tue, 06 Nov 2012 10:54:57 -0500, in sci.electronics.repair you wrote:

SNIP

Hi,
UPDATE:

Well I was wrong. There is a switch, but it is tiny on the left side.
You can not see it unless the tray is all the way out. Before, when I
pulled the plug, I guess the tray was not all the way our. Note: This
is not a leaf type switch but more like a "micro switch", and very small.

Rather like I suggested might be the case, then ...

Arfa

Thanks to everyone for your responses.

John