Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default DVD Drive motor power

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.
The DVD motor does not spin.
. . I did cut one wire on the DVD drive motor...it showed resistance. Just
to be sure
(cheapo multimeter) I ran 5 vdc (from a model RY controller) and the motor
spun with no problems...
.. . . The motor gets it power from a small board. This is a mount for a 2
wire N.O. switch feeding the drive motor? The switch is activated by the
optical sensor moving to the front and pushing a lever on the switch. This
switch board is not getting power from the optical board which in turn is
connected to a daughterboard above the main motherboard. The llaser is lit
and the optical drive motor is working on the optical frame. The disc door
works ok.
.. . . .I pulled and re-inserted the two small ribbon cables (between the
daugherboard and the optical frame) a few times, just to make sure no
corosion was in the contacts and
that did not help. I would imagine the narrowest ribbon cable is the
power/control feed, and the widest one is the data cable. The laser tracking
slide moves ok and the laser is illuminated. The spinner frane elevates and
depresses ok. Everything seems to be working fine except the DVD motor is
not getting power.
.. . . I am sure my friend would appreciate this one having its DVD working
as it also plays mp3's
.. . . .in advance. . .thanks
.. . . . . .charlie.





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Default DVD Drive motor power

responding to
http://www.electrondepot.com/repair/...er-136411-.htm
DA wrote:
Chas wrote:

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.
The DVD motor does not spin.
. . I did cut one wire on the DVD drive motor...it showed resistance.
Just
to be sure
(cheapo multimeter) I ran 5 vdc (from a model RY controller) and the
motor
spun with no problems...


DVD spindle motors are usually brushless DC (BLDC) motors that would not
work by just powering them with DC - you'd need a driver IC that creates
the proper waveforms. So, my guess is that this deck has just a simple DC
motor instead? Otherwise the 5VDC trick wouldn't work. How many wires are
coming out of that motor?



The laser tracking
slide moves ok and the laser is illuminated. The spinner frane elevates
and depresses ok. Everything seems to be working fine except the DVD motor
is not getting power.


I'm not familiar with the particular model but in those DVD drives I've
seen insides of, all motors (and also any solenoids) are driven by the
same IC. ROHM's BA5995FM would be one example (or others in BA68xx
series). It's a 28-leads HSOP28-M package (with a thick grounding/heat
sink solderable connector plate in a middle) that requires very little
extra components. In other words, if the motor does not spin and the motor
itself is OK, it's either the IC or the Hall-effect sensors (or whatever
other sensors there may be in the speed control feedback) - either way the
repair is very tricky because the faulty parts are the least serviceable.

I don't want to suggest it's necessarily your case but you may want to
look around for a 28+ pin driver IC that may be connected to the motor.
Then work your way from the motor (the best serviceable) down to the IC
(the least serviceable)

Post more info about the motor, I may be able to help more if it's type is
known.

Good luck!
-------------------------------------
/_/
((@v@))
()::)
VV-VV



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Default DVD Drive motor power

"Chas" wrote in message
...
Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.
The DVD motor does not spin.
. . I did cut one wire on the DVD drive motor...it showed resistance.
Just to be sure
(cheapo multimeter) I ran 5 vdc (from a model RY controller) and the
motor
spun with no problems...
. . . The motor gets it power from a small board. This is a mount for a 2
wire N.O. switch feeding the drive motor? The switch is activated by the
optical sensor moving to the front and pushing a lever on the switch. This
switch board is not getting power from the optical board which in turn is
connected to a daughterboard above the main motherboard. The llaser is lit
and the optical drive motor is working on the optical frame. The disc
door works ok.
. . . .I pulled and re-inserted the two small ribbon cables (between the
daugherboard and the optical frame) a few times, just to make sure no
corosion was in the contacts and
that did not help. I would imagine the narrowest ribbon cable is the
power/control feed, and the widest one is the data cable. The laser
tracking
slide moves ok and the laser is illuminated. The spinner frane elevates
and depresses ok. Everything seems to be working fine except the DVD
motor is not getting power.
. . . I am sure my friend would appreciate this one having its DVD working
as it also plays mp3's
. . . .in advance. . .thanks
. . . . . .charlie.







Bad laser pickups are quite common. Probably a waste of time.

Sorry.

Mark Z.

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Default DVD Drive motor power

On Dec 20, 7:49*am, DA wrote:
responding tohttp://www.electrondepot.com/repair/dvd-drive-motor-power-136411-.htm

DA wrote:
Chas *wrote:
Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.
The DVD motor does not spin.
*. . I did cut one wire on the DVD drive motor...it showed resistance..
Just
to be sure
(cheapo multimeter) *I ran 5 vdc (from a model RY controller) and the
motor
spun with no problems...


DVD spindle motors are usually brushless DC (BLDC) motors that would not
work by just powering them with DC - you'd need a driver IC that creates
the proper waveforms. So, my guess is that this deck has just a simple DC
motor instead? Otherwise the 5VDC trick wouldn't work. How many wires are
coming out of that motor?

The laser tracking
slide moves ok and the laser is illuminated. The spinner frane elevates
and depresses ok. *Everything seems to be working fine except the DVD motor
is not getting power.


I'm not familiar with the particular model but in those DVD drives I've
seen insides of, all motors (and also any solenoids) are driven by the
same IC. ROHM's BA5995FM would be one example (or others in BA68xx
series). It's a 28-leads HSOP28-M package (with a thick grounding/heat
sink solderable connector plate in a middle) that requires very little
extra components. In other words, if the motor does not spin and the motor
itself is OK, it's either the IC or the Hall-effect sensors (or whatever
other sensors there may be in the speed control feedback) - either way the
repair is very tricky because the faulty parts are the least serviceable.

I don't want to suggest it's necessarily your case but you may want to
look around for a 28+ pin driver IC that may be connected to the motor.
Then work your way from the motor (the best serviceable) down to the IC
(the least serviceable)

Post more info about the motor, I may be able to help more if it's type is
known.

Good luck!
-------------------------------------
*/_/
((@v@))
()::)
*VV-VV


If the dc motor is not turning,I will advise you to remove the motor
from the deck power it with external voltage source for about 4 to 5
minutes and return it.This is called dc excitation ,because, I believe
the magnets inside the dc motor are loosing their magnetic
properties .Hope this finds you well.If I may like to ask ,did you
measure the output voltage where the dc motor is connected?
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Default DVD Drive motor power

On Mon, 19 Dec 2011 19:30:09 -0700, "Chas"
put finger to keyboard and composed:

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.


Service manual:
http://elektrotanya.com/goldstar_gbv.../download.html
http://elektrotanya.com/lg_gbv441.pdf/download.html

User manual:
http://support.radioshack.com/manuals/ome16-3904.pdf
http://support.radioshack.com/produc...erDisc&Reuse=N

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


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Default DVD Drive motor power



"DA" wrote in message
roups.com...
responding to
http://www.electrondepot.com/repair/...er-136411-.htm
DA wrote:
Chas wrote:

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.
The DVD motor does not spin.
. . I did cut one wire on the DVD drive motor...it showed resistance.
Just
to be sure
(cheapo multimeter) I ran 5 vdc (from a model RY controller) and the
motor
spun with no problems...


DVD spindle motors are usually brushless DC (BLDC) motors that would not
work by just powering them with DC - you'd need a driver IC that creates
the proper waveforms. So, my guess is that this deck has just a simple DC
motor instead? Otherwise the 5VDC trick wouldn't work. How many wires are
coming out of that motor?



Actually, most bog-standard DVD decks found in domestic players, *do* employ
a Mitsumi DC motor of exactly the same variety as found on CD decks. They
frequently fail, but not totally. They are usually just reluctant to start
up, and if you give them a bit of help, they will spin up the disc and
operate normally until next time. Occasionally, the symptom is of slow
rotation. The fact that the motor appears not to be being driven, may be a
secondary symptom of the real fault. It depends on what startup sequence
this particular player uses. Some will run the disc up right away, and then
go looking for output from the optical block. Some will attempt to obtain
focus first, and if they can't, will rotate the disc in small pulses, to see
if they can find an area where they can obtain focus, just in case the first
area tried was dirty, or badly damaged. But some will only try to obtain
focus in one place. If that doesn't happen, perhaps because the laser is
defective, the coarse spindle drive and servo will never be enabled, and
power will never be applied to the motor.

The motor will be driven by (often) a small SIP IC, but sometimes by a
somewhat larger IC, that looks after the sled motor as well. The switch on
the small board that the motor is primarily connected to, is nothing to do
with control of the motor. It is the laser 'home' switch. The board is just
a convenient 'via here' point to anchor the motor's wires to. Rarely, the
drive IC is actually on this little board, but mostly, it will be found down
on the board that the little switch board connects to. Normally, you will
find either a cable with half a dozen wires in it, going between the switch
board and the main board, or sometimes, a flexiprint (not to be confused
with the flexi from the laser). This cable also carries drive for the sled
motor. If you look close to where that cable arrives at the main board, you
will probably find the drive IC (s). You can check that there is some
voltage present on the supply pins of the chip. Typically, this will be
around 8 volts. If there is voltage present, but nothing is output to the
motor, then you will probably not progress much further without schematics,
and a degree of experience in troubleshooting the servo / drive circuitry.
As a slight aside, if you deliberately move the sled some distance up the
slides, then apply power, and the sled motor runs to return it 'home', as I
believe you stated was the case, then the supply for the spindle motor
driver is almost certainly present, as sled and spindle drives usually share
a common supply. As another quick test, does it play a CD still ?



Arfa

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Default DVD Drive motor power



"Franc Zabkar" wrote in message
news
On Mon, 19 Dec 2011 19:30:09 -0700, "Chas"
put finger to keyboard and composed:

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.


Service manual:
http://elektrotanya.com/goldstar_gbv.../download.html
http://elektrotanya.com/lg_gbv441.pdf/download.html

User manual:
http://support.radioshack.com/manuals/ome16-3904.pdf
http://support.radioshack.com/produc...erDisc&Reuse=N

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Hey Franc. Where's the actual download link on that page ? Every time I go
looking for a manual online, I keep fetching up at that site, but I never
seem to be able to find the download link to the actual pdf. Everything that
you can click on seems to be either a Google ad, or some ancillary program
download. I'm probably being blind and dumb. Put a dopey old sod out of his
misery, will you ? :-)

Arfa

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Default DVD Drive motor power

On Thu, 22 Dec 2011 01:42:28 -0000, "Arfa Daily"
put finger to keyboard and composed:



"Franc Zabkar" wrote in message
news
On Mon, 19 Dec 2011 19:30:09 -0700, "Chas"
put finger to keyboard and composed:

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.


Service manual:
http://elektrotanya.com/goldstar_gbv.../download.html
http://elektrotanya.com/lg_gbv441.pdf/download.html

User manual:
http://support.radioshack.com/manuals/ome16-3904.pdf
http://support.radioshack.com/produc...erDisc&Reuse=N

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Hey Franc. Where's the actual download link on that page ? Every time I go
looking for a manual online, I keep fetching up at that site, but I never
seem to be able to find the download link to the actual pdf. Everything that
you can click on seems to be either a Google ad, or some ancillary program
download. I'm probably being blind and dumb. Put a dopey old sod out of his
misery, will you ? :-)

Arfa


There is a "Get Manual" link about two thirds of the way down the
page, just to the right of centre.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
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Default DVD Drive motor power



"Franc Zabkar" wrote in message
...
On Thu, 22 Dec 2011 01:42:28 -0000, "Arfa Daily"
put finger to keyboard and composed:



"Franc Zabkar" wrote in message
news
On Mon, 19 Dec 2011 19:30:09 -0700, "Chas"
put finger to keyboard and composed:

Working on a friends Goldstar GBV441 DVD/RW/CD/RW-VHS/RW unit.

Service manual:
http://elektrotanya.com/goldstar_gbv.../download.html
http://elektrotanya.com/lg_gbv441.pdf/download.html

User manual:
http://support.radioshack.com/manuals/ome16-3904.pdf
http://support.radioshack.com/produc...erDisc&Reuse=N

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.


Hey Franc. Where's the actual download link on that page ? Every time I go
looking for a manual online, I keep fetching up at that site, but I never
seem to be able to find the download link to the actual pdf. Everything
that
you can click on seems to be either a Google ad, or some ancillary program
download. I'm probably being blind and dumb. Put a dopey old sod out of
his
misery, will you ? :-)

Arfa


There is a "Get Manual" link about two thirds of the way down the
page, just to the right of centre.

- Franc Zabkar
--



Damn ! How did I miss that ? Well, I guess because of all the big brightly
coloured 'download' buttons, that are in fact just ads or ancillary programs
that you don't want ...

Anyways, the manual tells all with flow diagrams for the DVD section and
trouble shooting guides. It looks as though it is a two channel driver IC
for spindle and sled motors, and it looks as though it requires several
servo on signals to be present, before it outputs motor drive, as I
suspected might be the case.

Arfa

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