What control signal to the main CD micro would disable spinner drive.
Taking the I/P H(ish) of the releavant 1/4 of the BA6398 quad motor driver
gets the motor spinning.
Taking the I/P L(ish) of the isolated inv buffer on the BA6398 also fires it
up.
The signal line to this buffer from pin 25 of the CXD2503 main micro is not
going negative of mid V neutral.
Focus/tracker coils hunt and sled motor moves on power up but no spinner.
Both limit switches function


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

misreading error CXD2508 AQ

"n cook" writes:

What control signal to the main CD micro would disable spinner drive.
Taking the I/P H(ish) of the releavant 1/4 of the BA6398 quad motor driver
gets the motor spinning.
Taking the I/P L(ish) of the isolated inv buffer on the BA6398 also fires it
up.
The signal line to this buffer from pin 25 of the CXD2503 main micro is not
going negative of mid V neutral.
Focus/tracker coils hunt and sled motor moves on power up but no spinner.
Both limit switches function

Component CD players won't spin the disc if there is no focus lock due
to dirt, weak or dead laser, etc. If the focus coil hunts but doesn't
stop, there may be no motor drive.

See the CD player repair guid.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

"n cook" wrote in message
...
What control signal to the main CD micro would disable spinner drive.
Taking the I/P H(ish) of the releavant 1/4 of the BA6398 quad motor driver
gets the motor spinning.
Taking the I/P L(ish) of the isolated inv buffer on the BA6398 also fires
it
up.
The signal line to this buffer from pin 25 of the CXD2503 main micro is
not
going negative of mid V neutral.
Focus/tracker coils hunt and sled motor moves on power up but no spinner.
Both limit switches function


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/


Sam is right. Typically it will make 3 attempts for focus lock. If no lock,
no spinning. I used to use the little Radio Shack remote control tester
cards to see if there is any light coming out of the laser. But usually if
it tries three times and quits you can replace the optics assembly. Scott

Sam Goldwasser wrote in message
...
"n cook" writes:

What control signal to the main CD micro would disable spinner drive.
Taking the I/P H(ish) of the releavant 1/4 of the BA6398 quad motor
driver
gets the motor spinning.
Taking the I/P L(ish) of the isolated inv buffer on the BA6398 also
fires it
up.
The signal line to this buffer from pin 25 of the CXD2503 main micro is
not
going negative of mid V neutral.
Focus/tracker coils hunt and sled motor moves on power up but no
spinner.
Both limit switches function

Component CD players won't spin the disc if there is no focus lock due
to dirt, weak or dead laser, etc. If the focus coil hunts but doesn't
stop, there may be no motor drive.

See the CD player repair guid.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above
is
ignored unless my full name AND either lasers or electronics is included
in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

I'd never realised there was a focus check before trying to spin up/ extract
any data from CDs.
I looked in a troubleshoot manual for a different make and model
and flow chart is
Does disc rotate - N
Does pick up move - Y
Is laser lit - Y
Is there sound if disc rotated by hand - N -Go to focus section

Not looked at further but flow chart continued

Focus section
Does pulse waveform appear at FCSI on processor - N - processor defective
Does pulse waveform appear at FCSI on processor - Y - Is Ramp waveform at
FEO of

focus&tracking IC - N - is there a ramp waveform at FSO
focus&tracking IC - Y - check motor/coil driver IC


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

"n cook" writes:

Sam Goldwasser wrote in message
...
"n cook" writes:

What control signal to the main CD micro would disable spinner drive.
Taking the I/P H(ish) of the releavant 1/4 of the BA6398 quad motor
driver
gets the motor spinning.
Taking the I/P L(ish) of the isolated inv buffer on the BA6398 also
fires it
up.
The signal line to this buffer from pin 25 of the CXD2503 main micro is
not
going negative of mid V neutral.
Focus/tracker coils hunt and sled motor moves on power up but no
spinner.
Both limit switches function

Component CD players won't spin the disc if there is no focus lock due
to dirt, weak or dead laser, etc. If the focus coil hunts but doesn't
stop, there may be no motor drive.

See the CD player repair guid.

I'd never realised there was a focus check before trying to spin up/ extract
any data from CDs.
I looked in a troubleshoot manual for a different make and model
and flow chart is
Does disc rotate - N
Does pick up move - Y
Is laser lit - Y
Is there sound if disc rotated by hand - N -Go to focus section

Right, so I think it's saying that the disc isn't rotating because
there is no focus.

Not looked at further but flow chart continued

Focus section
Does pulse waveform appear at FCSI on processor - N - processor defective
Does pulse waveform appear at FCSI on processor - Y - Is Ramp waveform at
FEO of

focus&tracking IC - N - is there a ramp waveform at FSO
focus&tracking IC - Y - check motor/coil driver IC

This is asying that it's issuing the commands try to focus but the voice
coil isn't doing anything.

Focus before spin isn't universal - portables may not wait, but people should
resist the temptation to immediately blame a coil driver or coil if the disc
doesn't spin.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.