March 3, at 8: Unfortunately, I cannot tell you which potentiometer does what — they could be power, focus, tilt or something else altogether. I was sure that the laser is working because I was seeing the red laser light not directly, of course: Now you will be greeted with the main guts:. Well first, turn them over and undo the four screws that secure the base-plate to the contraption.
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And in liteon lh-18a1p end I have a working drive again. Liteon lh-18a1p were my drives of choice when it came to testing. Use the paperclip to emergency-eject the tray, unclip the front bezel from the tray, then the body, and you should be left with the following:.
An Obiturary: LiteOn SOHW-1633S, and LH-18A1P
The whole sled including the disc spindle motor is mounted on a liteon lh-18a1p metal frame which is secured to the plastic frame of the drive using anti-vibration silicone grommets — this reduces noise and vibration transfer to the case, but also ensures that the sled and spindle all vibrate in harmony with the disc to maintain good tracking at high speeds.
How to open these drives? One interesting thing is that the laser pickups have QR codes on them — disassembling both drives liteon lh-18a1p scanning their pickups gives us the following photo:. You will see the left is the front panel loader, and liteon lh-18a1p normally contains a tray motor, some gears, a few buttons, a position encoder, headphone socket, potentiometer and liteon lh-18a1p LED. The data from the left one is 0.
The other potentiometer worked the same, but for reading DVDs. The little chip near the power supply bypass caps is the EEPROM which contains unique calibration data for the actual drives.
LiteOn LHA1P vGL03 Writing Quality
I have been able to fix the non-reading issue liteon lh-18a1p my drive. The LiteOn drives were extremely flexible, firmware lh-18q1p, in terms of read-speed and write speed hacks, strategy re-labelling and swapping through Omnipatcher because of the big community that had built around guys at CD Freaks which included employees of LiteOn themselves.
With that liteon lh-18a1p diagnosis, I take a moment to salute these fine drives, and send them onto their way towards the garbage.
I have to emphasize that the tweaking was done in very small steps. I was sure that the laser is working because I was seeing the red laser light not directly, of course: I fixed the drive by tweaking the two potentiometers: March 3, at 8: Unfortunately, I cannot tell you which potentiometer does what — they could be power, focus, tilt or something else altogether. Directly in the middle of the photo is the lens and the main pickup assembly which contains liteon lh-18a1p lasers and photodiodes which read liteon lh-18a1p write your data.
The main SOC is just peeking out from above the top of the flexi-ribbon. Liteon lh-18a1p 3, at I figured out that if I turn one potentiometer clockwise, the drive stops reading CDs; if I turn it counter-clockwise, it reads CDs again.
Lite-on LH-18A1P Firmware GL0F
This allowed us to gain speed, free of charge, courtesy of a few bit-twiddles. Thanks for any help! This is connected liteon lh-18a1p a wide ribbon to the mainboard below.
Click for more about me! You will also see the flash chip with the firmware, covered with a label that has the initial firmware revision the drive shipped with — BS The LiteOn benefits extended further, including a well-documented way to reset the RPC region control lockout settings, kiteon ways to flash back to RPC-1 if necessary. This is the underside of the drive.
I will sorely liteon lh-18a1p these drives, but that being said, laser failure seemed to be a common trait amongst liteon lh-18a1p LiteOn drives — the fact mine have lived such long and productive lives is something to marvel at on its own. While doing testing for the Milleniata post, I discovered that my two trusty quality test workhorses were dead. The liteon lh-18a1p itself is mounted on smooth rails, driven by a stepper motor which is mounted below the sled.
This entry was posted in ComputingObituary and tagged computer hardware liteon lh-18a1p, deadoptical disc. Remove liteoon base plate. You will need liteon lh-18a1p depress both clips, and lever off the lid to see the innards.