Drive gear for Sharp CD mech

[Franc Zabkar]

I need the drive gear for the sled motor for a Sharp H8134AF laser
assembly out of a GX-CD555Z(GY) portable 3-in-1 unit. Its dimensions
are 6mm high, 4.5mm OD, 2mm shaft dia (suits RF-310T-11400 motor). It
has 11 teeth. TIA for any assistance.

- Franc Zabkar

 

[Arfa Daily]

I need the drive gear for the sled motor for a Sharp H8134AF laser
assembly out of a GX-CD555Z(GY) portable 3-in-1 unit. Its dimensions
are 6mm high, 4.5mm OD, 2mm shaft dia (suits RF-310T-11400 motor). It
has 11 teeth. TIA for any assistance.

- Franc Zabkar

Franc

I have stolen gears from many different mechs to replace ones that have
split in the position where you've got the bad one. Some have 13 teeth, but
they appear to run just as well with no tightness or tooth misalignment. If
you have a scrap DVD deck in your junk box, there's a good chance that the
sled drive pinion will do the job. If the one you find has a lip around the
bottom edge, it can simply be put on the shaft the other way up. Good luck !

Arfa

 

[Franc Zabkar]

Franc

I have stolen gears from many different mechs to replace ones that have
split in the position where you've got the bad one. Some have 13 teeth, but
they appear to run just as well with no tightness or tooth misalignment. If
you have a scrap DVD deck in your junk box, there's a good chance that the
sled drive pinion will do the job. If the one you find has a lip around the
bottom edge, it can simply be put on the shaft the other way up. Good luck !

Arfa

Thanks. I tried a 12-toothed pinion and it appears to work. It's a bit
noisy during a full traversal of the sled, but it feels smooth enough
by hand.

I now have a second problem, most likely a weak laser. It's an auto
power control type which I suspect has maxed out. There is a Sharp
IR3C07N laser diode driver IC on the laser assembly. I tried
increasing the laser current by about 20% by shunting the series
current limiting resistor on pin 1. But no joy. :-(

- Franc Zabkar

 

[Arfa Daily]

Thanks. I tried a 12-toothed pinion and it appears to work. It's a bit
noisy during a full traversal of the sled, but it feels smooth enough
by hand.

I now have a second problem, most likely a weak laser. It's an auto
power control type which I suspect has maxed out. There is a Sharp
IR3C07N laser diode driver IC on the laser assembly. I tried
increasing the laser current by about 20% by shunting the series
current limiting resistor on pin 1. But no joy. :-(

- Franc Zabkar

Ha. That's a shame. It's always a real pisser when you do something really
clever like fixing a drive mech from the junkbox, only to find that the
laser is naff. The life of a service engineer eh? who'd want it ... ?

Arfa
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