Toshiba 4520c

[willmc1967]

I have been having trouble with the drawer lift motor. It seemed like the engage gear was not springing forward enough to catch the t bar on both drawers. I took the motor out and cleaned it up (seemed to have excess oil on the bottom gear set and it was sticking) and it works much more smoothly now but it still has trouble catching the t bar on BOTH drawers. The engage gear springs back out easily for both drawers but it misses the t bar 7-8 full cycles before it will engage. I have to open and close the drawers over and over before I can get the paper to register. Do I just need to buy a new motor or is there some adjustment that I can make? Any help is appreciated.

By the way, the motor seems to have plenty of torque. It seems more like a clearance issue to me but I don't see any way to close the gap. You can feel the drive touching the t-bar but not quite engaging. Hope that makes sense.

[Hansen88]

Re: Toshiba 4520c

I have not seen one that would not line up before,but I have seen many where there is a tooth or two missing on one of the gears in the lift unit and by opening and closing drawer it will eventually catch. Maybe you have a issue like that.

[willmc1967]

Re: Toshiba 4520c

Thanks for the reply. When I took the motor out I inspected every gear in the box and they were fine. For the life of me I can't understand why it won't engage. If you take a drawer out and stick a ruler between the slots in the gear and then actuate the motor it will twist very hard. Can't feel any slippage whatsoever.

[didi2005]

Re: Toshiba 4520c

U also need to check the tray up gears, will worn out

[Ropariva]

Re: Toshiba 4520c

Is the engaging gear white or black? I found the white ones would round off causing this issue, and the black ones simply broke

[willmc1967]

Re: Toshiba 4520c

The gear is actually light grey. The gear I am talking about is the one that you can see in the back right corner of the printer when you take the drawer completely out. There really aren't any "gears" on the tray itself that raise the paper up. It is simply a rod that has a t bar at the end that is supposed to be engaged by the 4 tooth light grey gear in the machine.

[Ropariva]

Re: Toshiba 4520c

Take the whole tray lift assembly out, get it apart and check for broken teeth on the internal gears. The housings can also crack which will cause these symptoms. The dog teeth that engage the cassette can also round off I've also seen a broken cassette cause similar, but my bet is with a cracked drive housing. Have replaced many of these over the years on various models. They really were something the Tosh engineers struggled to get right. They tried different plastics from white(soft) through to black (strong but brittle) light grey was supposed to be the best of both worlds.

[willmc1967]

Re: Toshiba 4520c

I was leaning towards just replacing the lift assembly. I have already taken it out and checked the internal parts but I didn't really pay close attention to the housing. I thought I had already found the problem (excess oil that was causing the lower drive to stick a little) and just reassembled and put back in. At the end of the day a replacement is probably best. Thanks for your insight.

[Ropariva]

Re: Toshiba 4520c

Try swapping the trays around if you haven't already tried that. At least eliminate those. If you have a replacement unit, problem solved[emoji1303]

[blackcat4866]

Re: Toshiba 4520c

Keep in mind that there are greased spring clutches inside the drive unit. Bathing the lift drive in oil is a great way to make it non-functional. We've had a few techs over the years that would oil electromagnetic clutches, leather pad torque limiters, greaseable torque limiters, and even magnetic torque limiters. Surprisingly not everything is improved with oil. =^..^=

[Oystercopy]

Re: Toshiba 4520c

Keep in mind that there are greased spring clutches inside the drive unit. Bathing the lift drive in oil is a great way to make it non-functional. We've had a few techs over the years that would oil electromagnetic clutches, leather pad torque limiters, greaseable torque limiters, and even magnetic torque limiters. Surprisingly not everything is improved with oil. =^..^=

OMIGOSH.. these are the kind of things that I absolutely DREAD hiring another tech to help me out....I have enough problems keeping my own machines running than to add extra stress where guys would OIL things (I hardly oil ANYTHING in a copier any more!) that are not meant to be oiled. But how do you TEACH these kind of things? LOL
OC

[clint@clintsimonsen.com]

Re: Toshiba 4520c

I've had issues with the shaft in the t bar slipping so it is short in one end also there are 2 lengths of coupling gears for the newer black lift motor gear box. You may like to check

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