Toshiba 1650

[Art Tech]

Need some assistance on this copier, Toshiba 1650.

I found some scratches on the drum, so I replaced it. Everything went fine. However after the job is completed, copies came out very light in auto mode. I have to use manual mode and stay on the ~70% darker side in order to get the right image. Can you experts help?

- How to make exposure adjustment?
- Is there a service manual available?

This is a nice machine and everything else seems to work good.

Thanks in advance for your help.

[dbrownlee]

05-1 to adjust exposure for manual center position. 05-5 to adjust auto position. No drum counter in this machine, so new drum will copy lighter than replaced drum. Will have to be adjusted periodically as the drum ages- more so when new than when older.

[imaginGuru]

This machine appeared prior to the digital manuals boom, therefore the Service Manual could be difficult to get it on internet, may be easier to get a hard photocopy of it,
(By the way, you can use the following model's manuals-programming is practically the same-: Toshiba 1650/2050/1710/2500/2310/3210/3550/4550/4010).

Now on your problem:
Let's adjust the auto exposure mode:
turn OFF the machine,
while pressing 0+5 at the same time, turn ON the machine, the display will show AJ, once you get here, release the (0+5) keys.
now press 5+COPY key, in the display a number will appear showing the current value for auto exposure (the range is 0 to 255) but some value like 210 will appear. a decent value for a machine that has been serviced (and drum+developer have been changed) is about 180, the lower the value the darker the output. (I'd like to point out here that the service manual says 128 as the default value for almost everything, don't do that).

try first this value; 180, get to it with the ZOOM keys or write it with the keyboard, then press INTERRUPT to store it in memory, you can run a test copy by pressing 3+4 at the same time (in some models also accepts ENERGY SAVER key) if still you get a light copy, lower your value, play with different values until you get the exact output you want, then press INTERRUPT (after each try) to store the value in the machine's memory.

Once you have done this maybe you want to adjust the MANUAL exposure too, for this one press 1 +COPY key instead of 5+COPY (explained at the beginning),
Same procedure as the first one.

Perhaps it'll be better if you adjust the PHOTO mode as well, for this press 14+COPY after releasing the 0+5 explained at the beginning.
To escape of the Service mode just turn OFF the machine, and that's it.

Good Luck.

imaginGuru

[manuals4you]

Both the service and parts manual and the service handbook are available in .pdf format. I have them both on my site at
http://www.justmanuals.com

Paul@justmanuals.com

[Art Tech]

Thanks a lot for the detail instructions. It works very well now.

A question is the setting. My old number in the manual mode was 80. I kept trying and it ended up 20 is the right number. And, for auto mode, reset from 164 to 40.
Is it possible the numbers were so far away from 180 as mentioned?

By the way, it there a setting to change contrast?

Thanks again for all the valuable directions.

[imaginGuru]

Yes, it is possible to get the value you mentioned, as I said before the range is from 0 to 255, ( once I used 0 !), we cannot speak of a "correct" value, but only of a "typical" value here, I think that the amount of voltage needed to get a usable copy is very much affected by;

-rate of usage (age) of the exposure lamp.
-(age)of the drum, if its new it matters if is OEM or KATUN or else,
-Age of the developer. same as above,
-condition/age of the coronas+Grid.
-Don't lose of sight that maybe a technician in the past may have altered
HV output values with the machine, affecting today's adjustments.

As for the contrast adjustment I think you mean Focus (definition ef the edges of a Image), you have to enter service mode 0+5 and pres 61+Copy, this will adjust the 4th mirror position-important:write down the first number appearing, since anything works you'll want to leave it like it was before.
here the typical value is something as 22, you write a lower value say, 19 and compare with the first (normal-without- changes copy), press interrupt to save and make a test copy with 3+4 as usual, repeat with higher values (write down the value you entered in the copy poroduced, say 24 in the 24 adjusted copy, so in the end you will have several sheets of paper with numbers and you will be able to say which one is the best and program that number in memory.
Good Luck.
imaginGuru

[Art Tech]

Thanks for the details.
I think I'll stay away from playing with focus function this time. The copies came out is still acceptable for now. It will be nice to know the complete listing before jump into the next attack.

Thanks again for the valuable technical tips.

Hi, I'm not a photocopier technician, but I'm an art school technical officer, and we have a Toshiba 1650 that we love dearly. We have no problems getting toner for it, but our service guy says that the drum is getting too old and that it's impossible to get new parts. We're desperate to keep it alive!

Does anyone know where I could source a drum for the T1650?

[Mr Spock]

A quick google search turned up over 100 entries and this being the most promising that I selected off of the first page.

Toshiba 1650 OPC Drum :: Photoreceptors :: PPC Solutions Ltd

Many thanks, Mr Spock. We'd tried googling 'Toshiba 1650 drum' (which is how I found this website) but the inclusion of the OPC bit helped immeasurably.

No doubt I'll need more advice along the way about keeping this baby alive.