Most recent revision dated June 14 2021, photo added Aug 12 2022, all (c) copyright Herb Johnson. This Web page shows a Bernoulli 10+10 drive (dual 10MB cartridge drives by IOMEGA), data cartridges, and PC ISA controller cards and cables. It's easy to misspell the name as Bernoulii. The drive was repaired and sold in June 2021. Many other items on this Web page are still available.
photo of front of 10+10 drive Bernoulli 10+10 **DRIVE SOLD in 2021**
drive with cover
rear view with cover removed
brand lable says "Bernoulli Box model A210H; MFD ATH8042; FCC ID DDX7BBA210H"
inspection lable
rear note female DB-37
photo of cables: DB-37 male to DB-37 female. some labeled Bernoulli or IOMEGA.
photo of additional cables: DB-37 and Centronics 50 (SCSI-1) connnectors.
Photo of DB 37 connector, also Centronics 50 connector Please do not give me grief because it's out of focus, that's not the point.
photo of three ISA 8-bit cards, all have a DB-37 male connector external.
closeup of short ISA card, markings "PC2/PC2B" and "code 4.41" on ROM. The IC's on the PC2 board are identified on this sketch. Many of them are programmable-logic chips, so they are uniquely programmed by the manufacturer; they have manufacturer numbers on them to identify them. This board was sold in June 2021.
Previously, I had this card, marked "PC2B50F" near the DB37 connector, and ROM labled "PC2 7.01 (H/A)". The board appears similar to the PC2/PC2B board above, except there's no internal 50-pin header. So it's a slightly different board. The IC's with white lables on them, are likely also the same kind of programmed logic chips as on the board above. I don't believe I have this card as of 2021.
one of three 10MB data carts, sealed unused and the back ;
one 10MB cleaning cart kit, unused, with supplies sealed.
However the cans of cleaner and lub are empty: probably leaked out from years of storage. The white wipes are put inside the cleaning
cartridge to clean the heads.
NINE used 10Mb data carts. **These are still available as of 2021**. Two are in their cardboard covers.
In May-June 2021, I made repairs on this 10+10, A210H drive. My tests were limited to power-up tests and operation of the drive without an active controller. Power tests diagnosed shorted tantalum caps which I replaced. The drives then performed a load/unload cycle when the heads were engaged without a cartridge in place. The drive was sold in June 2021.
Shorted capacitors across the DC power lines, can be diagnosed either by ohms-testing the DC power lines, or by inspection after DC current causes a shorted capacitor to ignite and smoke or burn. Yes, fire is correct. One can also smell the fumes. The fire is due to burning plastic, the shell of the capacitor.
Here's one of the 10MB drives pulled from the cabinet. The drive mounted on top includes a Molex DC power connector for +5V and +12V, just like a floppy or hard drive. The drive under the top drive does not have that connector and so has a slightly different rear PC board. Here's the bottom PC board for the drive. Note the cluster of four yellow gumdrop caps near the center hole of the board. Ohms tests showed a short across the caps in this photo. Unsoldering or clipping one leg of this cap, I was able to ohm it out and find it was shorted. I replaced it with a cap of similar or larger capacity and the same voltage.
In this photo of part of the drive's rear PC board you can see two rectangular yellow caps. One of them has a brown area. When power was applied to the drives, smoke appeared. On disassembly of the drives this cap appeared as brown, and showed a short when one side was desoldered. In this photo, the cap has been replaced with a cap of similar size, slightly larger capacity and same voltage rating; it's what I had available.
Once the shorting caps were found and replaced, the A210H drive was able to power up and stay powered up without loss of DC voltage and with no smoke.
Here's the operating cycle of either drive, when the head-load lever was engaged with power on.
On power up, the green light flickers very briefly.
When I engage the drive lever (no cart):
There's a click which locks the lever.
The drive spindle spins up, the green LED blinks rapidly.
When the spindle is up to speed, the green LED is steady.
I hear small sounds which sound like head seeks. There are several.
Then the spindle spins down, the green LED blinks several times.
When the spindle stops spinning, there's a pause.
The green LED goes off; then there's a click and the lever is unlocked.
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Copyright © 2022 Herb Johnson
