AC Power Cord Hook-Up
Front of Power Supply
Dead PSU, or Is It Dead?
Status Light Meanings
Power Supply Voltages and Current
Cleaning the PSU
The GEARBOX Model 800 is a direct-wire system, using a customer-provided power cable to an applicable power source. 300 total watt worldwide, autoranging (will detect and switch for 120 or 220) power supply, with two fans to assure system cooling.
C - Terminal Cover screws
NOTE: If you pull the rightmost shroud (#9) you can get a grip on the rear right inner corner of the PSU....
Rock the PSU a little as you pull it out. The plug is at the back of the PSU behind the power switch. It resembles a mutant 95 planar plug. Do NOT grab the black plastic guard around the power switch!!!
PSU or Is
It Really Dead?
Dr.Jim Shorney did the office call
WARNING! Do NOT start the system in Standby mode!!! Avoid turning on the system with no AC power attached when the internal battery is installed. This will severely discharge the Ni-Cad battery... (no foolin' !)
Power Source Choices
120 / 220
6.0A / 2.7A
Power usage .75KVA
AC Power Cable
(INTERNAL) (#6221) (P/N 15F8625):
NOTE 1: Battery or EVM must be installed to retain system set up information during periods when system is shut down. (though there is a whopping big 5v 1F cap on the system resource board).
NOTE 2: Shutdown is limited to max of 10 sec under hardware control. Software control shutdown depends on the electrical load and the battery capacity, and may be limited to 10 seconds. Longer shutdown periods require external battery backup, which requires an EVM.
The battery pack is 21 (twenty-one) Sony Cadnica KR-SCH 1.2v 1200mAh, Standard charge14-16 hrs at 120mA, recommended trickle charge 40mA.
Marked "Plainview Batteries, Inc" mfd- 9104 IBM replacement PN 15F8625
(#6231 AND #6528):
NOTE: Either an EVM (hooked to an external DC voltage source), or internal nicad battery (#6221) must be installed to retain system set up information during periods when the system is shut down.
The EVM provides RFI filtering, reverse polarity protection, and over voltage protection.
WARNING: A fully
requires up to 30A on the DC line. Use a minimum of
ETRI Model 98DW 98DW1LP31 203, 12v (8-15v) at 5.2W (under .5A)
Changing Airflow Direction
Remove the three standard screws in each
fan housing. Pull
them out and flip them over to whatever way you want. If
you are unsure
about the direction, there are two arrows embossed on
the fan housing,
showing fan rotation AND airflow direction.
Cleaning the PSU
Hooray! I stumbled onto this working on the fans...
At first look, it's grim. Rivets everywhere. Don't give up. Flip PSU upside-down. Unplug fan power connectors. Remove all fan screws. Pull up on grille and push the fan power connectors through using a flat bladed screwdriver. Now the grill comes off, and the majority of the PSU components are exposed.
Copper heatsinks! Stud power diodes!