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Planar Power Supply Connectors Pinout (P1/P2) The power supply automatically switches to the 100-125 V AC range or to the 200-240 V AC range.The AC input is converted to DC outputs that supply the system with proper operating voltages. When the system is powered-off for 8 seconds or more and then powered-on, the power supply generates a "Power Good" signal that resets system logic. The presence of the 'power good' signal turns on the green power-on light on the front of the system indicating that the power supply is functioning correctly. PSU Is Part of Case Structural Integrity The Model 90 PSU must be part of the structural integrity of the 90 case. Sorta explains why the little support arm by the floppy exists. That way, any force on the back of the case is transferred through the PSU to the drive support shelf at the front. If the PSU is not mounted, then there is little support to keep the back of the case from being bent forward... Planar Power Supply Connectors Pinout (P1/P2)
Check the voltages with connectors P1 and P2 plugged into the system board.
P1/P2 Conductor Clamp
The 50 wire flat cable clamp is a TYCO / DEK 038-250 deklip / AEH 03-26-50. The cable clamp is not really needed for keeping the power plugs on the edge connector and away from the case cover. Try pulling a seated power plug OFF a planar edge contact and you will understand why... So if yours is missing or broken, don't worry about it too much. Jump-starting the Power Supply Shut down the machine, unplug power cord from the PSU and open the case. Then unplug power-supply cables P1 and P2 from the planar and connect the power cord back to the unit. Short pins 7 and 8 on the power-supply connector P2 to start the unit. The power-supply cooling fan must come up almost immediately - if you hear just a tiny clicking noise from the unit and power-supply is probably defective and has to be replaced. If the built-in fan comes up, check voltages. If all of them are within the given range the power-supply is functional, at least without load connected. Power Supply Models All units I've seen were made by AcBel Polytech Inc. You probably won't find their name anywhere on the unit, but you can tell by the "API" model prefix, and by the old AcBel logo:
There are at least two different PSU models for the 90. (I've heard rumors of a 150W PSU.) Rich Wolos said: 64F4114 194 W (from Jan 92 HMM), Yellow/Black power leads (like on the 95s)
92F0088 215 W (from 96 HMM), Red/Black/Blue power leads
Power Supply Overview PSU from my early 8590. Notice the short drive power leads. No voltage select switch on the back side - this is an auto-ranging unit. Notice how the front half of the top cover is slightly lower than the rest. This was probably done to make space for the flat SCSI cable.
Detail of the label. AcBel API-0009 REV B, 28 A @ 5 V (194 W), FRU 64F4114 and P/N 64F4408.  Different sample (found online HERE). AcBel API-0009, still REV B, 28 A @ 5 V (194 W), but FRU 92F0088 and P/N 92F1617.
Short Power Leads The older API-0009 REV B PSU has a very short drive power leads. "I read about this in some old ECAs, someone was asleep at the switch and the manufacturer cranked out a number of PSUs with very short leads. Nothing wrong with them otherwise." Rich Wolos referred to old PSU models with yellow/black wires, maybe he was confused over the HD cables plugged into the blue/red leads? Or are there old PSUs with short yellow/black power cables? Tom says: Removing Power Supply
Unscrew captive screw on Power Supply Bracket (1). Pull top up and forward, away from PSU and continue rotating it forward until Bracket is free of bottom clips on the PSU. Now pull Bracket towards the rear of the system until the front tip can be pulled from drive shelf. Unscrew both black slotted hex washer screws (2) from the back of the system. Note: If you use a small bladed screwdriver, it may pop out of the slot on the 3/16 hex head / slotted screw. This can displace some metal to the outer side of the screw head which will keep a nutdriver from slipping all the way over the screw head... So... either always use a 3/16 nutdriver or a 3/16 wide screwdriver to prevent popping out of the slot... Unscrew the single black slotted hex washer screw from the front case support bracket. Unplug the planar power supply sockets from the board and pull the PSU straight upward, so as to unhook the tabs at the back of the PSU from the rear wall of the case. Opening Power Supply PSU Side, Towards Complex
You need a T-15 security TORX. There are three Button Head Torx Security Cap Screws on the inner side (towards the complex). PSU Side, Planar Power Cables
Note: The black screw to the lower left corner also fastens through the front PSU support bracket and into the PSU case. In short, the cover will not come off with the black screw installed. PSU Front, Heatsink
The one long T15 screw (towards the floppy) screws into a heatsink inside the PSU. Unclip the long cable retainer on the side and free the Planar power leads. Flip PSU upside-down. Pull the case (bottom) straight up. Power Supply Inside (API-0009 REV B, FRU 64F4114, 194 W)
Power Supply Fuse  F401 is T6.25A / 250V, "Only replace F401 with Wickmann 19343" "T" stands for Time. Wickmann 19343 Datasheet or 03136.25 - 313 Series 3AB/3AG (6.3x32mm), Slo-Blo Fuse Warning: The Model 90 HMM says "3 Amp Fuse 72X8561", which is dead wrong! Obey the machine... Power Supply Fan
Panaflo Panaflo FBK-09A12M Specs
Motor Type [FB]: Panaflo (DC Axial-flow fan)
Power: 1.13 W Remove PSU Fan There are four T15 Flat Head Torx Security Cap Screws that fasten the PSU fan frame to the back wall of the PSU case. There are 4 captive tooth washers (Tooth Washer Lock Nut) on the inside. When replacing the fan, you really need a locking hemostat to hold the captive tooth washer on the inside of the PSU. The PSU quality is similar to a 8595 PSU. The heatsinks are thinner than on a Model 95 (about 1/16ths to 3/16ths), but for a 215W PSU they are quite acceptable. PSU Fan Power Connector Original P/N on terminal housing is 5051. Engineering/Old PN: 5051-02 Part Number: 0022011022 2.50mm Pitch KK Wire-to-Board Housing, Female, Friction Lock, for 2759/5159 Crimp Terminals, 2 Circuits Extractor Tool (HT-2759) Removal of all 2.54mm (.100 in.) "KK" Terminals
Note: Or you could
use a jeweler's screwdriver or a bobby pin to push the
locking tang up. If I was doing LOTS of terminal
replacement, I might buy his tool. For one or two, let
me dig through my toolbox or kitchen drawer... This information is presented here, just in case I need it in replacing the stock fans with some Noctua models... Thermal and Power Handling Capabilities ("Little Big 90") I'm worried about heat during extended sessions. There are no drives in the case sucking power and no bulky SCSI cable, but that still doesn't resolve the fact that the 90 really wasn't meant to take a Pentium. From Al Savage: The SETI clients make sure that processor utilization is always at 100%, so the CPUs are running as hot as they can ever will. The P60 & P66 run a lot hotter than the P75/P90/P100 etc (13 watts, IIRC), and I can put my hand on the heat sink and not get burned. Hell, my AMDs run hotter. No baffle, the front case fan moves about twice the air that any of the clone cases do. The CPU's heat sink is still directly in the airflow. I *do* keep the case vacuumed out, though. I take the covers off every six months and Kirby the guts. Dust builds up rapidly, and is an excellent insulator. Both units are on a 3.1VA (BIG!) UPS. My opinion is that cooling is not a problem on the 8590. I have not had to replace the PS. I keep a "spare", pre-configured identical 8590 as backup (just swap in HDD & go), but I've never used it. Ed. With either a 194 or 215W PSU, the 90 compares favorably with the 9577 PSU, which was 194W. But nobody complains about the "weak" 9577 PSU, do they? Power Supply Testing Peter Wendt sez: The easiest way to test the power-supply if it is still working at all is to open the case, look at the right side under the power-supply, locate the 2 plugs from the power supply to the planar and carefully unplug them by simply pulling them out. It might be a bit difficult to get them back this way - but if the power-supply is broken you will have to remove it anyways when you get another one, so we can leave that at the moment. Now, once you got the two plugs pulled out - look at them. The one "P1" marked connector has 2 blue, 6 red and 1 black cables... that's the lesser important one at that point. The second "P2" marked is the one we need to look at closer. Do the following: re-attach the machine to the AC, then use a piece of wire or a bent paperclip and connect the white wire with one of the neighboring black ones. No danger - the highest voltage on that side of the power-supply is +12VDC. the white line is "+5V sense voltage" and the black one is GND. As long as the white wire isn't attached to GND the other voltages are 0 VDC (power supply deactivated) so there is no risk of accidentally shorting any voltage at all. In case the connection is good and the
power-supply itself is functional the power-supply fan
should come up - and most likely the machines' hard-disks
as well, which are directly attached to the power-supply
with 4-wire DC-cables. If the power-supply comes up the
problem sits somewhere else: In case nothing happens apart from a faint "click" inside the power-supply... now... get familiar with the idea of getting a spare from somewhere. It often pays trying to get an entire working machine rather than only a power-supply. Mod. 8590 without hard-disks and memory often sold for some 30 - 40 bucks ... some ask 40$ for the power-supply alone. The 9590s may cost some more - the power-supplies however are identical as far as I know. The main difference between an 8590 and a 9590 is the 1.44MB FDD on the 8590 and that some versions come with only a 512K XGA-1 on the planar. Everything else (processor board, memory, power-supply, hard-disks) can be interchanged among the models. A high pitch whistle indicates the PSU will not pass this test and is broken. Usually these power-supplies are pretty reliable - some of them suffer on "long term problems" with dust contamination and related overheating. In case there were an over-current condition (overload on +5V / +12V lines) it should come up in the above-mentioned test - if that malfunction is not caused by the hard-disks. Try detaching the 4-pin power-plugs from the hard-disk(s) and retry ... if the malfunction persists even with nothing attached to the power-supply it is definitely broken. To fix these kind of "switching power supplies" you need some more equipment than only a multimeter, a pair of scissors and a roll of duct-tape. Parts inside these supplied are directly connected to mains AC and converted into DC impulses of hazardous voltages and frequencies ... so I would not even recommend trying to open the box if you do not exactly know what you are doing. In case of doubt: leave it as it is. There are a few "power-supply gurus" out which may be able to repair the unit - but they are hard to find. Planar Power Supply Contacts Power Supply / System Dead? Symptoms: Wolfgang Gehl says: Peter said (edited): Cleaning Planar and Plugs Rick Ekblaw had way too much time on his hands:
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