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Belits Computer Systems


TD-S448664A-G2-001 User's Manual

3. Maintenance, hardware reconfiguration, upgrades and repair.

The front compartment contains up to three hard drives, CPU blower, power supply intake fans, network connectors bracket and the front panel assembly.

Rear compartment contains motherboard, CPUs, cooling system and up to two PCI boards.

Power supply is installed behind the front compartment, and three mounting screws attach it to the front compartment's floor. There are no user-serviceable parts inside the power supply. Case fan is located under the power supply cover, near the CPU blower.

Network connectors bracket/shield is attached to the LCD/controls/console bracket with one 3/16" 4-40 screw, and covers the network cables passing over the power supply.

3.1. Precautions.

All maintenance operations that involve opening the computer case should be performed while computer is powered down.

In no situation any liquids should be allowed to be spilled inside the case, or on a working computer.

Do not open the power supply case, or remove any screws on it.

Plug in all fans and blowers immediately after installation. Don't turn the server on without the complete set of fans installed and plugged into the corresponding power or power/sensors headers.

3.2. Hard drive replacement.

Open the front compartment cover by unscrewing two front thumbscrews, then using them as handles, pull the cover horizontally toward the front of the case, then upwards, disconnecting it from the sliding hooks within the case walls.

Each hard drive is installed in the aluminum cage, attached to the nuts embedded into the floor of the case with four captive 4-40 screws. Unscrew them from the bottom of the case, paying attention not to lose the retaining nuts that keep screws attached to the hard drive cage. Pull the cage up, using its top as a handle if necessary.

Disconnect the data and power cable connectors. Take the cage outside of the case. If retaining nuts shifted toward the end of the screws, return them back to their normal position.

Remove four more screws that keep hard drive inside the cage. Even though all three cages are exactly the same, there are two possible hard drive positions within the cage. Hard drive in the leftmost cage (Primary Master in the IDE version) is shifted toward the rear of the cage, to leave enough space in front for the front panel assembly. Hard drives in center (Secondary Master in the IDE version) and rightmost cage (Secondary Slave in the IDE version) are shifted toward the front of the cage, leaving space for wiring and CPU blower behind them. When replacing hard drives or moving them between those positions keep in mind those differences in hard drive mounting.

Fig. 43

Fig. 43: Hard drive #1 mounted in a cage

Fig. 44

Fig. 44: Hard drive #2 or #3 mounted in a cage

Replace the drive, mount it with four screws in the cage, attach power and data cable connectors, and install the cage into its original position within the case using four original screws.

Before closing the case, make sure that all cables are properly arranged, and do not protrude above the cages.

Close the front cover by pushing it down, then forward until the hooks lock and the cover touches the power supply. Secure the cover with thumbscrews.

3.3. CPU blower replacement.

Remove front cover and at least two right hard drive cage as described in the hard drive replacement procedure.

Disconnect CPU blower power plug from the power distribution board in the middle of the power supply.

Remove two screws holding the CPU blower guard and CPU blower itself. Pull the CPU blower back and up to disconnect it from the air duct under the power supply assembly. Install a new blower, aligning it with the duct, so the fan's outlet will fit entirely inside the duct. Reinstall the guard and screws, reconnect the power plug to the header on the power distribution board.

Reconnect and and put back the hard drive, then close the front cover as described in the hard drive replacement procedure.

Fig. 45

Fig. 45: CPU blower (centrifugal version) installed in the case

There are two versions of the CPU blower — a centrifugal blower and a unit with axial fans in a duct for CPUs with higher airflow requirements. They have the same mounting points and cables, and the same connection to the CPU heat exchanger air duct.

3.4. CPU replacement.

Remove the rear cover by unscrewing two rear thumbscrews, and pulling the cover back, then up using thumbscrews as handles.

Disconnect the 24-pin and 8-pin power connectors, and 10-pin console ribbon cable connector.

Remove the heat exchangers' cover by pulling it up:

Fig. 46

Fig. 46: Heat exchangers' cover

Fig. 47

Fig. 47: Heat exchangers' cover removed

Remove the metal flap that covers heat exchangers' air intake:

Fig. 48

Fig. 48: Heat exchangers' flap removed

Fig. 49

Fig. 49: Heat exchangers' flap

Remove the CPU retainer bracket and a spring after removing two #6-32 screws that hold the CPU retainer bracket to the baseplate.

Remove the cooling system assembly. Be careful, the bottom of the cooling system's evaporator that touches the CPU is covered by the thermal compound and may stain skin, clothes, paper or various surfaces if placed over them.

Fig. 50

Fig. 50: CPU #2 cooling system removed

Fig. 51

Fig. 51: CPU #1 cooling system removed

Clean the cooling system's surface with a cleaning cloth or napkin. Use isopropyl alcohol for further cleaning if necessary.

Pull the CPU retainer lever up, lift CPU from the ZIF socket, and place CPU into the storage container. Install the replacement CPU into the ZIF socket and turn the CPU retainer lever back to secure new CPU inside the socket. Do not apply excessive force, align CPU and socket markings when installing to ensure a proper CPU orientation.

Clean the bottom surface of the cooling system's evaporator with a dry napkin. If necessary, use napkin soaked in isopropyl alcohol, then again a dry napkin. Place a small amount of thermal compound on the clean bottom surface and spread it. Clean the surface with a dry napkin, leaving no remaining thermal compound visible on the surface. Thermal compound will fill microscopic scratches on the surface, slightly changing the surface color toward gray or white.

Cover the CPU heat spreader with a thin layer of thermal compound. Use a plastic sheet, credit card, special spreader or similar object to spread a small amount of thermal compound (about the size of a 1-3 uncooked grains of rice) over the CPU heat spreader surface. Do not place compound on any other surfaces. If spilled, clean the excess of the compound with a napkin soaked with isopropyl alcohol, then with a dry napkin.

Put the cooling system back in its place. Pay attention to the air duct flap that should cover the fins at the intake side of the heat exchanger, and the bottom support at the exhaust side of it. The evaporator should rest on the CPU heat spreader surface, without touching any other components, and pipes should not touch any components on the motherboard.

Install the spring and bracket, attaching it with two screws. One of the CPU #1 bracket screws also holds the wire guard bracket.

Do not try to move the cooling system after it touched the CPU heat spreader. If it ended up in a wrong position, remove it from the CPU, re-apply the thermal compound to the CPU heat spreader, clean the bottom surface of the evaporator with a dry napkin, and re-install it.

Install the metal flap on the heat exchangers' intake, make sure that two small protrusions on its front edge are properly inserted into slots on the top of the air duct, and it is placed between the heat exchangers, directing air from the air duct to the fins.

Install the heat exchangers' cover. Align all openings in the cover and slide it down until it is held securely from all sides.

Reconnect the 24-pin and 8-pin power plugs, and 10-pin console ribbon cable connectors.

Make sure that all cables are secured in their places, and they do not pass above the CPUs or installed RAM, protrude over the back panel, or are caught inside the groove behind the power supply.

Install the back cover by sliding it to the front and secure it with two thumbscrews.

3.5. RAM installation/replacement.

Remove the rear cover by unscrewing two rear thumbscrews, and pulling the cover back, then up using thumbscrews as handles.

If you are removing the installed DIMM module, open two plastic latches on the sides of the RAM socket until they push the module out, then remove the module and place it into a bag or container.

Pull the plastic latches on the RAM sockets apart, and install new DIMMs. Make sure that modules don't get scratched by various parts on the motherboard, and wires are not caught between the socket and the module. Edge connectors on the modules and the sockets have an asymmetrically placed key that align against its counterpart if the module is placed properly. Do not apply an excessive force to DIMMs or plastic latches.

Plastic latches should start closing while the DIMM is being pushed into the socket. After the module is seated in the socket, pull the latches toward the center of the socket, to close them further if necessary.

Make sure that all cables are secured in their places, and they do not pass above the CPUs, protrude over back panel, or are caught inside the groove behind the power supply.

Install the rear cover by sliding it to the front and secure it with two thumbscrews.

3.6. PCI boards installation.

PCI boards should be installed on special 1u risers, and supported by PCI board holders installed on screws wherever necessary.

Fig. 52

Fig. 52: PCI board holder

Some boards may need special brackets, such as standard half-height brackets and special brackets designed specifically for TD-44 servers' cases and those particular boards. The following should be used a a guide for possible configurations of PCI/PCI-X board installation in TD-44 servers, however in any particular case the boards should be securely installed, with only minimal forces passed to the connectors, and no possibility of connectors coming loose, getting disconnected, boards touching the case covers, or damaging other parts of the servers.

Most of PCI boards can be installed in two positions, in 64-bit slot and in 32-bit slot:

Fig. 53

Fig. 53: PCI board installed in 64-bit slot

Fig. 54

Fig. 54: PCI board installed in 32-bit slot

Oversized boards (with PCI board protruding above the bracket) may be placed using a different arrangement of risers and holders. Please note that the board holder is turned 90° from its original position:

Fig. 55

Fig. 55: Oversized PCI board

The photos merely illustrate possible positions and application of risers and PCI board holders. Additional holders, insulators and brackets may be necessary to secure particular boards inside the case.

Various other PCI risers, board holders, custom brackets, etc. can be used to accommodate a wide variety of PCI boards in TD-S448664-G2-001 servers. Please note that MS-9161 motherboards have 32-bit PCI slots (two in version 1, one in version 2) running at 33 MHz, and 64-bit PCI-X slots can run at 66, 100 and 133MHz.

PCI-X slots can support 32-bit 3.3V PCI boards but not older 5V PCI boards.

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