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7.098 bytes |
Service Hints & Tips |
Document ID: GSMH-3B4HEL |
TP 355,360,370,750,755 - Memory Checkout
Applicable to: World-Wide
Memory Checkout:
Depending on the model, the memory size that is available for customer use appears differently. This is not a hardware problem. See the following table for the available memory size of each card.
Note:
For Models 370C, 755C and 755Cs, one of two types of memory cards can be used, IC DRAM card or DIMM card. If DIMM cards are installed, replace IC DRAM with DIMM in the following.
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IC DRAM |
Thinkpad 750, 750C, 750Cs, 750P |
ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs |
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0 MB |
3904 KB |
3712 KB |
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2 MB |
5952 KB |
5760 KB |
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4 MB |
8000 KB |
7808 KB |
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8 MB |
12096 KB |
11904 KB |
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16 MB |
20288 KB |
20096 KB |
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DIMM |
370C, 755C, 755Cs |
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0 MB |
3712 KB |
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4 MB |
7808 KB |
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8 MB |
11904 KB |
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12 MB |
16000 KB |
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24 MB |
28288 KB |
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16 MB |
20096 KB |
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20 MB |
24192 KB |
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32 MB |
36480 KB |
Memory errors might stop system operations, show error messages on the screen, or hang the system. The computer detects memory parity errors but does not correct them.
Use the following procedure to isolate memory problems.
Notes on Memory Errors:
For Models 355x, 360x, and 370C, ignore any references to parity errors. DIMM Adapter and DIMM card are not supported for 355x and 360x. Remove them (if installed).
1. Installing a non-parity memory card causes memory errors. Before you go to the next procedure, check whether or not the memory card use parity or non-parity. If the non-parity memory card is installed, disable the parity check on Easy-Setup configuration screen.
2. Make sure that the memory card is fully installed into the connector. Loose connection can cause an error.
3. Power-off the computer and remove the IC DRAM card, or DIMM card from its slot (if installed).
4. Press and hold the F1 key; then power-on the computer. Hold the F1 key down until Easy-Setup screen appears.
5. Select Test and press enter.
6. Select Memory and press enter to run the memory test on base memory. If an error appears, replace the system board.
7. Power-off the computer and reinstall the IC DRAM card; then power-on the computer. Verify the memory size; then test the memory. If an error appears, replace the IC DRAM card.
If memory problems occur intermittently, use the loop option to repeat the test. When the test detects an error, an error log is printed on the printer connected to the parallel port. See żError Log— for more information.
If a parity error is logged in CMOS, POST error code 118 appears when the power is turned on. To clear the log and to test the memory, run the memory diagnostic. If no error is detected by the test, the log is cleared, and error code 118 will not appear the next time the POST is run. If the 118 error code occurs repeatedly, determine and replace the failing memory FRU. FRUs should not be replaced because of a single, un-reproducible failure. Single failures can occur from a variety of reasons that have nothing to do with a hardware defect such as: cosmic radiation, electrostatic discharge, or software errors. FRUs replacement should only be considered when a recurring problems exits. If this is suspected, clear the error log and run the test again. Do not replace any FRUs if log errors do not reappear.
System Programs in Flash Memory: System setup programs and diagnostic tests are stored in Flash memory.
Flash Memory Update:
A flash memory update is required for the following conditions:
- New versions of system programs.
- New feature or options are added.
When Updating Flash Memory:
Do not power-off the &c., disconnect the Vac power, or remove the &bp. during the Flash update.
On certain systems, updating Flash memory can reset all customer's configuration settings to the default values.
To update the Flash memory, perform the following steps:
1. Connect the AC Adapter and install the battery pack. ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs
2. Get the appropriate diskette which contains the update.
3. Insert the System Program Service Diskette into drive A and power-on the computer.
4. Select Update system programs from the menu.
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Search Keywords |
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Hint Category |
Hardware Maintenance Information, Memory | |
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Date Created |
04-11-96 | |
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Last Updated |
17-04-98 | |
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Revision Date |
10-04-99 | |
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Brand |
IBM ThinkPad | |
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Product Family |
ThinkPad 355, ThinkPad 360, ThinkPad 370, ThinkPad 750, ThinkPad 755C/CS | |
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Machine Type |
2619, 2620, 2624, 9545 | |
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Model |
Various | |
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TypeModel |
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Retain Tip (if applicable) |
N/A | |
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