IBM 1412 - Manual (Page 12)

Note: Signal lines, not used in these steps, are used
for communication between the system and
the battery.
3. If the voltage is less than +8 V dc, recharge the
battery pack.
If the voltage is still less than +8 V dc after
recharging, replace the battery.
Terminal Signal / Voltage (V dc)
4 Reserved
5 Thermal
6 Sense
7 Ground
Planar Board Check
The planar board performs processing functions. Thus, the
planar board can cause processor problems. To verify the
problem, do the following:
1. Boot from the diagnostics diskette and start the PC
Doctor program (please refer to “Running the PC
Doctor Diagnostics Program” on page 29).
2. Run the System Board test to verify the symptom.
This test verifies both the planar board and the CPU
board.
If the tests detect a planar board problem, replace the
planar board.
Note: Don't touch the keyboard and pointing device when
the planar board (system board) test is running.
This may cause an unexpected error.
Memory Check
DIMM are available for increasing memory capacity.
DIMM DIMM Total Memory
32MB 0MB 32MB
0MB 32MB 32MB
32MB 32MB 64MB
64MB 0MB 64MB
0MB 64MB 64MB
64MB 32MB 96MB
32MB 64MB 96MB
64MB 64MB 128MB
128MB 0MB 128MB
0MB 128MB 128MB
128MB 32MB 160MB
32MB 128MB 160MB
8 ThinkPad i Series 1400