Toshiba T2000 Maintenance Manual page 23

Procedure 3: Replacement Check
Procedure 1
DC IN Indicator Check
1. When the T2000 AC adapter is connected to a live wall outlet and the T2000, the DC IN
indicator will light red. If the AC adapter or the power supply is malfunctioning, the DC
IN indicator will flash red or does not light at all.
(1) If the DC IN indicator flashes red, refer to Check 1.
(2) If the DC IN indicator does not light, refer to Check 2.
Check 1 When a power supply problem occurs, the DC IN indicator will flash repeatedly
with a 4-bit status that varies depending on the problem.
The DC IN indicator is off for two seconds and then it lights for either ½ second
(indicating a binary 0) or one full second (indicating a binary 1). There is a one-
second interval between bits, with bit 0 (zero) or the least significant bit first and
ending with bit 3 (three) or the most significant bit.
For example, the following timing chart shows a status of 5h (0101). The timing
chart below is read from right to left.
The status and its meaning are described in Table 2-1.
However, when the DC IN indicator blinks at random, the AC adapter or charging
circuit may be damaged. In this case, replace the AC adapter with a new one. If the
(Paste timing sequence)
2-9