Cmos Battery Replacement - NEC POWERMATE V Service Manual

4-8 Maintenance and Troubleshooting
Problem
CD-ROM
Malfunction
(cont'd)
Communication
Error

CMOS Battery Replacement

The CMOS is backed up by either a 3-volt lithium battery or real time-clock (RTC) chip
intalled on the board. Replace the CMOS the battery or chip from system board as follows.
1. Turn off and unplug the system unit and any external option connected to it.
Remove the system unit cover.
2.
Locate the battery or chip socket on the system board (see Figure 4-2).
3.
Battery
Real Time-Clock
Chip Location
(not shown)
Table 4-2 Problems and Solutions
Symptom
No sound from CDs.
No or bad data when
communicating.
Figure 4-2 Battery Socket Location
Solution
1. Check that speaker power is on and
volume is adjusted.
2. Check audio software settings.
3. Check CD audio cable. Replace as
necessary.
4. Replace CD-ROM reader.
5. Replace system board.
1. Check cable connections between
system board and device.
2. Check that the interface port is
selected.
3. Test or replace the device and
interface cable (see the device
documentation for troubleshooting).
4. Replace system board.