IBM Aptiva 2142 Hardware Maintenance Service

Also see for Aptiva 2140: Maintenance service manual Hardware maintenance service

Amplifier Card BIOSType 2140, 2142 computers come with either a Tier 1 or Tier 2 amplifiercard.Tier 1 amplifier card has one speaker output jackTier 2 amplifier card has two output jacks; one for the speakers andone for the sub woofer.When replacing a system board, the BIOS setting on the new system boardmust match the amplifier card that is installed in the computer.New A-1 and A-2 system boards for Type 2140, 2142 are coded for the Tier1 amplifier card. If the computer you are servicing has a Tier 1 amplifiercard, no BIOS coding is necessary.If you order a new system board for a 2140, 2142 that has a Tier 2 amplifiercard, the amplifier card BIOS must be set to match the Tier 2 amplifier card.Amplifier Card BIOS SettingAttentionThe Amplifier BIOS update procedure must be run from a Safe ModeCommand Prompt.Care must be taken to make certain that the BIOS setting matches theactual amplifier card (Tier 1, Tier 2) installed. The sound system will notfunction properly with the incorrect setting.1. Determine the amplifier card installed. From the rear of the computer,there will either be:One mini DIN connector (speaker), Tier 1,-- or --Two mini DIN connectors (speakers and sub woofer), Tier 2.2. Determine the system BIOS setting for the amplifier card.Reboot the computer to a Safe Mode Command Prompt.a. Select Start from the lower left desktop.b. Select Restart The Computer, then Select Enter.c. When Starting Windows 95 displays at top left corner ofscreen, depress F8.d. Select Safe Mode Command Prompt Only from the menu.e. At the C: prompt, type DEBUG and press the Enter key.1-16All manuals and user guides at all-guides.com