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C156-E142-02EN 3 - 11
(7) System ground
The optical disk drive should be grounded to the signal ground (SG) of the power supply of the
system. This SG line should be supplied with the system.
The Frame Ground is shorted in the optical disk drive by a metal strip attached to the vibration
isolation rubber between the frame (FG) and the base (SG).
When mounting the optical disk drive in the Device Bay 120mm (5
inch) of the PC chassis, there are two ways of choosing frames the
metal frame and the plastic (nonconductive material) frame.
When using a plastic frame, there is not a short circuit between FG of
PC and FG of the optical disk drive. As a result, the static electricity
tolerance decreases compared with metal frame.
It is recommended to use a metal frame to enhance the static electricity
prevention.
3.3 Power Supply Requirements
(1) Allowable input voltage and current
The DC power supply input voltage measured at the power supply connector pin of the optical disk
drive (receiving end) must satisfy the requirements in Section 2.1.3. (For other requirements, see
items (4) and (5) below.)
(2) Current waveform (reference)
Figure 3.8 shows the +5 VDC waveform at start of spindle motor rotation.
Figure 3.8 Current waveform (+5 VDC)
[ms]
10080604020
0
0
2.0
1.5
1.0
0.5
(A)