This also led to a discrepancy where the U.S. and European launch units had the same part number series (SCPH-100x) as the Japanese launch units, but had different hardware (Rev. B silicon and no S-Video port)-their technical equivalents were the Japanese SCPH-3000, so for consistency should have been SCPH-3001 and SCPH-3002. Inconsistent numbering was also used for the Yaroze machines, which were based on SCPH-5000 and later 1001/1002 hardware, but numbered DTL-H3000, DTL-H3001, and DTL-H3002. Also, the first models (DTL-H1000, DTL-H1001, DTL-H1002) had problems with printf function and developers had to use another function instead. This series of machines had a reputation for CD drive problems – the original optical pickup sled (KSM-440AAM) was made of thermoplastic and placed close to the power supply, eventually leading to uneven wear that moved the laser into a position where it was no longer parallel with the CD surface.
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