UMAX Astra 4000U transparency adapter problem (by 2 users)

We recently purchased a UMAX Astra 4000U and a 4000U Transparency
Adapter. We want to scan dental x-rays. The platform is Windows 98, v.
4.10.1998, on a Pentium machine with 128 mb RAM.

The scanner will scan on the flatbed setting, but when it is set to
transparency (UTA), the scanner does not scan, and an error message is
generated: "00001500h". This happens either when VistaScan is activated
through another program or when it is activated directly.

The transparency adapter is unlocked. Its power supply is connected
and the connection to the base is secure. If I remove the glass and
gently move the head, the unit will repark when it is reassembled and
powered on. So it seems to be getting power. I never saw it light up,
even if I lifted the lid during a scan attempt.

It seems that the transparency adapter is a dud. In fact, I just
sent an email to UMAX support about this.

Does anyone have any suggestions? Thank you.

-- Margaret Nupponen