Thanks for the voltage measurements. That circuit does look like the power supply for the piezoactuator. However, it appears that I was wrong about the "transformer" -- it is probably just an ordinary inductor. The circuit topology is hidden inside the motor controller, but is probably similar to this (WD20PURZ-85GU6Y0, 2060-771945):
Attachment:
IMG_5100-1.jpg [ 876.29 KiB | Viewed 17243 times ]
https://groups.google.com/group/datarecoverycertification/attach/29cc96b30fbc6/IMG_5100.jpg?part=0.1&view=1Those two 4MB flashes have identical contents, but they are mostly empty. Most of the data consists of 0x400-byte blocks with an "HGl" or "HG" header.
The first 0x200 bytes appear to contain two 16-byte values (keys ?) at offsets 0xF0 and 0x1F0.
Code:
Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00000000 00 00 00 00 AD CB BC DA 02 00 00 00 11 00 00 00
00000010 00 00 CC 00 00 00 00 00 01 06 02 00 06 00 00 00
00000020 10 00 00 00 40 03 00 00 06 00 02 00 01 01 00 00
00000030 00 00 00 00 B8 03 00 08 04 04 10 01 10 00 00 00
00000040 3F 08 11 1F 40 03 00 00 00 01 00 01 00 01 00 00
00000050 3F 06 00 00 50 03 00 00 40 03 00 00 06 00 02 00
00000060 01 01 00 00 01 00 00 00 B8 03 00 08 04 04 10 01
00000070 50 03 00 00 80 06 00 00 00 01 00 01 00 01 00 00
00000080 3F 06 00 00 6A A3 BA 52 00 00 00 00 00 00 00 00
00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000A0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000C0 00 00 00 00 00 00 00 00 C0 99 58 01 00 00 00 00
000000D0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000E0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000000F0 90 FF 5E D3 64 B4 EC 99 26 38 5E 17 03 A5 68 69
00000100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000110 00 00 00 00 00 00 00 00 00 00 00 00 C0 99 58 01
00000120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000130 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000140 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000150 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000160 C0 99 58 01 00 00 00 00 00 00 00 00 00 00 00 00
00000170 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000180 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000190 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000001A0 00 00 00 00 C0 99 58 01 00 00 00 00 00 00 00 00
000001B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000001C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000001D0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000001E0 00 00 00 00 00 00 00 00 C0 99 58 01 00 00 00 00
000001F0 8A 70 64 68 F7 24 82 47 AC A5 33 84 88 90 5E 5C
The boot block in the main ROM appears to contain a 0x100-byte signature at 0x1F08 - 0x2007.