As removed from a NAD CD Player Model: 5255
This NAD model was released to the market in the early 1980's
The lovely Toshiba OPH-32 laser head has failed and I have discovered they are EXTREMELY difficult to find replacements for, so the complete machine has been parted out.
This is the complete (fully functioning other than the laser head) CD mechanism, nothing has been removed and this includes the front NAD 5255 CD metal fascia panel.
Although the OPH-32 laser head can be very difficult to find, this mechanism remains a great source for the 3 motors, front panel plate etc and I am pretty sure these mechanism's are used in other NAD equipment (5200) plus Luxman, Nikko, NEC, Onkyo to name a few others.
NAD CD Player 5255
Complete CD mechanism (OPH-32 head)
NAD extensively used Toshiba product in this equipment, and this mechanism is no exception - the head is a Toshiba OPH-32
COSMETIC CONDITION:
There is no physical damage to any of the CD mechanism components, no stripped gears or other damage.
All items are clean
Front fascia panel is in good condition, light marks on the front and one very small dot of white just above the Compact Disc logo.
This would have to be one of the heaviest CD mechanisms I have come across lately, only beaten by the Revox B series and Studer Professional CD mechanisms (swing arm type)
This unit weighs just shy of 2Kg
Measures (when the door is closed): 300mm length x 210mm wide x 80mm height. This is due to the extensive use of steel in the framework, this is one very rigid mechanism, completely unlike elcheapo plastic jobbies.
TESTING:
The OPH-32 is not doing it's job - the spindle motor turns on, disc rotates, laser pops up and down attempting to read the TOC - makes 3 attempts and then shuts down.
I have made no attempt to adjust the laser power/focus settings, pretty foolhardy without the correct test equipment anyway.
Removal from the 5255 is easy. Remove all plugs from the mainboards, remove two rear base screws (supplied) and a sideways tipping movement of the mechanism will release the latches from the base of the equipment. Job done.
The laser unit is easy to access (remove cover plate underneath) and it is VERY large (70mm x 90mm module)
I manually moved the head worm drive from the "normal" rest position, all good because when it is powered up, the laser head always returns to the start position, ready to attempt a TOC read.
Laser tracking motor is marked as an RF-510T (same as the tray motor)
Tray motor is functioning fine (marked RF-510T)
Tray belt is fine
Spindle motor is a bit hard to reach/read but I can see it is a Sanwa Electric motor
Front fascia panel (with NAD 5255 screen printed on it) is easy to remove, Gently but firmly pull outwards and upwards and it will release from the plastic body of the mechanism.
End of path microswitch is operating fine (open switch and prone to dirt, now cleaned)
None of the interconnect wiring (no ribbon cables here, all discrete wires) are cut, terminated in plugs for connection to the main board - no soldering at all.
If someone found a replacement OPH-32 laser head and put this mechanism back to work, it would be sensible to replace the tray belt, clean off the old silicon grease on the tray gears and worm drive gears (one metal and one plastic)
I do NOT have the schematics for this CD mechanism
Upon removal from the 5255, stored safely in sealed ESD plastic., tray closed-locked and all leads tied up.
