Oki PM 3410 -- Revisions 'A' and 'B' Power Supply Replacement

A Pacemark 3410's revision level is given by the fourth character of the printer's serial number. If you have a revision 'A' or 'B' printer that needs a power supply replacement, you'll have to get a revision 'C' power supply (P/N 42312551); the earlier revisions are no longer available. There's an issue of connector compatibility that arises with that; there are two ways to deal with it.

a) Replace the two cables that connect to the power supply with revised, compatible cables. The part numbers are 41998701 (9 pin cable) and 41998801 (13 pin cable).

Obtaining those cables might be problematical. We tried recently to get a set, and Oki couldn't come up with them.

b) Swap the two connectors involved on the power supply. The circuit boards are of simple, cheap construction without thru-connects, so it's very easy to unsolder components without harm to the board.

- - -

The mechanism has to come out of the chassis pan for access to the power supply. Proceed as follows:

1) Access Cover
- Tip it up from the rear. When it's fully opened, it can come away.

2) Platen Knob

3) Pull-Up Roller Assembly
- Open the upper rear acoustic cover.
- Tip the pull-up roller assembly rearward to unclip it.

4) Top Cover
- Two M4x10mm bright pan head screws w/captive washers at the rear.
- Tip the cover up from the rear and it unhooks easily from the front.
-NOTE: The two nuts for the M4 screws sit loose in pockets. They're easily dislodged and lost. Best to remove them with a magnet and keep them with the screws.

5) Ribbon Cartridge

6) Control Panel w/Sheet Metal Mount
- One ZIF cable connection -- CN10.
- Five M3x6mm washerhead screws.
- Two cable connections -- CN11 and CN12.

7) Mechanism Cabling
- Two cable connections high up on interface connector PCA -- CN102 and CN103.
- Line feed motor connection at lower right of PCA -- CN9.
- Fan connection -- CN8. Check that this cable is free of other cabling.
- Two carriage motor connections -- CN1 and CN5.
- Carriage cable connection at upper edge of PCA -- CN2.
- Cable connection at lower left side of PCA -- CN4.

8) Mechanism
- Mechanism base fasteners -- three M4x12mm pan head screws w/captive washers, plus three steel clamp-plates. A magnetic retrieval tool is helpful.
- Mechanism rear edge fasteners -- three M4x8mm pan head screws w/captive washers.
- The mechanism is free to be lifted out of the chassis pan.

9) Power Supply
- Two cable connections.
- Four M4x8mm pan head screws w/captive washers.
- The unit's rocker switch, and a sheet metal projection at the lower right rear can be a bit of a hindrance to unit removal. Lift the left side end of the power supply slightly and it comes out easily.

- - -

If you have the replacement cables, it's pretty obvious how the old cables are removed and the new ones are installed.

If you're swapping connectors, the connectors can be removed without dismounting the circuit boards from their frames. To dismount a circuit board to make connector installation easier, remove the insulation sheet and six screws. There are two cable connections to be disconnected.

# # #

FEEDBACK

# # #