Kelly, It would have been nice, had you included those seven numbers in your posting. But, by your description, I think you have either the TPN1105A or TPN1106A power supply. The model number is usually stamped on a box that is immediately below the large black transformer. The TPN1105A operates only on 120 VAC 60 Hz, while the TPN1106A can operate on either 120 VAC or 240 VAC, and 50 or 60 Hz. I believe that you have one of these units, because your description of a "squeal" as it starts tells me that it incorporates a switching power supply circuit. Earlier units were linear in design, and made no such noise.
Either of the above units may be equipped with Option C29, called the Battery Protection & Alarm option. This provides a relay closure when AC power fails, and it also injects a periodic beep into the audio to alert the users that it is on battery power. The C29 option also can lower the PA power when on batteries, and shut down the repeater when the battery voltage falls below a safe level. These power supplies can be adjusted, with an internal pot, to float nicad batteries at 14.25 VDC or lead-acid batteries at 13.0 VDC. Before connecting your power supply to any batteries, you should check and/or adjust the voltage to the proper level using an accurate DVM. Most MICOR stations installed with battery backup used Motorola nicad batteries rather than lead-acid, so don't assume that the voltage is set for the latter. Obtain Motorola publication 6881104E92 for operation and service information. 73, Eric Lemmon WB6FLY [EMAIL PROTECTED] wrote: > > I have acquired a couple of the Micor Power Supplies with the Battery > Charger. Now I asked the local Motorola shop about purchasing a service > manual. They > are more than happy to help, but need the typical xxxyyyyz part number. Well, > there are 7 such numbers stamped on various places of the unit. These are > probably subassembly part numbers. > > Let me describe the thing and no doubt some of you will recognize it. It is > heavier than other Micor power supplies, has a larger heat sink, and squeaks > when powered up. There is apparently an audio signal and PTT(can I use that > acronym anymore) to indicate battery mode, and a low voltage shutoff > adjustment. > I'd really like to make use of these features. Do any of you recognize it? If > you do I need to order a service manual for this model. If you happen to have > a > manual that could be parted with, please let me know. > > Kelly Fowler, KE4ADV > > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
