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- Subject: Standard C508A mods
-
-
- top right-hand corner
-
-
- | | |
- | | +-----+
- | | o o |
- | | # | <- remove this SM component
- +-----+ o o | for cellular RX unlock
- |
- | |
- | |
- | // \
- | // \
- CPU | \
- | o o |
- | o o under /
- | o#o Lithium /
- | battery /
- -----+ |
- ^ |
- | |
- remove this SM (RD77) |
- component to extend |
- TX 115-164 & 400-464 |
-
-
- The following procedure involves removing the
- lithium battery which saves your memory channels.
- Note any memory channels you wish to save -- you
- will have to re-enter them. Also note the placement
- of the battery before you remove it, since you don't
- want to put it back in the wrong way.
-
- Remove the 4 screws from the back of the radio and
- separate the front and back pieces. Be careful not
- to damage the flexible cable connecting the two.
- Unsolder and remove the lithium battery, being careful
- not to short-circuit it. Remove the surface mount
- chip resistor RD77, at the fifth pin of the CPU chip,
- counting up from the bottom. Two component pads
- above it are already empty. To permit RX of cellular,
- also remove the surface mount component depicted in
- the diagram above, way in the upper right-hand corner.
- Resolder the lithium battery back into place, noting
- that the polarity is correct. Press the reset switch,
- and reattach the two halves of the radio. Place the
- batteries back in and power on.
-
- ---------------------------------------------------------
- From scottw@atlcom.net Mon Sep 30 14:48 MST 1996
- Subject: Revision of modification to model C-508A
-
- Seperate radio halves, DO NOT desolder lithium battery, use wood carving
- razor to remove SM. Razor must be long, sharp and thin at which point
- you can get up under the SM and pop off. Remove SM's and press reset
- button, reattach two halves. Place batteries back in and power on.
-
-
-