Case Disassembly & Pcb Access; Lcd & Control Unit Access; Lithium Backup Battery Replacement; Panel Lamp Replacement - Yaesu FT-2500M Technical Supplement

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LCD Control Unit Access
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To access the Control Unit and Display Unit
first remove the VOL, SQL and dial knobs by
gently pulling them outward.
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Next remove two screws from each side of the
top cover and one from the rear. Tilt the rear of
the cover upward, then slide it out from the
chassis. Note that the single rear screw is dif­
ferent from the other four, be sure to reinstall it
in the correct location. Be careful not to lose the
plastic plug covering the cable entrance cutout
in the chassis.
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Remove the two hex bolts from the front panel
using a 3.5 hexagonal driver, then gently
mm
loosen the front panel.
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Remove the two flat ribbon cables by using a
small screwdriver or fingernail to slide the
release clamps forward on both sides of the
cable connector. After releasing both cables,
gently separate the front panel from the main
chassis and place it on a soft surface to prevent
the clear display from marring.

Lithium Backup Battery Replacement

The lithium backup battery should not require
servicing for a period of several years, however,
to replace the cell, order Yaesu P I N Q9000552.
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First note the location and tab polarity of
BT2001, mounted over the CNTL Unit micro­
processor. To remove the old cell, carefully
unsolder each terminal from the CNT L Unit
PCB and lift it free.
Dispose of lithium batteries according to regula­
tions in your area, and ensure small children can­
not play with or accidentally ingest the battery.
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Mount the replacement cell similarly, observ­
ing proper polarity when installing it. Next,
place the plastic insulating seal (P /N
R8118690) on top of the cell by peeling back the
cover to expose the adhesive backing, then
pressing it in place.

Panel Lamp Replacement

The LCD and controls are illuminated by four
10-V incandescent miniature lamps. If these re­
quire replacement, they can be ordered from your
Yaesu dealer (P /N Q1000083).
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First remove the front panel as previously de­
scribed. Note the location of the four lamps, as
indicated below.
'fr: W/Spacer
.... : W/O Spacer
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To remove a failed lamp, use a low wattage
soldering iron and forceps to unsolder and
free each lead, then gently lift the bulb out of
the hole.
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