Yaesu FT-890 Operating Manual page 43

Installing Internal Accessories
0
Place the transceiver topside-up so that the
Fig. 4: Top CoverIHeatsink Removal
rear panel is facing you, and remove the four
9
6
screws indicated in Figure 4.
O Now turn the transceiver onto its right side
(as viewed from the rear). Lift the re& of the
top cover/heasink about 2 cm
(74
inch), then
slide it back slightly and begin to fold away
the uppermost side. Using care to unhook the
coaxial cable that was disconnected above
from the RF Unit, fold the two halves of the
chassis apart until they lay flat, side by side.
O Remove the four screws affixing the shield
cover over the Local Unit (Figure 5). Then
remove the tape (3 places) holding the cable to
the shield cover, and remove the shield.
0 To access the solder side of the Local Unit, first
remove the tape holding the wire harness to
the top of the VCO housing (with 4 holes in it
8 Q
- see Figure 6). Then disconnect the connec-
tors at points 1 through6, and the ribbon cable
Figure 5: Local Unit Shield Cover
at point A, by gently prying up each side of
the connector as shown in Figure 3.
0 Remove the seven screws shown in Figure 7
(note that one is next to the DVS-2 jack on the
rear panel), and also remove the upper one of
the two screws on either side of the front
panel (Figure 8, next page), and loosen the
lower one (on each side), allowing the front
panel to be folded forward so that the Local
Unit can be lifted as shown in Figure 9 (next
page).
IJ
Referring to Figure 9, locate capacitor C1323
and resistor R1361 on the board just behind
the oscillator housing. Cut the leads of these
parts and remove them.
O Straighten the leads on the TCXO-3 module, if
necessary. Then position it so that the trimmer
Figure 6: Local Unit Connectors
Figure
7:
Local Unit Screws
RIBBON CABLE
page
37