Roland JX-305 GROOVESYNTH Service Notes page 17

JX-305
2) Next, aligning the positioning bosses of RUBBER
SWITCH with the circular holes of SPACER, and as
done for the spacer, place four RUBBER SWITCH 12PL,
and one RUBBER SWITCH 13P in order, starting on the
lower tone side.
In this procedure, make sure that RUBBER SWITCH and
SPACER are positioned with their cutout parts and
ascape grooves aligned, respectively.
(Refer to fig. 3 and fig. 4.)
Cutout Part
Air-Escape Groove
3) Next, using the cutout part of PCB and the projecting part
of SPACER as positioning guide, place PCB so that the
positioning pin of SPACER fits into the positioning hole
of PCB. (Refer to fig. 5)
As fig. 6 shows, PCBs consist of three boards, "LOW"
and "HI".
PCB Cutout Part
32P LOW
Bass Side
fig.3
RUBBER SWITCH
Posisioning Boss(6 points)
PCB SPACER
Chassis
fig.4
Positioning Pin of SPACER
fig.5
Projecting Part of SPACER
29P HI
Treble Side
fig.6
4) Then, tighten the LOW and HI PCBs with the Tap Tight
Screws. First tighten the near-center Screws 1, then the
end Screws 2 on the other side. (This order must be
followd. Ohterwise the PCBs may not be flush with the
Spacers.)
Then tighten the remaining Screws 3 of the LOW and HI
PCBs. (For the above, refer to Fig. 7.)
Finally, tighten the Screws in the area adjacent to the
LOW and HI PCBs.
Since the PCBs may have been warped by soldering, etc.,
it is recommended to gently hole down the center and
tighten the Screws.
3
2
fig.7 (ex. 32P LOW)
2. REMOVAL AND REINSTALLATION OF THE KEYS
Before removing the keys, first take the stopper off the rear
side of the chassis, then take away the spring.
When reinstalling the keys, carefully apply the stopper as
shown in fig. 8.
Bring the stopper into closs contact with the ends of the white
key shafts and press the stopper in the area of the double-
coated tape to secure it. (Refer fig. 8.)
fig.8
Viewed from the rear side of the chassis.
32P LOW
STOPPER 12P x4
Sep. 1998
PCB Adjacent Area
1
Double-Coated
Adhesive Tape
Stopper
Normal
Sharp Key Axis
Key Axis
29P HI
STOPPER 13P
fig.9
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