JVC GR-FXM270A - Electronic Viewfinder (E. Vf) Adjustment; Horizontal Sync; PLL Adjustment; Centering

3-4
3.3 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT
Notes: Unless otherwise specified, all measurement points
and adjustment parts are located on E. VF board.
CENTERING
MAGNET
FOCUS
MAGNET
CRT
F.B.T
Fig. 3-3-1 E. VF
50E. VF PWB ASSY
VR4
BRIGHT
CN1
CN2
CRT-CN
VR1
V. SIZE
VR2
H. HOLD
Fig. 3-3-2 E. VF board
(a)
Fig. 3-3-3 Horizontal sync. 1
(b)
Fig. 3-3-4 Horizontal sync. 2
Subject •Camera picture
Mode •EE
Equipment •E. VF
Measurement point •E. VF screen
Adjusting part •VR1 (V. SIZE)
Specification • Normal picture amplitude
3.3.2 PLL adjustment
1) Observing the viewfinder screen, adjust VR1 for normal
picture amplitude.
Subject •Alignment tape
•Stairstep
Mode •PB
Equipment •E. VF
Measurement point •E. VF screen
Adjusting part •Centering magnet (CRT assy)
Specification • The center of the E. VF screen
3.3.3 Centering
1) While observing the viewfinder screen, adjust the centering
magnet to locate the stairstep in the center of the view-
finder screen.
Subject • Alignment tape
• Stairstep
Mode • PB
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR2 (H. HOLD)
Specification • The midpoint of the two
markings
1) Observing the viewfinder screen, turn VR2 fully clockwise
to make the picture unstable.
2) Slowly return VR2 counterclockwise to find a point where
the picture becomes stable, and mark this position.
3) Turn VR2 fully counterclockwise to make the picture
unstable in the same manner as 1) above.
4) Slowly return VR2 clockwise until the picture becomes
stable, and mark this position.
5) Finally set VR2 to the midpoint between the two markings
of 2) and 4).
3.3.1 Horizontal sync.