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

3.3 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT

Notes: Unless otherwise specified, all measurement points
and adjustment parts are located on E. VF board.

CENTERING

CRT MAGNET
Fig. 3-3-1 E. VF
CRT-CN
5 0 E. VF PWB ASSY
CN2
Fig. 3-3-2 E. VF board
3.3.1

Horizontal sync.

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
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).
FOCUS
MAGNET
F.B.T
VR4
VR1
BRIGHT
V. SIZE
VR2
H. HOLD
CN1
markings
Fig. 3-3-3 Horizontal sync. 1
Fig. 3-3-4 Horizontal sync. 2
3.3.2

PLL adjustment

Subject • Camera picture
Mode • EE
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR1 (V. SIZE)
Specification • Normal picture amplitude
1) Observing the viewfinder screen, adjust VR1 for normal
picture amplitude.
3.3.3 Centering
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
1) While observing the viewfinder screen, adjust the centering
magnet to locate the stairstep in the center of the view-
finder screen.
(a)
(b)
3-4