JVC GR-FX15EK Service Manual page 27

3.4.2 B/W VF ASSEMBLY (E. VF) ADJUSTMENT
Referring to "SEC. 2 SPECIFIC SERVICE INSTRUCTIONS" and
connect the E. VF WIRE to CN12 of the MAIN BOARD
ASSEMBLY.
(LY20701)
BOTTOM CASE ASSEMBLY
PARTS NO.
LY20701
NOTE:
• Unless otherwise specified, all measurement points and ad-
justment parts are located on E. VF BOARD ASSEMBLY.
• After adjustment or replacement of the deflection yoke or the
centering magnet, fix it by the band as shown the figure below.
TOP VIEW
CRT
Fig. 3-4-3
• After adjustment is completed, compare the picture on the E.
VF screen with the monitor TV.
CRT
Fig. 3-4-4
CN7002
6 0 E. VF PWB ASSY
VR7001
CN7001
V. SIZE
Fig. 3-4-5
1-24 (No.86712)
SERIAL NO. LABEL
SCREW
Fig.3-4-2
CENTERING
MAGNET
STOPPER
CENTERING
MAGNET
STOPPER
F.B.T
VR7003
FOCUS
T7001
VR7002
BRIGHT
3.4.2.1 Tilt
Subject • Alignment tape
• Stairstep
Mode • PB
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • Deflection yoke
Specification • The picture is visible as same as
monitor TV.
(1) Put the deflection yoke to the most inner side of CRT neck
first. Then fix the stopper temporary.
(2) Adjust the tilt of picture on the E. VF screen by tilting the de-
flection yoke.
(3) Fix the stopper completely.
3.4.2.2 Centering
Subject • Alignment tape
• Stairstep
Mode • PB
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • Centering magnet
(CRT BOARD ASSEMBLY)
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-find-
er screen.
3.4.2.3 Vertical scanning
Subject • Camera picture
Mode • EE
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR7001 (V. SIZE)
Specification • Normal picture amplitude
(1) Observing the viewfinder screen, adjust VR7001 for normal
picture amplitude.
3.4.2.4 Brightness
Subject • -
Mode • EE
• Lens closed
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR7002 (BRIGHT)
Specification • The CRT raster is just barely visible
(1) Close the lens with the cap and adjust VR7002 so that the
raster of the CRT is just visible in the E. VF.
3.4.2.5 Focus
Subject • Camera picture
Mode • EE
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part • VR7003 (FOCUS)
Specification • The center area is clear and defined
(1) While observing the viewfinder screen, adjust VR7003 so
that the picture at the central area of the screen is clear and
defined.