JVC GR-SXM250US, Service Manual

Page: 25 / 75

(No.86721)1-25
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.
Fig.3-4-2
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.
Fig. 3-4-3
• After adjustment is completed, compare the picture on the E.
VF screen with the monitor TV.
Fig. 3-4-4
Fig. 3-4-5
3.4.2.1 Tilt
(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
(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
(1) Observing the viewfinder screen, adjust VR7001 for normal
picture amplitude.
3.4.2.4 Brightness
(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
(1) While observing the viewfinder screen, adjust VR7003 so
that the picture at the central area of the screen is clear and
defined.
SERIAL NO. LABEL
BOTTOM CASE ASSEMBLY
PARTS NO.
LY20701
SCREW
(LY20701)
CENTERING
MAGNET
CRT
TOP VIEW
STOPPER
CENTERING
MAGNET
CRT
F.B.T
STOPPER
VR7001
V. SIZE
VR7002
BRIGHT
6 0 E. VF PWB ASSY
CN7001
T7001
CN7002
VR7003
FOCUS
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.
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
Subject • Camera picture
Mode • EE
Equipment • E. VF
Measurement point • E. VF screen
Adjusting part
• VR7001 (V. SIZE)
Specification • Normal picture amplitude
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
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