4.3.5 Phase of control head (X value)4.4 ELECTRICAL ADJUSTMENT
Note:Electrical adjustment is performed by using a personal computer
Remove the exterior parts attached to the UPPER CASEand software for SERVICE SUPPORT SYSTEM. Read RE-
ASSEMBLY so that the screws around the A/C HEADADME.TXT file to use the software properly.
ASSEMBLY can be tighten or loosen.As for the connection of cables, see "4.2 JIG CONNECTOR
(1) Connect the JIG CONNECTOR CABLE to CN25 on theCABLE CONNECTION".
MAIN BOARD ASSEMBLY.
4.4.1 B/W VF ASSEMBLY (E. VF) ADJUSTMENT
(2) Playback the SP stairstep signal of the alignment tape and
Referring to ?SEC. 3 DISASSEMBLY? and connect the E. VF
observe signal at V_TP_FM with external trigger from
WIRE to CN12 of the MAIN BOARD ASSEMBLY.
V_FF on the JIG CONNECTOR CABLE.
(3) Operate the tracking button in the center and manual(LY20701)
tracking mode by pressing the tracking (+) and (-) buttonsBOTTOM CASE ASSEMBLY SERIAL NO. LABEL
and confirm that the FM output level is maximum at
the center position as shown in Fig. 3-3-9.
(4) If necessary, slightly loosen the setscrews D and E and
insert the Tweezers into the notch and guide hole to move
the A/C HEAD fully in the direction of the capstan to the
extent.
(5) Gradually move the A/C HEAD toward the drum to find the
PARTS NO.
position where the FM output level maximum for the firstSCREW
LY20701
time (a? - b? in Fig. 3-3-9).
Fig.3-4-2
(6) Fine adjust the phase of the A/C HEAD and tighten the
screws D and E at the point a.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
INSERT THE centering magnet, fix it by the band as shown the figure below.A/C HEAD
TWEEZERS
TOP VIEW
CENTERING
CRTMAGNETSTOPPER
SCREW D
SCREW E
Fig.3-3-8Fig. 3-4-3
? After adjustment is completed, compare the picture on the E.
AVF screen with the monitor TV.
ADJUSTING
POINTB
CENTERING
CRTMAGNETSTOPPER
MAX
FM OUTPUT
ZERO
F.B.T
DIRECTION OF CAPSTANDIRECTION OF DRUM
A/C HEAD PHASE
Fig.3-3-9Fig. 3-4-4
VR7003
FOCUS
CN7002
T7001
VR7002
BRIGHT
VR7001
V. SIZECN7001
Fig. 3-4-5
(No.YF016)1-19 |
ACEC
