JVC HR-XV28SEF, Service Manual

Page: 25 / 131

(No.YD068)1-25
4.3.6 Audio/Control (A/C) Head Adjustment
4.3.6.1 Prior Adjustment (performed only when no audio output appears in play of the standard test tape)
Purpose of adjustment : To ensure that audio and control signals can be recorded and
played according to the contract tract by constantly maintaining
distance between tape and head, and tape tension between the P3
post and the P4 post.
8.3
Fig. C-5-1
Fig. C-5-2
Fig. C-5-3
A/C Head Base
Height Adjustment
Screw(B)
Tilt Adjustment
Screw(C)
Azimuth
Adjustment
Screw(A)
X-Value Adjustment
Hole
A/C Head
Tape
Tape
0.2~0.25mm
P4
A/C Head Assembly
Adjustment Procedure/Adjustment Diagrams
1) Basically use the A/C head assembly adjusted as in
SPEC.
2) Check there is crumpling and folding of the tape around
the A/C head. If it is, Turn and adjust the tilt adjusting
screw to ensure that the tape corresponds to the bottom
guide of the P4, and recheck the tape path after proceed-
ing play for 4-5 seconds.
3) Where the tape bottom is not equal to Fig. C-5-3, Adjust
the height by using the height adjusting screw (B) and
then readjust it by using the tilt adjusting screw (C).
CAUTIONS
Fixtures and tools used VCR (VCP) status Adjustment position
Blank Tape
Driver (+) Type 5mm
Play the blank tape
Tilt adjusting screw (C)
Height adjusting screw (B)
Azimuth adjusting screw (A)
Fixed Screw
Always check the height of the A/C head since most ideal
height of A/C head can be obtained when the bottom part
of the tape is away 0.2 ~ 0.25mm from the bottom part of
the A/C head.