Zenith XBV 443, Service Manual

Page: 88 / 108

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
4-19
(3) F/E Head
(5) Drum Assembly
(Video Head)
(4) Base Assembly P2
(2) Tension Post
(1) Supply Reel
(6) Base Assembly
P3
Phenomena
Replace-
ment
Checking Points and
Cause
Color beat Pollution of Full-Erase Head o
S/N, Color Faded Pollution of Video Head o
Horizontal, Vertical Jitte o
CAUTIONS
If operation of the position with (O) mark is abnormal even
after removing cause, replace it with substitute product since
it shows damage or wearing.
(7) A/C Head
(8) P4 Post
(10) Pinch Roller
(11) Take-up Guide
Post
(9) Capstan Shaft
(12) Take-up Reel
* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)
Fig. C-9-1 TOP VIEW
Fig. C-9-2 BOTTOM VIEW
F/E Head
Video Head
A/C Head
Pinch Roller
Belt Capston
Clutch
Assembly A37
Fig. C-9-3 Tape Transport System
Pollution of Video Head or
Tape Transport System
Poor Sound, Low Sound o
Pollution of Audio/Control
Head
o
Pollution of Pinch Roller or
Belt Capstan Belt
No tape wound or tape
wound loosely.
FF or REW impossible,
or slow turning
Deterioration of Clutch
Assembly D37 Torque
Pollution of Drum and
Traveling Device
Tape loosely wound in
REV or Unloading
o
Fig. C-9-3
1. Checking Points prior to Repair
Following abnormal phenomena may be repaired by
removal of foreign materials and oil supply. Check oiling is
required at the checking set or cleaning status is complete.
Determine that necessity of checking and repair the set
exists after checking the using period of the set together
with the user. In this case, followings must be checked: