Philips DVP721VR Service Manual page 95

PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION
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:
Phenomena
Color beat Pollution of Full-Erase Head
S/N, Color Faded
Pollution of Video Head or
Horizontal, Vertical Jitte
Tape Transport System
Pollution of Audio/Control
Poor Sound, Low Sound
Head
No tape wound or tape
wound loosely. Pollution of Pinch Roller or
FF or REW impossible, Belt Capstan Belt
or slow turning
Deterioration of Clutch
Assembly D37 Torque
Tape loosely wound in
REV or Unloading
Pollution of Drum and
Traveling Device
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.
* No. (1) ~ (12) shows sequence that the tape moves from the supply reel to the take-up reel.)
(3) F/E Head
(5) Drum Assembly
(Video Head)
(4) Base Assembly P2
(2) Tension Post
(1) Supply Reel
4-19
Checking Points and
Cause
Pollution of Video Head
Fig. C-9-3 Tape Transport System
Replace-
ment
F/E Head
o
o
Video Head
o
A/C Head
o
Pinch Roller
Belt Capston
o
Clutch
o
Assembly A37
Fig. C-9-3
Fig. C-9-1 TOP VIEW
Fig. C-9-2 BOTTOM VIEW
(6) Base Assembly
P3
(7) A/C Head
(8) P4 Post
(10) Pinch Roller
(11) Take-up Guide
Post
(9) Capstan Shaft
(12) Take-up Reel