Sony Betacam SX DNV-5 Maintenance Manual page 142

3-3-20. Threading Arm Assembly Replacement
Removal
1. Tension regulator band assembly
removal
(Refer to section 3-3-12.)
2. Tension regulator assembly removal
(Refer to section 3-3-12.)
3. Threading arm assembly removal
Remove the stop washer, then remove the
threading arm assembly.
n
The S arm spring is also removed simultaneously
with when the threading arm assembly is re-
moved. Be careful not to lose it.
Installation
4. Threading arm assembly installation
(1) Apply oil (of 1/4 drop) to the shaft of the MD
chassis.
(2) Install the S arm spring in the boss and hole
"b" of the threading arm assembly.
(3) Put the bearing of the S drawer arm in the
guide hole while passing hole "a" of the
threading arm assembly through the shaft.
(4) Put the hook of the S arm spring on the dowel
of the MD chassis.
(5) Install the threading arm assembly with a stop
washer.
5. Tension regulator assembly
installation
(Refer to section 3-3-12.)
6. Tension regulator band assembly
installation
(Refer to section 3-3-12.)
7. Tension regulator (S5) guide cleaning
(Refer to section 3-3-12.)
8. Threading arm assembly (S4) guide
cleaning
Clean the threading arm assembly (S4) guide with
cleaning cloth moistened with cleaning fluid.
After cleaning, wipe the threading arm assembly
(S4) guide with dry cloth.
3-92
Hole a
Guide hole
Boss
Threading arm
assembly
S arm spring
Dowel
Shaft (Apply oil)
Bearing of the S
drawer arm
Stop washer
Hole b
DNV-5
DNW-7/90/90WS