Periodic Check; Cleaning Of Rotary Drum Assembly; Cleaning Of Tape Path System; Periodic Checks - Sony DSR-250 Service Manual

5-2-2. PERIODIC CHECK

• Carry out the following maintenance and periodic checks not only to fully display the functions and performance of the set, but also for the
equipment and tape. After replacing, service the set as follows, regardless of the length of use.
2-2-1.

CLEANING OF ROTARY DRUM ASSEMBLY

1. Press a wiping cloth (J-12) moistened with cleaning fluid (J-
11) against the rotary drum assembly gently, and clean it while
rotating the rotary drum assembly slowly with your finger in
the counterclockwise direction.
Note: Do not rotate the motor on power or rotate the rotary drum assembly
in the clockwise direction with your finger. The head tip will also be
damaged if the wiping cloth is moved perpendicularly against it.
Therefore, be sure to follow the above instructions when cleaning
the rotary drum assembly.
Rotary
drum assembly
2-2-3.

PERIODIC CHECKS

Location of Maintenance
and Check
Cleaning of tape path surface
Cleaning and degaussing
of rotary drum assembly
Capstan (Bearing)
Driving
Gear
System
Cam motor (worm block)
Abnormal noise
Back tension measurement
Performance
Confirmation
Brake system
FWD/RVS torque measurement
Note: When overhauling, refer to the checks above and replace parts.
Note: Greasing
Always use the specified grease. If the viscosity differs, various
problems may occur.
(Use SG-941 for all parts of the R mechanism.)
Check the quantity of grease when installing the parts which is
needed to apply the grease. When replacing these parts, make sure
to apply the specified amount of grease.
• FOIL (SG-941): Part No. 7-662-601-39
Cleaning cloth
500 1000 1500 2000
a a a a
a a a a
– –
– –
– –
– –
– –
– –
2-2-2.

CLEANING OF TAPE PATH SYSTEM

1. Clean the tape path systems (TG1 to TG8 and capstan) and the
lower drum using a super fine applicator (J-13) moistened with
cleaning fluid.
Note: Make sure that no oil or grease of the link mechanisms sticks to the
super file applicator (J-13).
Note: Do not use a applicator moistened with alcohol to the other guide
cleaning. But clean the pinch roller using alcohol.
TG 3
TG 2
TG 1
Hours of Use (H)
2500 3000 3500 4000
a a a a
a a a a
– –
– –
– –
– –
– –
– –
: Cleaning
a
5-37
TG 4 TG 5 TG 6 Pinch roller
TG 8
Remarks
4500 5000
a a Be careful of the oil.
Be careful of the oil.
a a
–
Make sure that no oil gets
on the tape path surface.
–
–
X-3946-702-1 (M902)
–
–
–
: Appling grease
Capstan
TG 7
: Confirmation