Maintenance And Inspection; Cleaning; Lubrication; Suggested Servicing Schedule For Main Components - JVC HR-S6950EU Service Manual

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1.7 Maintenance and inspection

1.7.1 Cleaning

Regular cleaning of the transport system parts is desirable but
practically impossible. So make it a rule to carry out cleaning
of the tape transport system whenever the machine is serv-
iced.
When the video head, tape guide and/or brush get soiled, the
playback picture may appear inferior or at worst disappear, re-
sulting in possible tape damage.
Note:
• Absolutely avoid sweeping the upper drum vertically as
this will cause damage to the video head.
(1) When cleaning the upper drum (especially the video head),
soak a piece of closely woven cloth with alcohol and while
holding the cloth onto the upper drum by the fingers, turn
the upper drum counterclockwise.
(2) To clean the parts of the tape transport system other than
the upper drum, use a piece of closely woven cloth or a
cotton swab soaked with alcohol.
(3) After cleaning, make sure that the cleaned parts are com-
pletely dry before using the cassette tape.
A/C head
Fig. 1-7-1a

1.7.2 Lubrication

With no need for periodical lubrication, you have only to lubri-
cate new parts after replacement. If any oil or grease on con-
tact parts is soiled, wipe it off and newly lubricate the parts.
Note:
• See the "mechanism assembly" diagram of the "parts list"
for the lubricating or greasing spots, and for the types of
oil or grease to be used.
1-10

1.7.3 Suggested servicing schedule for main components

The following table indicates the suggested period for such
service measures as cleaning, lubrication and replacement. In
practice, the indicated periods will vary widely according to en-
vironmental and usage conditions. However, the indicated com-
ponents should be inspected when a set is brought for service
and the maintenance work performed if necessary. Also note
that rubber parts may deform in time, even if the set is not used.
System
Tape transport
Drive
Video heads
Other
C : Cleaning
X : Inspection or Replacement if necessary
1.8 Servicing items related to video navigation
The video navigation function built into this unit works by stor-
ing the video navigation data in the internal EEPROM and writ-
ing data in the cassette tape simultaneously.
The video navigation data stored in the EEPROM cannot be cop-
ied to another EEPROM. Therefore, when the circuit board mount-
ing the EEPROM is replaced, the original EEPROM should be
mounted on the new board. This will make the user's video navi-
gation data usable with the new circuit board after replacement.
However, the user's data cannot be restored if the EEPROM on
the original circuit board is damaged.
Note:
• If the circuit board mounting the EEPROM or the EEPROM
alone has been replaced, it is required to perform confir-
mation/re-adjustment on all of the adjustment items us-
ing the EVR as well as those which are adjusted by trans-
mitting adjustment codes from the Jig RCU.
Digitized in Heiloo Netherland
Operation hours
Parts name
1000H
Drum assembly
A/C head
Pinch roller arm assembly
Full erase head
Tension arm assembly
Capstan motor (Shaft)
Guide arm assembly
Capstan motor
Capstan brake assembly
Main brake assembly
Belt (Capstan)
Loading motor
Clutch unit
Worm gear
Control plate
Rotary encoder
3/28/2017
2000H
C,X X
C,X C,X
C C
C C
C C
C C
C C
X
X
X
X X
X
X
X
X
X