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Movement Check List For The Main Parts Of The Mechanism; How To Check The Mechanism Mode Position; Self-Diagnosis Display - Sony SVT-RA40 Service Manual

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2-2-2. Movement Check List for the Main Parts of the Mechanism

Mechanism mode
Principal parts
T brake assembly
S brake assembly
T soft brake assembly
S soft lever
BT lever assembly
BT spring
Pinch roller lever assembly
Clutch mounting assembly
Load lever assembly
Capstan brake assembly
S and T incline mounting assembly
Cleaner roller assembly
2-2-3. How To Check The Mechanism Mode
Position
You can tell which mode the mechanism is currently in by
looking at the codes and marking-lines on the crescent
slide on the underside of the mechanism chassis. The edge
of the crescent mounting is used as the reference line, as
shown in Fig. 2-2-2, and the marking-lines and symbols
indicating the mechanism modes are displayed on the
crescent slide, which slides against the edge of the crescent
mounting. The mechanism mode is read off from the
marking-line on the slide crescent which is aligned with
the reference-line on the crescent mounting.
Example: In Fig. 2-2-2, marking-line 6 is aligned with the
reference-line on the crescent mounting, so the mecha-
nism is seen to be in FF/REW mode.

2-2-4. Self-diagnosis Display

Some models are equipped with the SELF-DIAGNOSIS
DISPLAYS function.
Use it as a means of finding out the symptoms and cause of
the error before performing repairs.
For details, refer to the separate service manual for the
respective models.
SVT-RA40/RA168
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
DOWN/
UP/
UP
UP
UP
UP
DOWN
PLAY
PLAY
PLAY
PLAY
PLAY
UNLO
UNLO
UNLO
LO
OFF
OFF
OFF
OFF
LO
UNLO
OFF
OFF
OFF
(ON)
The edge of the
crescent mounting
is the reference-line.
2: R.STILL/R.SLOW
Crescent slide
(S): Strength
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON(W)
ON(W)
ON(S)
ON(S)
ON
OFF
ON
PLAY
PLAY
PLAY
PLAY
LO
LO
LO
LO
OFF
OFF
OFF
ON
(ON)
OFF
OFF
OFF
Crescent mounting
Fig. 2-2-2
(W): Weakness
OFF
ON
OFF
ON/OFF
OFF
ON
OFF
ON/OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON(S)
ON(W)
ON
OFF
OFF
ON
PLAY
FF
PLAY
LO
LO
LO
LO
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
6: FF/REW
4: BRAKE
(POWER OFF)
5: PLAY/ STOP/
REC
3: STILL/SLOW/
REC (INTERVAL)
2: IDLER
1: REVIEW
7: INITIAL
E: EJECT
2-9

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