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C T - 1 2 " 7 0 W R C I
Recording/Playback sliding SW stroke adjustment
(Confirmation of noise generation when
R E C ^ STOP)
While loading the S T D - 6 0 5 A
onto D E C K 2,
confirm whether it generates noise or not when it
is put into S T O P state from R E C state.
I n
the event noise is generated, replace the
SW connection spring by applying it as shown in
F i g . 11-4. (Be sure that the slide SW is fully pulled
when in the R E C state, and it has retumed com-
pletely when i n the S T O P state.)
SW connection spring
Switching lever
D E C K 2 ,
0 ^
Front side
c
When noise is generated
or the slide SW connect
be pulled completely.
When the slide SW does
not return fully.
Standard position
Fig. 11-4 Recording/Playback sliding SW stroke adjustment
(Confirmation of noise generation when R E C ^
STOP)
11.2
E L E C T R I C A L A D J U S T M E N T S
Adjustment Conditions
1
1 . T h e mechanical adjustments must be
com-
pleted first.
2. T h e head must be cleaned and demagnetized.
3. A l l o w the deck to age for at least a few minutes
before commencing any electrical adjustments.
4. T h e reference signals is O d B v = l V r m s .
5. Connect a 50 kilo-ohm (or between 47 to 52
kilo-ohm) load resistance to the O U T P U T termi-
nals.
6. Unless otherwise specified, the switches listed
below are left in the positions indicated.
D O L B Y N R
: O F F
T A P E S E L E C T O R
:
N O R M
Test Tapes
S T D - 3 3 1 B
: Playback adjustments
_
_
(See F i g . 11-5)
'
S T D - 6 0 8 A
: N O R M A L blank tape
S T D - 6 2 0
: C r 0 2 blank tape
S T D - 6 1 0
: M E T A L blank tape
List of Adjustments
Deck I
1. Head azimuth adjustment.
2. Playback frequecy response check.
3. Playback level adjustment.
4. Playback time constant switching check.
Deck II
1 . Head azimuth adjustment.
2. Playback frequency response check.
3. Playback level adjustment.
4. Playback time constant switching check.
Erasure current adjustment
6. Recording bias adjustment.
7. Recording level adjustment.
8. Recording and playback frequency
response
check.
9. Copy mode frequency response check.
10. Level meter check.
3kHz -•Hx
J k ^
I I H I SOOHI 2S0HI
zyxwvutsrqponmlkjihgfedcbaZYXW
M^HZ
S3HI
i O H l
Fig. 11-5 Contents of the test tape STD-331 B
3 6
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