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12.2 ELECTRICAL ADJUSTMENT
o Check the following points before starbing any
electrical adjustments.
1. All mechanical adjustments must be completed.
2. Clean the heads and demagnetize the REC/
PLAYBACK head.
3. Level measurements are based on 0dBv : 1V.
Connect a 50kg dummy resistor (47k- 52kSl)
across the OUTPUT terminals.
4. Use the specified test tapes for each adjust-
ment. Although test tapes have both A and B
sides, use the side with the lable (side A).
9. Proceed according to the specified adjustment
sequence. Changing the sequence can prevent
proper adjustments from being carried out, and
subsequently result in loss of performance.
Adiustment sequence
1. DOLBY NR level.
2. Head azimuth
3. Playback level
4. Playback equalization check
5. Record/playback frequency response
6. Recording level
7. Limiter effect check
L E V E L ( d B )
STD-341A
STD-608A
STD-603
STD-604
Playback adjustments
NORMAL blank tape
CrO2 blank tape
METAL blank tape
Prepare the following
measuring equipment.
AC millivoltmeter, audio oscillator, attenuator,
and oscilloscope.
Unless otherwise specified, always adjust for
both left and right channels.
Unless otherwise specified, adjust with the
DOLBY
NR
switch in the OFF position.
Let the deck warm up for a few minutes before
starting adjustments. Also leave the deck in
playback
and recording mode respectively
for 3 to 5 minutes before starting playback
and recording frequency response adjustments.
1 Oosec
1 Oosec
Sossc
1 Oosec
Fig. 12-5 STD-341A test tape
5 .
6 .
7 .
8 .
@
@
V R 2 0 1
V R 1 O 1
V R 5 O 1
V R 1 O 2
/ 4 .
^/A\
I^_l
(ltt!
i l g
l l 9 l
v
v------1 F=l
vR2o2
il F)l
ftril
o
tn
v o
r p
v '
l - 1
r p
( D o L . L )
| |
( D O L . R }
I J
Fig. 12-6 Adjustment points
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