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For replay adjustments
STD blank tape
Cr,Oz blank tape
METAL blank tape
cr-Fg|E'Cl
Adjustment Sequence
1. Head azimuth adjustment
2. Playback equalizer adjustment
3. Playback Ievel adjustment
4. Level meter OdB adjustment
5. Approximate adjustment of recording cunent
6. Erasure current adjustment
7. Bias trap adjustment
8. Approximate adjustment of recording bias
9. Recording equalizer and variable equalizer
adjustments
10. Recording and playback frequency response
adjustment
11. Recording level adjustment
12. Recording dolby NR adjustment
13. Playback dolby NR adjustment
14. Output level adjustment
S T D - 3 3 1 4
L É V E L ( d B )
9. ELECTRICAL ADJUSTMENTS
Before performing electrical adjustments, check
the following items.
1. Ensure that all mechanical adjustments have
been completed.
2. Adjust the measuring level to 0dBv = lV, and
place a 50kO (47kQ to 52kQ ) dummy resistor
across the line output terminals.
3. Perform adjustments using the A-side (the side
with the label) of the specified test tapes.
STD-331A :
For overall replay
STD-341A
STD.601
STD-603
STD-604
4. Obtain
the
following
measuring instruments.
Millivoltmeter,
low frequency generator oscillo'
scope, attenuator.
5. Unless otherwise defined, the term "recording
condition"
as used in this manual shall mean
the condition when a cassette shell is loaded, and
both the PLAY and REC switches are pressed.
6. Unless otherwise specified, adjustments shall be
performed on both L and R channels.
7. Clean the heads and also remove any residual
magnetism using a head demagnetizer.
8. Always
perform
adjustments
in the specified
sequence.
If
the
sequence is changed, the
performance of the unit may be degraded.
o
- 2 0
s T D . 3 4 1 A
L E V E L { d 8 )
5 O s a c
J O s c c
l O t a € l O r ? c
6 O r . c
l O 3 . c
3 O t a c
Fig. 9-1
Recorded contents of test tape
r O O s o c
t O O s c c
5 O s c c t O O r . c
3 3 3 H z
3 3 3 H 2
| l 4 k H r
2 5 k H i
I o t H r
8 r r u
6 3 r | t
9.1 HEAD AZIMUTH ADJUSTMENT
1. Connect the millivoltmeter to the OUTPUT
terminals.
2. Turn the OUTPUT level control to the maximum
position, and put the TAPE switch to STD.
3. Replay the -20dB part of the 10kHz test tone
on the STD-341A test tape. Turn the head
azimuth adjustment screw until the output
from both L and R channels becomes a maximum
(Fie. e-2).
4. After adjustment, apply lock paint to the adjust-
ment screw.
Screw driver
Adlustment screw
Fig. 9-2
Head azimuth adjustment
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