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D-wW400
4. Bias Current Adjustment and REC/PLAY Output level Adjustment
Recording level
Frequency
| |
|
Adjustment |
fee : | Eevel | At
* OdB-
___, 20dB
;
—16dBm | ATT
~~ O0dB-
20dB
OdB-
. 20dB
" 0dB-
| 20dB
Playback level
| Tape select
switches
Adjustment
'Tape
procedure
Adjustment
Level
:
point
+1.5 dB +1.0 dB at 10 kHz
| compared with that at 1kHz
| +0.5 dB
+7.5 dB +1.0 dB at 10kHz |
| compared with that at 1kHz
| Normal tape
| NOR
iit
pit eae
ilo
tamer
| Normal tape
| NOR
| 1k/10k
ATT
R407L,R
(1)
'400
+
NOR
| 1k/10k
-
:
L
4 Chrome tape | CrO,
- 1k/10k
-1k/10k
R52L, R
Normal tape
ATT
To check
Within +3 dB
——.
' Within +3 dB
To check
| ATT
5 METAL tape METAL
To check
Adjustment procedure
(1) Bias Current Adjustment
1) Connect the audio generator to the LINE IN terminals
via the attenuator and set the unit to the record mode.
Adjust the output of the audio generator so that the
(2) REC/PLAY Output Level Adjustment
1) Connect the audio generator to the LINE IN terminals
to input a 400Hz signal and set the unit to the record
mode.
2)
3)
meter indicates 0 dB. Then, adjust the attenuator to
set it to 0 dB to —20 dB. (Frequency: 1 kHz)
Record in this state, and then set the frequency of the
audio generator to 10 kHz and record it.
Playback
the recorded
section, read the output and
check
that the reading at 10 kHz is +1.5 dB +1 dB
Adjust the output of the audio generator so that the
reading of the electronic voltmeter connected to the
LINE OUT terminals, is -16 dBm, and perform record-
ing.
2) Playback the recorded section and check that the out-
put is —16 dBm +0.5 dB.
compared with that at 1 kHz.
3)
4) When
it is not, adjust
R407L,R
properly,
repeat
recording/playback
in the same way to adjust so that
the output at 10 kHz is +1.5 dB + 1 dB compared with
that at 1 kHz.
When the output difference is out of +0.5 dB, adjust
R52L,R
properly
and
repeat
recording/playback
in
the same way to adjust so that the output difference is
within +0.5 dB.
"Perform checking only for Chrome and METAL tapes,
but when the output is not within the specified +3 dB,
perform adjustment using NORMAL tape again.
5. Cassette Chassis Inspection and Adjustment
Note1:
Pinch roller compression strength
Inspection item
Reference value
Remarks
| Pinch roller compression
Note 1
| strength
300—500g
| Playback torque
:
35—75g-cm
| 70-160g.cm
70—160g-cm
2.0—6.0g-cm or less
3.0-6.0g-cm
__
1105 + 15 sec or less
0.05—0.5mm
F F torque
REW torque
Pinch roller
Capstan
: Take up back-tension
;
Supply back-tension
LF F, REW time
Axial play of flywheel
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