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Dolby NR circuit
Equipment:
* VTVM
« AF oscillator
* ATT
* Oscilloscope
Overall S/N ratio
Equipment:
« VTVM
* AF oscillator
* ATT
* Oscilloscope
* Test tape
(reference blank tape)
-+QZZCRA
VR9 VRIOL4
VR6
L3 VR5
MEASUREMENT & ADJUSTMENT
2kHz
= 3kHz
1OkHz I) kHz
Fig. 27
Place UNIT into record mode, set the Dolby NR switch to OUT posi-
tion and supply to LINE IN to obtain —34.5dB at TP3 (L-CH), TP4
(R-CH) (frequency 5 kHz).
Confirm that the value at IN position is 8(2.5)dB greater than the
value at OUT position of Dolby NR switch.
Test equipment connection is shown in fig. 19.
Supply 1kHz signal to LINE IN and adjust ATT so that output level at
LINE OUT indicates 0.65 V.
Make recording.
Make another recording without supplying signal (disconnect input plug
to LINE IN).
Rewind to recorded part and playback.
Measure output signal level and no signal level (noise), and determine
the ratio in decibels (dB).
The value is difference between "Playback S/N and overall S/N", but
for decibel calculation refer to "Playback S/N measurement" on page
D:
Standard value:
Greater than 43dB (without NAB filter)
TR3
VR3 VR1 TP1 i
RS-M33
RS-M33
REMARKS
* Record mode
* Input level control ---- MAX
« Record/playback mode
* Input level control ---- MAX
* Output level control
* Erase the tape with a bulk
tape eraser.
Tape speed adjustment VR. TP4 VR4 VR2 TP2
Fig. 28
TP6
L5
L6
TP8
NOTE: A indicates that only parts specified
by the manufacturer be used for sefety.
ELECTRICAL
PARTS
LOCATION
eno] | PartNo. |
Part Name & Description
ELECTRICAL
PARTS
El
WY456Z
For Ail European areas.
El M@| | wy1422z
Record/Playback Head
E7
E15
Record/Playback Head
*For Asia, Latin America, Middle East, Africa and Australia.
E2
QWY21227A
E3
QSLSOO2RF
E4
QEJ5002S
E5
QJA0249
E6
0JA0444H
E7
A| XAMQ34S600W
E8
A| QFC1204M
*For All European areas. except,
E8
| A| QFC1205M
* For United Kingdom.
E8
A} QFC1203M
For Asia, Latin America, Middle East and Africa areas.
E8
@|A|QFC1208M
For Australia.
E9
|QTW1118
*For Asia, Latin America, Middle East and Africa areas.
E10
OBA;
| QBJ1425
For All European areas and Au
E10 ®| |QTD1129
For Asia, Latin America, Middle East and Africa areas.
E11
QJP1921TN
E12
QJS1921TN
E13
QJT1054
E14
QJT0055
E15
QBG 1596
E16
QBM1251
E17
.
QXB0600
"Silver Type'
QXBO600K
"Black Type"
*For All European areas and Au
E17
| QXB0558
"Silver Type"
*For Asia, Latin America, Middle East and Africa areas.
E18
QMA3470
E19
0MA3471
E20
QMA3500
E21
QMA3472
E22
QMA3477
E23
QMA3469
E24
QMA3479
E25
QMA3328
E26
QMA3478
£27
QMA3204
E28
QNQ1039
£29
QNQ1004
E30
QNQ1070
E31
QWQ1133
E32
Qwo2002
E33
QBT1787
E35
XSNQ0004S
E36
QHQ1188S
E37
OHO1165S
E38
A\| XBAQ0007
*For All European areas.
E39
i XBAQ0003
For All European areas.
E40
A| XBAQ0008
* For All European areas.
E41
®|A|XBA2E03NS5
* For Asia, Latin America, Middle East and Africa areas.
E42
A|QTF1027
* For All European areas.
E43
A | QTF1054
*For All European areas.
£44
W|A|QTFI049
Erase Head
Fluorescent Level Meter
Pin Jack Board Assembly
Headphones Jack
Microphone Jack
E25
Pilot Lamp
AC Power Cord
United Kingdom.
"
"
Spark Killer Cover
Cord Bushing
stralia.
|
"
3 Pin Plug
3 Pin Socket
Contact
Connector Terminal
LED Holder
NS
SS a a
oe
Cushion
Power Switch Button
stralia.
"
'
t
|
i
'
Switch Lever
!
Record Lever
!
Adjustment Angle
! E12
Transformer Angle
\
Volume Angle
Jack Board Angle
Microphone Jack Angle
E
\
mee
ee
ae
es
we
ee
oe
ee ee
ee
ee
E36
E37
E19
Seen
eee
Headphone Jack Angle
Meter Holding Angle
Power Switch Angle
Nut 9¢
Nut 8¢
i
fo soe
=
et
. Witine
7
Nut 10¢
:
ue
ta
il
Jy
Washer 9¢
i
a
Br
:
Washer 8¢
Lock Lever Spring
Screw
7
7 America, Middle
1
ae
a
ee
ae Ze
East and Africa areas.
For All
European areas. ;
"
E43
"
E39
E40
For
All
European areas.
E21
Fuse-400 mAT
Fuse-500 mAT
E45
* For All European areas
and Australia.
Fuse-630 mAT
Fuse-300 mAT
E44?
America, Middle
E41)
East and Africa areas.
E48
E38 For All European areas.
E42
Fuse Holder
For Asia, Latin America, Middle East and Africa areas.
E45
DBA
QTD1164
For All European areas and Au
E46
RUV387ZB
E47
QMA3558
£48
QMA3669
*For All European areas.
E49
|
|QMA3418
Cord Clamper
Stralia.
Voltage Selector Cover
Voltage Selector Angle
Fuse Holder Angle
qu"
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