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Hitachi D-980 Service Manual

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Page 11

English
3. Source monitor level adiustment
Setting: Playback mode
Connection:
3 Monitorpegel (Vorbandkontrollel
E instellung: Wiedergabe
Anschlibse:
D-980
3. Réglage de niveau de contr6le de
soufce
Réglage: Mode de lecture
Branchement:
Adjustment: Feed a 400 Hz signal
into LINE lN. Adjust the Record
level control or the signal generator
so that output voltage at TPl L, R
is 0.775V. Then, set the Monitor
switch to SOURCE and adjust
RT2(L, R) so that output voltage
at TP3L, R is 0.775V.
Abgleich: Ein 400...

Page 12

Ir
4. Playback output and VU meters
adjustment
Setting: Playback mode
Connection:
4. Wiedergabepegel und Pegelmesser
Einstellung: Wiedergabe
Anschlússe:
4. Réglage de niveau de sortie de
lecture et dindicateurs de niveau
Réglage: Mode de lecture
Branchement:
Abgleich:
1) Monitorschalter auf Position
SOURCE stellen. Ein 400 Hz
Signal an den LINE lN Buchsen
einspeisen und den Signalge-
nerator einstellen, bis an den
Stiften TP3 L, R eine Ausgang-
sspannung von 0,775V anliegt.
2) Danach RT103(L,R)...

Page 13

English
5. Bias current, record level adjust-
ment
Setting: Record ing/Playback mode
Gonnection:
5. Vormagnetisierungsstrom, Aufnah-
mepegel
Einstellung: Aufnahme/Wiedergabe
Anschlússe:
LINE lN jacks
Abgleich:
1) HITACHI UD-ER C-90 Cassette
verwenden.
2) Den Monitor-Schalter auf Posi-
tion SOURCE stellen und ein
4OO Hz Signal an den LINE lN
Buchsen einspeisen.
Danach das Dàmpfungsglied des
Signalgenerators so abgleichen,
daB die VU-Meter des Geràtes
einen Pegel von O VU anzeigen.
AnschlieBend den...

Page 14

English
5) Set the monitor switch to
SOURCE position.
Reduce the output of the signal
generator (Adjust the attenuator
of the signal generator ) so that
the VTVM indicates -20 dB
from the standard recording
level A.
Then, set the monitor switch
to TAPE position and observe
the VTVM (This indication is
B dB).
6) Set the monitor switch to
SOURCE position.
Feed 12kHz signal into LINE lN
and adjust the attenuator of the
signal generator so that the
VTVM indicates -20 dB from
the standard recording level A....

Page 15

D-980
Adjustment: Feed a 5kHz signal
into LINE lN, so rhat the voltage at
TP2L, R becomes -30.4dBm.Then, set the DOLBY NR Switch
to oN. Adjust RT1(L,R) so that
the voltage at TP2L, R becomes
-22.4d8m.
6.-2 Playback
Setting; Playback mode
Connection:
English
6. Dolby NR adjustment
6.-1 Record
Setting: Playback Mode
Connection:
6. Dolby-NR-Abgleich
6.-1 Aufnahme
Einstellung: Wiedergabe
Anschlússe:
LINE lN jacks
Abgleich: Ein 5 kHz Signal an den
LINE lN Buchsen einspeisen, so
daB der Pegel an TP2L, R...

Page 16

CIRCUIT BOARD DIAGRAM
: Ground
: Signal, +B
LEDI02 LEDIOI
PEAK
LEDIOO
INDICATOR
3-HEAD INDICATOR
-16- 

Page 17

CIRCUIT BOARD DIAGRAM
I
fl
È.l
MAIN
-17 - 

Page 18

: Component side patternI : Ground: Signal, +B
1
t?
a
tsè
a
!-l
1r
RECORO LINE
RECORO MICIDIN
I
I
I
I
I
CONTROL
-18- 

Page 19

SCHEMATIC DIAGRAM (AMP./CONTROLSECTION) - For U, C
-À.
Dr3 0r5
06 o2L2SC|74O 2SC\74ODCCS 4OOHZ OSCDls Dl4 Oll4L Dl24 lClL tC3L QILHprl6 1s2473 2SK68Aì FE-g HAt406 HAr406 2SC458LG1s2473 ?SC!74oBACK CURRENT S\fuNCHII\IGCHECK l- -
HEADAMP VOL]: I\1ICIDIN HEAD AMP N4C/DIN AMP-STAB -SWITCHING SWITCHING LINE AI\1PSWITCHING PLAYDOLBY-NR
,r3l$rn P)3orcLINE AMP
lrHIREC DOI
Qil225Ct2rBIAS COÀ
QtooL orolL Qro2L25Dil67 250467 2SCt740oro3L rc42SD467 H4il226SWITCHING HEADAMP
fErNl
t--- 
- -6li|lrqî
L-c--
PLAYBACKHEAD...

Page 20

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--1
05 F* Drr
(Rch RSR 2-7K )
*rtlt rr?,|,f;o oi{13}u D2l4D2l5 e2o6 ozos o2ro e2t? LEor LED2 LED3 LED4 LEDo .Q?Qg- D?oQ Dr...
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