Hitachi D-980 Service Manual

SERVICE MANUAL
English
Deutsch
FrongoisNo. I l5ó
English
This unit employs the UD-1 standard
mèchanism. When inspecting and re-
pairing this unit, read this together
with the service manual (No. 1 155)
of the UD mechanism (UD-1).
USA
Canada
General Area
Switzerland
and Scandinavia
Great Britain
Australia
D ieses Geràt ist mit der Standard-
Mechanik UD-1 ausgerústet. Fùr
Prúfung und Eeparatur dieses Geràtes
ist daher die vorliegende Anleitung
gemeinsam mit der Wartungsanleitung
(Nr. 1155) fúr die...

II1
iI!
KEY TO ILLUSTRATIONS
1 RECORD INDICATOR
2 PLAYBACK INDICATOR
3 PAUSE INDICATOR
4 3.HEAD INDICATOR
5 TAPE COUNTER
6 COUNTER RESET BUTTON
7 AUTO.REWIND SWITCH
8 BIAS FINE ADJUSTMENT KNOB
9 MEMORY SWITCH
1O VU METER (LEFT)
11 PEAK INDICATORS
12 VU METER (RIGHT)
13 DCCS CONTROLS
14 OUTPUT LEVEL CONTROL
15 RECORDING LEVEL CONTROLS
16 RECORDING LEVEL CONTROLS
17 MONITOR S1/VITCH
18 DOLBY NR SWITCH
19 TAPE SELECT SWITCH
(EOUALIZER)
20 TAPE SELECT SWITCH {BIAS)
21 EJECT BUTTON
22 REC MUTE BUTTON
23 PAUSE...

English
SPECIFICATIONS
SemÈcondustors:tc,s
Transisto rs
FETS
Diodes
LEDSTrack System:Tape:
Tape Speed:
Recording SYstem andBias Frequency:
Erasing Sytem:
Erase Ratio:
Frequency Response:
UD-ER (NOR)
UD-EX (CrO, )
FeCr
S/N (Signal to Noise Ratiol:Dolby NR OFF:
Dolby NR ON:
Wow and Flutter:
lnput Sensitivity and lmpedance:
Microphone:
Line in:
Power Consumption:
Dimensions:Weight:
Motor:
Heads:
* According to DIN 45 500
8s6 (u, c)
54 (W, FS, BS, AU)
24s (u, c)
44 (W, FS, BS, AiJ}11
4 track 2 channel...

8s6 (u, c)
54 W, FS, BS, AUI
2
4s (u, c)
44 O, FS, BS, AU)
1.|Viertelspurgeràt, Stereo
Casetten-Tonband (C-30, 60, 901
4,75 cm/sek
Wechselstrom-Vormagnetisierung, 1 05 kHz
Wechselstrom -Lóschung
>65 dB (bei 1 kHz)
20-18.0O0 Hz
30-17.000 Hz (r3 dBl
30-17.0O0 Hz +
20-2O.000 Hz
30-18.000 Hz (t3 dB)
30-18.000 Hz *
20-18.000 Hz
30-17.0OO Hz (t3 dB)
30-17.000 Hz +
59 dB (Bewertungs-f ilter A,37o Klirr)
59 dB*
67 dB (Bewertungs-filter A,3% Klirr)
67 dB*0.03% (wRMS)
O,1Y *
0,35 mV, 3O0 Ohm bis 5 kOhm
50 mV, 100...

English
DISASSEMBLY
1. Cassette lid (Fig. 1)
2. Knobs* The lever switch knobs (POWER, MONITOR, BIAS, EOUALIZER,
DOLBY-NR) and the level adjustments knobs (OUTPUT, RECORD
LEVEL) are pulled off from the f ront of the front panel.* Operating buttons, BIAS FINE adjustment knob, MEMORY button,
AUTO-REWIND knob, DCCS button and DCCS adjustment knobs are
removed after taking off the front panel.
3. Top cover (Fig. 2)
4. Bottom cover (Fig. 3)
5. Front panel (Fig.4, 5)
Remove the front panel after removing the...

rer (Netzschalter, Monitor, Vormagne-
NR) und die Pegeleinstellknòpfe (Aus-
kónnen von der Frontplatte einfach
)rmagnetisierungs-Feineinstellknopf, dieìúcklaufautomatik, die Dolby-Kalibrier-gler sind von der Rùckseite abzunehmen,nt wufde.
ldem die Knòpfe der Hebelschalter, die
ft enfachdeckel entfernt wurden.
-Platine (Abb. 7)
es Cassetten-Chassis entfernen, die in den
DEMONTAGE
1. Volet de cassette (Fig. 1l
2. Boutons de réglage* Les clefs de commutation (POWER, MONITOR, BIAS, EOUALIZER,DOLBY-NR) et les...

FEoIJÈ.
oolro
o-oo
BLOCK DIAGRAM
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É-Jo9ct
EUBJ){oOE
__l-ao>
roPÀÀ;
3:OU
.lulFouE;

à9pq
È.P9ozYIJo-
Level values shown in th€ diagram are
the playback output levels obtained byplay ing back a tost tapo MTT-I50.
Recording input levels are sot at eacl
input terminal so that playbsck output
levels using the t€3t tape MTT-150 can
be obtained.
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fieEE
oozUJoaulYÈ@
9E:9
Eb5
638Q -()o9FF
r 9È.,8
R$HaiÉ
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---+
ozìUIoFf
3g
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FfoeEo(Jiro-z
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sÈ
zoFour flFOr!Fo()o- ui
9úE;A
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a
English
ADJUSTMENTS
Perform the following adjustments in
the sequence stated after cleaning the
head, pressure roller, and capstan
with a head cleaning stick moisted in
alcohol. Also, unless sPeciallY
indicated otherwise, set the switches
and controls to the positions indicated
in the table.
Adjustment and semi-conductor paÉs
location diagram
Abgleiche
Die folgenden Abgleiche in der auf-
gefùhrten Reinhenfolge durchfÚhren,
nachdem die Tonkópfe, die Andruck-
rolle und die Tonwelle mit einem in
Alkohol...

I Engtish I
Next, connect the indicated signal
source and measuring instruments as
shown in the connection diagram for
each adjustment; then perform the
adjustment as described.
The adjustment parts are shown in the
diagram on the previous page.
1. Tape speed (motor speed) adjust-
ment
Setting: Playback mode
Connection:
MTT-111
3000H2(31 50Hz*
Adjustment: Warm up the unit for
approxiryately 20 minutes; then
playback test tape MTT-l 1 1,
3000H2(3150H2*), and measure
the speed deviation with a frequen-
cy...