Teac R-999X Bedienungsanleitung Seite 13

Dolby B, C and dbx Noise Reduction
Systems
To meet various source recording require-
ments, the cassette deck is equipped with
three noise reduction systems: Dolby B and
C and dbx. The Dolby B system provides a
maximum noise reduction of 10 dB in the
middle and high-frequency ranges, while
Dolby C provides a maximum noise reduc-
tion of 20 dB to the middle and high
frequency ranges, with its effects beginning
to appear in the low frequency range. The
dbx noise reduction system works on a
basically different concept than the Dolby
NR systems, and provides 30 — 40 dB of
noise reduction throughout the complete
audio spectrum.
Maintenance (Refer to Fig. 4)
The cover of the cassette holder door has
been designed for easy removal to facilitate
cleaning and demagnetization of the heads
and tape path. This isan important mainten-
ance requirement and should be done
regularly. The cover is removed by first
opening the cassette holder by pressing the
EJECT button, then grasping the two sides
and pulling gently upwards.
The heads should be demagnetized with a
TEAC E-3 or similar demagnetizer. Be sure
the power is off during demagnetization.
For head cleaning, the power should be
turned on and the cassette holder door
frame closed. Press the play ( < or > )
button to bring the heads up into a more
accessible position.
To replace the cover, release the door by
pressing the EJECT button and replace by
locating the retaining lugs. Push gently into
place.
Troubleshooting
1k
NR System Noise Analyses (Overall)
Basic troubleshooting of a cassette tape
deck is similar to troubleshooting any other
electrical or electronic equipment. Always
check the most obvious possible causes first.
To give you a few ideas of what to look for,
check the following:
@ No power. Is the power cord connected?
@ Tape begins running when power is
turned on. Is the TIMER function
on?
@ No audio output. Are all connections
Properly made? Is the output level set
high enough?
© Degraded sound quality. Are the heads
dirty or magnetized? Are you using
good quality tape? Is the proper NR
System select switch on?
@ Unable to select record mode: Are the
record protection tabs on the tape in
place?
Caution:
If the surface of the unit gets dirty, wipe
with a soft cloth or use a diluted neutral
cleaning liquid. Clean off thoroughly.
Do not use thinner, benzine or alcohol as
they may damage the surface of the unit.
a
Specifications
—————Eee
Track System 4-Track, 2-Channel Stereo
Heads 4: 2 Erase, 1 Record and
1 Playback (Rotary)
Type of Tape Cassette tape C-60 and C-90
(Philips type)
Tape Speed 4.76 cm/sec. (1-7/8 ips)
Motors 6: 2 DD FG Servo DC motors
(for capstan drive)
2 DD coreless DC motors
(for reel drive)
2 DC motors (for ancillary and glide
control)
Wow and Flutter (WRMS) 0.025%
Frequency Response (Overall) —20 dB
20 — 22,000 Hz Metal Tape
(25 — 21,000 Hz +3 dB)
20 — 21,000 Hz Co (Cr0,) Tape*
(25 — 20,000 Hz +3 dB)
20 — 20,000 Hz Normal Tape*
(25 — 19,000 Hz +3 dB)
Signal-to-Noise Ratio (Overall)
61 dB (3% THD Level, Weighted)
70 dB (Dolby B In, over 5 kHz),
80 dB (Dolby C In, over 1 kHz),
92 dB (dbx In, at 1 kHz)
Dynamic Range 110 dB (dbx in, 1 kHz
Peak Level)
Fast Winding Time Approximately 70
seconds for C-60
Inputs Line: 60 mV, 50k ohms
Outputs Line: 0.5 V for load impedance of
50k ohms or more
Headphone: 8 ohms
Power Requirements 100/120/220/240 V
AC, 50/60 Hz (General export
models)
120 V AC, 60 Hz (U.S.A./Canada)
220 V AC, 50 Hz (Europe)
240 V AC, 50 Hz (U.K./Australia)
Power Consumption 38W
Dimensions (W x H x D)
436 x 119 x 350 mm
(17 x 7-9/16" x 13-3/4")
Weight 8.5 kg (18-12/16 Ibs) net
Standard Accessories
Input-output connection cords
Specifications were determined using
metal tape except as note.
@ Improvements may result in specifica-
tions or features changing without
Notice. 7
@ Photos and illustrations may differ
slightly from production models.