Head Demagnetization; Maintenance Of External Surfaces - Technics RS-TR474 Operating Instructions Manual

Head care
To assure sound quality for recording and playback, be sure to
clean the heads after approximately every 10 hours of use.
1) Press the open/close button to open the cassette holder.
2) Disconnect the AC power supply cord from the AC outlet.
3) Clean the heads, pinch roller and the capstan shaft with a cot-
ton swab (or with a soft, lint-free cloth) slightly moistened with
isopropyl alcohol.
Do not use any sofution other than alcohol for head cleaning.
Capstan
Pinch roller _*,
Cotton swab
», Pinch roller
Capstan
Head demagnetization
In order ta malntatn good sound quality during recording and
playback, it Is recommended that the head assembly be
demagnetized if distortion or poor sound quality persists after
cleaning the heads.
If the head assembly becomes magnetized, it could create noise
in the recordings, loss of high-frequency response or erasure of
valuable recordings.
Several types of head demagnetizers are available and may be
purchased separately at local electronics supply stores.
Follow the instructions that are supplied with the device.
Do not bring any type of metal objects or tools such as magnetic
screwdrivers In contact with the head assembly.
Maintenance of external surfaces
To clean this unit, use a soft, dry cloth.
If the surfaces are extremely dirty, use a soft cloth, dipped into a
soap-and-water solution or a weak detergent solution.
Wring the cloth well before wiping the unit.
Wipe once again with a soft, dry cloth.
Never use alcohol, paint thinner, benzine, nor a chemically
treated cloth to clean this unit.
Such chemicals may damage the finish of your unit.
WICASSETTE DECK SECTION
Deck system
Track system
Stereo cassette deck
4-track, 2-channel
Recording system AC bias
Bias frequency 80 kHz
Erasing system AC erase
Heads
DECK 1 Piayback head (Permalloy) x 1
DECK 2 Recording/Playback head (Permalloy) x 1
Erasing head (Double-gap ferrite) x 1
Motors
DECK 1 Capstan drive (DC servo motor) * T
Reel table drive (DC motor) x +
DECK 2 Capstan drive {DC servo motor) x 1
Reel tabe! drive (DG motor) x 1
Tape speed 4.8 cmisec. (1-7/8 ips)
Wow and flutter 0.1% (WRMS)
+0.2% (DIN)
Fast forward and rewind times
[RS-TR474] Approx. 50 seconds with C-60 cassette tape
[RS-TR373] Approx. 95 seconds with C-60 cassette tape
Frequency response (Dolby NR off)
NORMAL 40 Hz—15 kHz, +3 dB
20 Hz— 16 kHz (DIN)
cro, 40 Hz—15 kHz, +3 dB
20 Hz—16 kHz (DIN)
40 Hz-16 kHz, +3 dB
20 Hz—17 kHz (DIN)
SIN (Signal level = max recording level, CrO, type tape)
NR off 56 dB (A weighted)
Dolby B NR on 66 dB (A weighted)
Dolby C NR on 74 dB (A weighted)
Input sensitivity and impedance
METAL
REC (IN) 100 mVI47 kQ
Output voltage and impedane
PLAY (OUT) 500 mv/500 Q
HEADPHONES [RS-TR474j 30 mV (8 Q)
(Load impedance 8-600 9)
Wi GENERAL
Power consumption 24W
Power supply
For United Kingdom, Europe, Australia and N.Z.
AC 50 Hz/60 Hz. 230 V—240 V
For others AC 50 H2/60 Hz, 110 V/127 V/220 V7240 V
Dimensions (W x H x D) 430 x 136 x 285 mm
Weight 4.4kg
~ Note: a an
Specifications are subject to charge without notice.
Weight and dimensions are approximate.
For United Kingdom
This apparatus was produced te BS 800.
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