Tascam Portastudio 424mkIII Owners Manual

46
45 49. CLEAR key: Turns off the REHEARSAL and
AUTO PUNCH IN/OUT functions (pp.30-31).
50. COUNTER RESET switch: This resets the
COUNTER to 0000 so you can assign any
point on the tape as a starting location.
Pressing RTZ (#44) gets you back to that
location.
51. REHEARSAL switch: Helps you rehearse a
punch-in without erasing anything until you
are ready to actually record (p.29).
52. AUTO PUNCH switch: Automates the punch-
in/out sequence (Preroll, Punch-in, Punch-out
and Postroll) you programmed in...

47Optional AccessoriesTZ-261 Cleaning Kit (Except U.S.)HC-1 Head Cleaner & RC-1 Rubber Cleaner
(U.S.only)  Head Demagnetizer RC-30P Remote Footswitch MIDI-Tape Synchronizer
Cleaning the Heads and Tape Guides
All heads and metal parts in the tape path must
be cleaned after every 6 hours of operation, or
before starting and after ending a recording
session.
1. Open the cassette compartment door. Tape
should not be loaded.
2. Hold STOP and REHEARSAL and press POWER
to activate a Cleaning mode. Cleaning...

49 The dbx is a wide-band compression-expansion
system which provides a net noise reduction
(broadband, not just hiss) of a little more than 
30 dB. In addition, the compression during
recording permits a net gain in tape headroom of
about 10 dB.
A compression factor of 2:1 is used before
recording; then, 1:2 expansion on reproduce.
These compression and expansion factors are
linear in decibels and allow the system to
produce tape recordings with over a 90 dB
dynamic range – an important feature,...

50
Specifications
Mechanical Characteristics
Tape: Compact Cassette (C-30 to 90), High-Bias (CrO2)
Track Format:4-track/4-channel
Head Configuration:4-channel record/play (permalloy) x 1
4-channel erase (ferrite) x 1
Motor:DC servo motor x 1
Tape Speed:Switchable two speeds: 9.5 cm/sec. (3-3/4 ips) and
4.8 cm/sec. (1-7/8 ips), ± 1%
Pitch Control:± 12 % (approx.)
Wow and Flutter:0.06% WRMS at 4.8 cm/sec.,
0.05% WRMS at 9.5 cm/sec.
Fast Winding Time:120 sec. (approx.) with C-60
Dimensions (W ´H ´D)419 x...

EFFECT 2 SEND/TAPE CUE OUT 
(1/4 phone jack)
Output Impedance:100 ohms
Nominal Output Level:–10 dBV (0.3 V)
Minimum Load Impedance:2k ohms
TAPE OUTPUT (RCA jack x 4)
Output Impedance:100 ohms
Nominal Output Level:–10 dBV (0.3 V)
Minimum Load Impedance:2k ohms
MONITOR OUTPUT (RCA jack x 2)
Output Impedance:690 ohms
Nominal Output Level:–10 dBV (0.3 V)
PHONES (1/4 stereo phone jack x 1)
Nominal Load Impedance:30 ohms
Maximum Output Level:60 mW (approx.)
Equalizer
HIGH (Shelving):10 kHz, ±10 dB
MID...

52
419mm115mm
51mm4mm
357mm
351mm
Others
Power Requirements
USA/CANADA:120 V AC, 60 Hz
U.K./EUROPE:230 V AC, 50 Hz
AUSTRALIA:240 V AC, 50 Hz
Power Consumption:22 W
In these specifications, 0 dBV is referenced to 1 Volt. Actual voltage levels are also given in parentheses
(0.316 V for -10 dBV rounded off to 0.3 V).
* dbx is a registered trademark of dbx Incorporated.
n
Changes in specifications and features may be made without notice or obligation. 

54 53
Block Diagram 

55Level Diagram
424@$
TEAC CORPORATION
3-7-3, Nakacho, Musashino-shi, Tokyo 180-8550, Japan   Phone: (0422) 52-5082
TEAC AMERICA, INC. 7733 Telegraph Road, Montebello, California 90640   Phone: (323) 726-0303TEAC CANADA LTD.5939 Wallace Street, Mississauga, Ontario L4Z 1Z8, Canada   Phone: 905-890-8008  Facsimile: 905-890-9888TEAC MEXICO, S.A. De C.V Privada De Corina, No.18, Colonia Del Carmen Coyoacon, Mexico DF 04100 Phone: 5-658-1943TEAC UK LIMITED 5 Marlin House, Marlins Meadow, The Croxley Centre,...