Troubleshooting; Specifications - Denon DN-720R Operating Instructions Manual

TROUBLESHOOTING

Make sure of the followings before you consider as any malfunctions:
1. Are all the connections correct?
2. Is the set being operated correctly in accordance with the operating instructions?
3. Are the speakers and amplifiers functioning correctly? If the tape deck still does not function properly, check it again, using the check list below.
If the symptom does not correspond to the check list, please contact your DENON dealer.
Problem
Tape does not run.
Tape is not recorded when recording button is
pressed.
Sound is warbled or distorted.
Excessive noise.
High frequency (treble) is emphasized.
High frequency (treble) is lost.
When a Cr02 or metal tape is placed in the deck,
a different tape indicator comes on.
The cassette tape cannot be removed.

SPECIFICATIONS

Type Vertical tape loading; 4-track 2-channel
stereo cassette deck
Heads Recording/ playback head (Amorphous) x 1
Erase head (Double-gap ferrite) x 1
Motors Capstan (DC servo motor) x 1
Reel (DC motor) x 1
Tape Speed 4.8 cm/sec. (FIX)
Variable (PLAY) Approx. ±72%
Fast Forward,
Rewind Time Approx. 110 sec. with a C-60 cassette
Recording Bias Approx 105 kHz
Overall S/N Ratio
(at 3% THD level) Dolby C NR on: more than 74 dB (CCIR/ARM1
Overall Frequency
Response 25 - 19,000 Hz ±3 dB (at-20 dB, Metal tape)
Channel Separation More than 40 d8 (at 1 kHz)
Crosstalk More than 65 dB (at 1 kHz)
Wow & Flutter 0.055% WRMS (JIS method), ±0.14°/ w. peak
Inputs
Line 80 mV (-20 dBm) input level at maximum
Input impedance: 50 kohm unbalanced
Cause
• Power cord is off.
• Tape is completely wound up.
• Tape is loose.
• Cassette is not loaded properly.
• Defective cassette.
• No cassette is loaded.
• Erase prevention tab is broken off.
• Heads, capstan or pinchroller are contaminated
• Tape is wound too tight.
• Recording input level is too high.
• Tape is worn out and has "drop-outs".
• Tape is worn.
• Heads, capstan or pinchroller are contaminated
• Heads are magnetized.
• Recording input level is too low.
• Dolby NR button is set improperly.
• Heads are contaminated.
• Tape is worn.
• The cassette housing is of an older design
without tape type detection holes.
• If the power switch is turned off in either the
recording or playback mode, and the unit is
stopped, there may be case when the
cassette cannot be removed, even if the
EJECT button is pressed.
Outputs
Line
(with 47 kohm load, recorded level of
200 pwb/mm)
Headphone
(optimum load impedance
8 ohm
Power supply
Power Consumption
Dimensions
Weight
Installation
• Above specifications and design styling are subject to change for
improvement.
Dolby noise reduction and HX Pro headroom extension manufactured
•
under license from Dolby Laboratories Licensing Corporation. HX Pro
originated by Bang & Aloofness.
"DOLBY", the double-D symbol mand "HX PRO" are trademarks of
Dolby Laboratories Licensing Corporation.
Remedy
• Check power cord.
• Rewind tape.
• Tighten tape with a pencil, etc.
• Load cassette properly.
• Replace cassette.
• Load cassette.
• Cover hole with plastic tape.
• Clean them.
• Fast forward or rewind to loosen tape
winding.
• Adjust recording input level.
• Replace tape.
• Replace tape.
• Clean them.
• Demagnetize heads.
• Adjust recording input level.
• Set Dolby NR button properly.
• Clean them.
• Replace tape.
• Use the latest cassette with tape type detection
holes.
• Turn the power switch ON again, and then
press the stop button.
• Then, in the stop mode, press the EJECT
button to remove the cassette tape.
1.2 kohm)
-V
775 mV (0 dB) output level at maximum
1.2 mW output level at maximum
Voltage is shown on rating label
16 W
(4831W) x 1341H) x 2751D) mm
4.7 kg
19-inch rack mountable (3U)
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