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TROUBLESHOOTING 

Check the following before you draw the conclusion that your Stereo Cassette Deck 

is malfunctioning. 1. Are all the connections correct? 2. Are all system components being operated 

correctly in accordance with the operating instructions? 3. Are the speakers and amplifier/ receiver functioning correctly? If the tape deck still does not function properly, check the symptom 
against the list below. If the symptom does not correspond to the check list, please contact your DENON dealer. 

Problem  

Cause 

 

Remedy 

Tape does not run 

• 

Power cord is disconnected. 

• 

Check power cord. 

 

• 

Tape is loose. 

• 

Tighten tape with a pencil, etc. 

 

• 

Cassette is not loaded properly. 

• 

Load cassette properly. 

 

• 

Defective cassette. 

• 

Replace cassette. 

Tape is not recorded when REC/REC MUTE ( • ) 

• 

No cassette is loaded. 

• 

Load cassette. 

button is pressed. 

• 

Erase prevention tabs are broken off. 

• 

Cover holes with adhesive tape. 

Sound is warbled and distorted. 

• 

Heads, capstan or pinch roller are dirty. 

• 

Clean them. 

 

• 

Tape is wound too tight. 

• 

Fast forward or rewind to loosen tape 

  

 

 

winding. 

 

• 

Recording input level is too high. 

• 

Adjust recording input level. 

 

• 

Tape is worn out and has "drop-outs". 

• 

Replace tape. 

Excessive noise 

• 

Tape is worn. 

• 

Replace them. 

 

• 

Heads, capstan or pinch roller are dirty. 

• 

Clean them. 

 

• 

Heads are magnetized. 

• 

Demagnetize heads. 

 

• 

Recording input level is too low. 

• 

Adjust recording input level. 

High frequency range (treble) is emphasized. 

• 

Dolby NR switch is set improperly. 

• 

Set Dolby NR Switch properly. 

High frequency range (treble) is lost. 

• 

Heads are dirty. 

• 

Clean them. 

 

• 

Tape is worn. 

• 

Replace tape. 

The cassette tape cannot be removed. 

• 

If the POWER switch is turned off either 

• 

Turn the POWER switch ON again, and 

 

 

during recording or playback and the unit is 

 

then press the STOP button. 

 

 

stopped, there may be cases when the 

• 

Now, press the EJECT button to 

 

 

cassette cannot be removed, even if the 

 

remove the cassette tape. 

 

 

EJECT button is pressed. 

 

 

 

SPECIFICATIONS

* Above specifications and design are subject to change without prior notice. 

Dolby noise reduction and HX Pro headroom extension manufactured under license from Dolby Laboratories Licensing Corporation. HX Pro originated by 
Bang & Olufsen. . 
"DOLBY", the double-D symbol and "HX PRO" are trademarks of Dolby Laboratories Licensing Corporation. 

15

Type

 

Vertical tape loading; 4-track 2-channel 

  

stereo double cassette deck 

Heads

 

Recording/ playback head (Amorphous) x 2 

  

Erase head (Double-gap ferrite) x 2 

Motors

 

Capstan (DC servo motor) x 2 

  

Real (DC motor) x 2 

Tape Speed

 

4.8 cm/ sec. 

Variable (PLAY) 

Approx. ±12% 

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/ARM) 

Overall Frequency 
 Response

 

20 --- 18,000 Hz ±3 dB (at-20 dB, Metal tape) 

Channel Separation

  More than 40 dB (at 1 kHz) 

Wow & Flutter

 

0.06% WRMS, ±0.14% w. peak 

Input 

 

LINE

 

80 mV (-20 dBm) input level at maximum 

  

Input impedance: 50 kohm unbalanced 

Output 

 

LINE

 

775 mV (0 dB) output level at maximum 

   

(with 47 kohm load, recorded level of 

   

200 pwb/mm) 

 PHONES

 

1.2 mW output level at maximum 
(optimum load impedance 8 ohm ~ 1.2 
kohm) 

Power Supply

 

Voltage is shown on rating label 

Power Consumption

 

Show on rating label 

Dimensions

 

4831W1 x 134 (H) x 2751D) mm 

   

(17-3/32" x 4-57/64" x 10-53/64") 

Weight

 

5.4 kg (9 Ibs 11 oz) 

Summary of Contents for DN-770R

Page 1: ...STEREO CASSETTE TAPE DECK DN 770R OPERATING INSTRUCTIONS...

Page 2: ...serial number of your set shown on the rating label Model No DN 770R Serial No CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICIN...

Page 3: ...ot likely to be walked on or pinched by items placed upon or against them paying particular attention to cords at plugs convenience receptacles and the point where they exit from the appliance 14 Clea...

Page 4: ...g the cord Keep the set free from moisture water and dust Unplug the power cord when not using the set for long periods of time For sets with ventilation holes Do not obstruct the ventilation holes Do...

Page 5: ...X Pro Headroom Extension System deck B only Dolby B C Noise Reduction Systems A B Independent Computing Tape Counter with 4 Digit Readout and Memory Stop Music Search System FL Peak Level Meters Auto...

Page 6: ...deck A only regardless of the position of the deck A B selector Reverse Mode Switch REV MODE Select the type of tape transport The reverse mode can be set to one side continuous playback RELAY relay...

Page 7: ...nding button is pressed CASSETTE TAPES Handling Precautions C 120 Cassettes C 120 cassette tapes are not recommended as they use a very thin tape base which may become tangled around the capstan or pi...

Page 8: ...r When listening to a tape that has been recorded with Dolby noise reduction set the DOLBY NR button to match the system used at the time of recording Pressing the DOLBY NR button selects Dolby noise...

Page 9: ...rdings with discontinuous speech or conversation Recordings with long periods of pianissimo softly played music Recordings with long silences Blank sections with a high level of noise Blank sections s...

Page 10: ...er Press the PLAY button to start the recording The PLAY or and the indicator will light during recording To stop recording press the stop button To pause the recording press the REC PAUSE II button P...

Page 11: ...B and the REVERSE MODE switch Press the TWIN REC button The A B indicator will light up and both decks will enter the recording pause mode Adjust the INPUT LEVEL control for the best recording input...

Page 12: ...ortion of the opposite side of the tape To begin normal speed dubbing press the DUBBING SPEED NORMAL button The DUB indicator will light at this time To high speed dubbing press the DUBBING SPEED HIGH...

Page 13: ...g forward tape travel or the Fast Forward button is pressed during reverse tape travel the tape is rapidly rewound or advanced until the counter indication of 0000 is reached The Memory Stop feature w...

Page 14: ...ned more often to enjoy the best possible sound 14 The operating principle of Dolby C NR is similar to that of Dolby B NR except for the encoding decoding response curves The noise reduction effect ob...

Page 15: ...ape is worn Replace tape The cassette tape cannot be removed If the POWER switch is turned off either Turn the POWER switch ON again and during recording or playback and the unit is then press the STO...

Page 16: ...ptible the system will be to the effects of external noise Keep cable lengths to 2 m or less Do not locate equipment that produces electrical noise in the vicinity of the cable Doing so might lead to...

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