Table Of Contents; Features; Specifications - Denon DR-M3QHX Service Manual

TABLE OF CONTENTS
FEATURES . 2
SPECIFICATIONS. 3
BLOCK DIAGRAM. 4
LEVEL DIAGRAM . 5
PART NAMES AND FUNCTIONS . 6-7
OUTLINE OF THE MECHANISM CONTROL MICROCOMPUTER. 8
DISASSEMBLY INSTRUCTIONS. 9-11
ADJUSTING AND CHECKING THE MECHANISM SECTION .12-14
ADJUSTING THE ELECTRICAL SECTION.14-17
PARTS LIST OF P.W. BOARD .18-19
PARTS LIST OF EXPLODED VIEW. 20
EXPLODED VIEW OF CABINET AND CHASSIS GROUP. 21
EXPLODED VIEW OF MECHANISM VM861 UNIT. 22
PARTS LIST OF MECHANISM VM861 UNIT AND OTHER PARTS . 23
FUNCTION OF REMOTE CONTROL 1C . 23
SCHEMATIC DIAGRAM OF AUDIO AMP UNIT... 24
P.W. BOARD OF KU-5881 AUDIO AMP UNIT. 25
SCHEMATIC DIAGRAM OF POWER/LOGIC UNIT. 26
P.W. BOARD OF KU-5871 POWER/LOGIC UNIT
AND KU-5890 MECHANISM UNIT . 27
SCHEMATIC DIAGRAM OF COUNTER METER UNIT ... 28
SEMICONDUCTORS. 29
WIRING DIAGRAM .. 30
FEATURES
■ Computer-controlled servo technology
* Closed-loop dual-capstan tape transport.
* Silent, soft-touch controls provide maximum ea$e-of*use.
* Computer-controlled, full-logic tape controls enable fool-proof operation.
■ Three-head design utilizes DENON's new SF record/playback combination head assembly.
■ Computing tape counter with 4-digit readout and memory stop.
■ Dolby-C noise reduction systems (Double Dolby System).
■ Dolby HX PRO head room extension system.
■ Wireless remote control.
■ Extended range, dual-color fluorescent peak meters.
■ Auto tape selector.
■ Recording Bias adjustment.
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SPECIFICATIONS
• Type .
• Heads.
• Motors.
• Tape Speed.
• Fast forward, rewind time . . .
• Recording bias.
• Overall S/N ratio .
(at 3% THD level)
• Overall fequency response. . . .
• Channel separation.
• Crosstalk.
• Wow Aflutter.
• Inputs
line .
• Outputs
line .
Headphone .
• Accessories.
• Power supply.
• Power consumption .
• Dimensions.
• Weight.
Vertical tape loading 4-track 2-channel stereo cassette tape deck
SF Record/Playback combination head x 1
Erase head (Ferrite) x 1
Electronic servo DC motor (for capstan) x 1
DC motor (for reel winding) x 1
4.8 cm/sec.
Approx. 90 sec. with a C-60 cassette
105 kHz
Dolby C NR on ... more than 75 dB (CCIR/ARM)
25 - 19,000 Hz ±3dB (at -20 dB METAL tape)
More than 40 dB (at 1 kHz)
More than 65 dB (at 1 kHz)
0.045% wrms (JIS method)
lOOmV (-18 dB) input level at maximum
Input impedance: 50 kohm unbalanced
775mV (0 dB) output level at maximum (with 47 kohm load,
recorded level of 200 pwb/mm)
1.2mW output level at maximum (optimum load impedance 8 ohm
- 1.2 kohm)
Parallel pin cord x 2
50 Hz/60 Hz compatible, voltage is shown on rating label
18W
434 (W) x 115 (H) x 286 (D) mm
5.6 kg
■ 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 riginated by Bang and Olufsen. "Dolby", the double-D
symbol and "HX PRO" are trademarks of Dolby Laboratories Licensing Corporation.
WARNING:
1. Component parts
Parts marked with ^ and/or shading in this service manual have special characteristics important to
safety. Besure to use the specified parts for replacement.
2. Leakage current
Before returning the appliance to customer, test the leakage current when the power plug is connected.
Use a calibrated (with an error of not more than 5%) leakage current tester and measure the leakage
current from any exposed metal to the earth ground. Reverse the power plug polarity and test the
above again.
Any current measured MUST NOT EXCEED 0.5 mitliamps. Corrective measure must be taken if it
exceeds the limit.
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