Denon UD M50 Service Manual

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For U.S.A., Canada, U.K.,
Europe & Asia models
Hi-Fi Personal Component System

SERVICE MANUAL
MODEL UD-MED

STEREO CD RECEIVER
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- TABLE OF CONTENTS -
SPECIFICATIONS
DISASSEMBLY

DISASSEMBLING CD MECHA,
ASSEMBLING CD MECHA
BLOCK DIAGRAM
ADJUSTMENT .....
SEMICONDUCTORS
PRINTED WIRING BOARD ..
NOTE FOR PARTS LIST ..................
PARTS LIST OF P.W.B. UNIT ASS'Y l.
PARTS LIST OF EXPLODED VIEWI
EXPLODED VIEW .............................
EXPLODED VIEW OF CD MECHANISM UNIT
PARTS LIST OF CD MECHANISM UNIT
WIRING DIAGRAM .......
SCHEMATIC DIAGRAMS.
PACKING VIEW ............
PARTS LIST OF PACKING 8. ACCESSORIES

L0 Some illustrations using in this service manual are slightly dlflerent from the actual set. ]

NIPPON COLUMBIA 00.. LTD.

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SAFETY PRECAUTIONS

The following check should be performed for the continued protection of the customer and sen/ice technician.

LEAKAGE CURRENT CHECK

Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.

SPECIFICATIONS
l RECEIVER SECTION

Reception frequency band: FM: 87.5 MHz - 108.0 MHz

' AM: 520 kHz - 1710 kHz (U.S.A. & Canada model)
522 kHz - 1611 kHz (Europe, UK. & Asia models)
Reception sensitivity: FM: 1.5 pV/75 (It/ohms
AM: 20 pV

FM stereo separation: 35 dB (1 kHz) ,.

Rated output power: 30 W + 30 W (6 (2/0th, 1 kHz, T.H.D. 10 %)

Audio input/output jacks: LlNE1 input/output jacks, LINE2 input/output jacks, PRE OUT (with STEREO/

MONO selector switch) jack, 3.5 mm headphones jack

I CD PLAYER SECTION

Wow & flutter: Below measurable limits (i0.001 °/o W.peak)
Sampling frequency: 44.1 kHz
Optical source: Semiconductor

l CLOCK, TIMER SECTION

Clock system: Power source synchronous system
Timer functions: Everyday timer (1 setting)

Once timer (1 setting)

Sleep timer (maximum 60 min.)

I GENERAL
i Power supply: AC 120 V, 60 Hz (U.S.A. & Canada model) ,-
AC 230 V, 50 Hz (Europe, UK. & Asia models)
, Power consumption: 70 W (U.S.A. & Canada model)
I 65 W (Europe, UK. & Asia models)
1 Maximum external dimensions: 210 (W) x 135 (H) x 381 (D) mm (8-17/64 x 5-5/16 x 15")
(including feet, controls and terminals)
Mass: 5.5 kg (12 lbs. 2 oz)

1 I REMOTE CONTROL UNIT (RC-877)

Remote control system: Infrared pulse
Number of buttons: 39
Power Supply: Two DC 1.5 V ROS/AAA batteries
Maximum external dimensions: 61 (W) x 188 (H) x 26 (D) mrn (2-13/32 x 7-13/32 >< 1-1/32)
Mass: 120 g (4.2 oz) (including batteries)

' Maximum dimensions include controls, jacks, and covers.
(W) = Width, (H) = Height, (D) = Depth

For improvement purposes, specifications and functions are subject to change without advanced notice.