Kenwood DM-3090 Service Manual

REMOVING AND REINSTALLING THE MAIN PARTS
MD MECHANISM SECTION
Perform steps 1 to 3 of the disassembly method to remove the
MD mechanism.
How to remove the magnetic head
(See Fig. 10-1)
1. Remove the screws (A1) x 1 pc.
10
Caution:
Take utmost care so that the magnetic head is not damaged
when it is mounted.
How to remove the cartridge holder
(See Fig. 10-2)
1. Open the roller arm lever in the arrow direction, and lower
the clamper lever to the rear side.
2. Apply +5V to the red line side of blue connector of loading
motor, push the rack gear in the arrow direction to move the
cam plate lever until tick is heard.
3. Remove the screw (B1) x1 pc., and the spring (B2) x1 pc.,
fitted to the holder arm, and shift the cartridge holder to the
left side to remove it.
How to remove the mechanism switch PWB
(See Fig. 10-3)
1. Remove the screws (C1) x 2 pcs., and remove the mecha-
nism switch PWB.
Figure 10-1
Figure 10-2
Figure 10-3
MD Mechanism
(A1)x1
ø1.7x5mm
Magnetic Head
Slider Lever
Cartridge Holder
Clampa Lever
Lack Gear
Roller Arm Lever
Loading Motor
Cam Plate Lever
(B1) x1
Ø1.7x5mm
(B2) x1
(C1)x1
Ø1.7x3mm
(C1)x1
Ø1.7x9.5mm
MD Mechanism
Switch PWB
DM-3090
5
DISASSEMBLY FOR REPAIR
DM-3090(K) COVER 97.11.29 0:18 AM y[W 10

Kenwood DM-3090 Specifications

Digital Audio Performance

frequency response (playback mode)	8 Hz ~ 20 kHz, ± 1 dB
signal to noise ratio (playback mode)	More than 100 dB
wow & flutter	Less than unmeasurable limit

Analog Specifications

analog input sensitivity / input impedance	0.5V / 22 kΩ or more
analog output level/output impedance	2.0 V / Less than 2 kΩ
headphone output	15 mW/32 Ω load

Digital Input/Output

digital input coaxial	0.5 Vp-p / 75 Ω
digital input optical	- 15 dBm ~ - 21 dBm
digital output optical	- 15 dBm ~ - 21 dBm

General Specifications

power consumption	17 W
dimensions width	440 mm (17 - 5 / 16”)
dimensions height	94 mm (3 - 11 / 16”)
dimensions depth	300 mm (11 - 13 / 16”)

Weight

weight	3.55 kg (7.9 lb)