Kenwood DM-3090 Service Manual

DM-3090
23
TROUBLE SHOOTING
• Disc motor fails to run
No
Check soldering joint and parts of pins 24 and 25 of IC1201, and
peripheral circuit.
Does waveform appear on the pins 24 and 25 of IC1201 in the
TEST mode focus gain coarse adjustment step?
Yes
No
Does waveform appear on the pins 34 and 35 of IC1601, pins
1 and 2 of CNP1603?
Check soldering joint of PWB of completed IC1601 and CNP1601
disc motor.
Yes
Replace the completed disc motor.
• Tracking servo failure
No
Does waveform appear on the pins 8 and 9 of IC1601, and pins
1 and 3 of CNS1101 in the TEST mode focus gain adjustment
step?
Yes
Replace the optical pickup.
Check the soldering joint of pins 20 and 21 of IC1201, IC1601,
IC1601, CNS1101.
• Slide servo failure
Yes
Check the waveform on the pins 22 and 23 of IC1201, check the
peripheral parts and soldering joint.
Does the pickup move to external and internal periphery when
the or button is pressed in the TEST mode?
No
No
Is there any change on the pins 22 and 23 of IC1201 when the
or button is pressed?
Check the waveform on the pins 22 and 23 of IC1201, check the
peripheral parts and soldering joint.
Yes
Is there any change on the pins 28 and 29 of IC1601, and the
pins 1 and 2 of CNP1602 when the or button is
pressed?
No
Yes
Does voltage on the positive and negative terminals of slide
motor change when the or button is pressed?
Check the soldering joint of IC1601 and CNP1602.
No
Check the soldering joint connected to the slide motor to see
whether there is wire breakage.
Yes
Replace the slide motor.
DM-3090(K) COVER 97.11.29 0:20 AM y[W 34

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)