Kenwood DM-3090 Service Manual

Yes
• Normal playback
Is initialization performed normally when high reflection disc is
played back?
Does disc rotate normally?
No No
Check IC1201
Is lead-in switch turned on in the TEST mode when the pickup is on
the innermost periphery (Is the pin 6 of OC1401 on L level?)
No
No
Check SW1953, mechanism switch PWB soldering joint, and
CNP1601 pin 1 periphery.
Is an attempt to read repeatedly the TOC section of low reflection
disc made?
Since the TOC section has not been recorded on the new disc,
replace it with recorded low reflection disc.
No
Yes
Check the assembly position of "lead-in switch (sw1953)
Yes
When it has been confirmed that EEPROM value is normal in the TEST mode
Does the playback time display advance?
• Audio playback circuit
Yes
No
Is audio output waveform observed on the pins 22 and 24 of
CNS1902?
Check connection between IC1701 and CNS1902.
No
Check the main PWB.
Yes
When sound is not output although the playback time display advances during
(Except DM-3090)
playback in the normal mode.
Is audio output waveform observed on the pins 24 to 26 of
IC1701?
Check the pins 70, 71, 72 and 74 of IC1201, and the pins
12, 16, 17, and 19 of IC1701.
DM-3090
21
TROUBLE SHOOTING
DM-3090(K) COVER 97.11.29 0:19 AM y[W 30

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)