Kenwood DM-3090 Service Manual

• Disc loading is not normal.
Is disc loaded when it is inserted?
No
Yes
No
Check IC1401.
No
Check CNP1601 and SW1956.
Yes
No
Check CNP1604 and IC1601.
Yes
Check CNP1604 and CN1604
No
Yes
No
Yes
Is change observed on the pin 23 or 24 of IC1601?
Is change observed on the pin 30 or 31 of IC1601?
Is ejection performed when the MD taking-out button is
pressed?
Yes
Disc retracts soon after completion of disc ejection.
Yes
Check CNP1601 and SW1956.
Is the pin 4 of CNP1601 set to L state?
• Playback state cannot be set.
Is it impossible to set both high reflection disc and low
reflection disc to playback state?
Yes
Check as stated in item "TEST mode check".
No
Only the high reflection disc cannot be played back.
Yes
Is 1.02V±0.3V (high reflection disc) applied to the pin 93 of
IC1401 in the TEST mode where the high reflection disc has
been inserted?
Only the low reflection disc cannot be played back.
Is 3.2V±0.3V(record enabied) or 2.06V± 0.3V (record disabled)
applied to the IC1401 pin 93 after the low reflection disc has been
set?
No
Yes
No
After adjustment check as stated in item "Normal playback".
Check SW1951A/B, mechanism switch PWB, and CNP1601.
Yes
Yes
No
DM-3090
20
TROUBLE SHOOTING
DM-3090(K) COVER 97.11.29 0:19 AM y[W 27

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)