Kenwood L 09 M Service Manual

Page 1

KENWOOD

HI/Fl STEREO COMPONENTS

L-OQM

NOTE
The detailed descrlptlon on Clrcuvt descriptions" 7 Cascade, Constant current, and A50
circuitry ~ is written in the L-07M and the KA-8100 service manual.

9 KENWDOD

DC POWER AMPLIFIER

Page 2

CONTENTS

EXTERNAL VIEW ...................................................................... 3
INTERNAL VIEW ..................................................................... 4
DISASSEMBLY FOR REPAIR V. 5
BLOCK DIAGRAM ................... 6
CIRCUIT DESCRIPTION ......................................... I. 6
DESTINATIONS' PARTS LIST ............................. 11
PARTS LIST ,. 12
SEMICONDUCTOR SUBSTITUTIONS .. 13
TROUBLESHOOTING .............................................................. 14
ADJUSTMENT .......................................................................... 15
PC BOARD

POWER SUPPLY (X00-1940-10) .......................................... 16

POWER AMP (A) (X07-155040) ......................................... 16

POWER AMP (B) (XO7-1560-10) .. 16
SCHEMATIC DIAGRAM ................. . .. 17
SPECIFICATIONS ..................................................................... 18

Page 18

6.

Note: Kenwood follows a policy of continuous advancements in development. For this reason specifications may be changed without notice.

18

SPECIFICATIONS

Model L-09M (Single Channel Power Amplifier)

Specifications described here are based on the measured values at the tip of the Special
Speaker Cable provided, at its connection to Model L-09M.

PERFORMANCE
Power Output

*
300 watts minimum power, RMS at 8 ohms from
20 Hz to 20,000 Hz with no more than 0.02%
total harmonic distortion.
Continuous Power -------------------- 300 watts 8 ohms at 1000 Hz
400 watts'4 ohms at 1,000 Hz

Dynamic Power Output - - - - 1,000 watts 4 ohms at 1,000 Hz

Total Harmonic Distortion ---------------- 0.02% at rated power output into 8 ohms
IT.H.D.I 20 Hz ~ 20 kHz
001% at 30 watts into 8 ohms 20 Hz ~
20 kHz

0.003% at rated power into 8 ohms 1 kHz
0.003% at 30 watts into 8 ohms 1 kHz
0.02% at rated power into 4 ohms 1 kHz
Intermodulation Distortion --------------- 0.007% at rated power into 8 ohms
(60 Hz : 7 kHz = 4 : 1) 0.003% at 30 watts into 8 ohms
0.02% at rated power into 4 ohms

Frequency (Response ----------------- DC ~ 50,000 Hz +0, -1.0 dB
_ DC ~ 100,000 Hz +0, 72.0 dB
Signal to Noise Ratio ------------------ 120 dB (short-circuited)
lIHF - A Curve)
Residual Noise (IHF - A Curve) ----------- 50 11V
Damping Factor ----------------------- 200 into 8 ohms load
250 into 8 ohms load without Speaker Cable
Input Sensitivity/Impedance --------------- 1 V/EO k ohms
Speaker Impedance .................... Accept 4 ohms to 16 ohms
Speaker Cable Loss .................... 001 ohms
GENERAL
Power Consumption -------------------- 1,190 watts at full power
60 watts at non-signal
AC Outlet """"""""""""""" 1 UNSWITCHED (Maximum 200 watts)
Dimensions """""""""""""""" W 18-29/32" (480 mm)
H 646/32" (154 mm)
D 16-1/8" (409.5 mm)
Weight (Net) ------------ - ' ' : """"" 47.2 lbs. (21.4 kg)
(Gross) ----------------------- 49.81 lbs. (22.6 kg)

* Measured pursuant to Federal Trade Commission's Trade Regulation rule in U.S.A. on Power
Output Claims for Amplifier.

KENWOOD ELECTRONICS, INC.

.157 SOUTH BROADWAY, GARDENA, CALIFORNIA 00240 U.S.A.
I15 SEAVIEW DRIVE SECAUCUS, NEW JERSEY 07004 U.S.A.

TRIO-KENWOOO ELECTRONICS N.V.'
ILEUVENSESTEENWEG 1114, 5-1900 ZAVENTEM, BELGIUM.

TRIO-KENWOOO ELECTRONICS Gmbl-l.
.6056 HEUSENSTAMM, RUDDlF-BRAAS-STR. 20, WEST GERMANY. ' ~ V. . .

TRIO-KENWOOO FRANCE SA.
I 5, BOULEVARD NEY 75018 PARIS, FRANCE. I '

TRlO-KENWOOO CORPORATION

[3-6-17 AUBADAI, MEGURU-KU, IUKYU, JAPAN.

A 1971-8 PRINTED INJAPAN 351-0461-00161 3,420