Block Diagram - Kenwood KAC-Q62 Service Manual

KAC-Q62 KAC-Q62
CONNECTIONS
Point! Graphic Equalizer
This unit is a power amplifier incorporating a graphic equalizer. The 5-band
graphic equalizer provides signal equalization for the amplifier.
2. See
Q: 4 i= eC Equalizer
(RENWOOD. The temperature rises high during
operation. Do not touch the graphic
equalizer panel or there is a danger of burns.
When turning the controls, use a coin or a
flat-blade screwdriver.
@ Adjustment
Adjust the level of each frequency band as desired.
+ To increase the level:
Turn the controi of the band you wish to adjust to the right.
+ To decrease the level:
Turn the control of the band you wish to adjust to the left.
Flat
eo We
If the treble or bass control is increased on the center unit and the graphic equalizer
levels are increased at the same time, the sound may be distorted. Please adjust the
graphic equalizer taking the balance with the positions of the treble and bass controls
of the center unit into consideration.
Point 2 Flexibility
KAC-Q62 is compatible with a large variety of systems by combining the
switches and functions described in the following.
[1]Operation switch
This switch selects the input method of the signals to be OPERATION
amplified by amps A and B.
+ STEREO position
The input eft and right signals are amplified separately. Use this position when the
unit is used as a Stereo amplifier.
» MONO(L) position
The input teft signal is amplifted twice the norma! boost level. Use this position
when the unit is used as a high-power monaural amplifier. (The mnput right signal is
not output.)
—
STEREO MONO [L)
iN}
Filter switch
These switches allow filtering of the output signals. FILTER
+ HPF(High Pass Filter) position (12dB/oct. cee Gee
slope)
Only frequencies of 80Hz or higher are output. (Frequencies below 80Hz are cut. }
* OFF position
The original sound without filtering 1s output
Input sensitivity
Adjust this contro! according to the pre-out level of the center unit
connected to this amp.
Center unit Amplifier INPUT
SENSITIVITY pre-out jevel | input sensitivity
Refer to "Specifications" on
MAX (0.15 V) the center unit's instruction
manual about the pre-out
level
System Examples
By combining the switches and functions of the KAC-Q62, you can
implement a wide range of audio system configurations.
@ Example 1
A high-power system can be implemented by combining two units of
KAC-Q62.
Left L
Center unit Left
(Cassette receiver etc.) speaker
Switch settings
Right
OPERATION speaker
—
STEREO MONO IL)
@ Example 2
Center unit Ye Satellite
(Cassette receiver etc.) ([]a speaker
q Subwoofer
Switch settings
witcn setting
¢ {Monaural}
FILTER
HPF OFF
OPERATION
ge
——? a
STEREO MONO iL)
WSet the Low pass filter switch to ON and set
the frequency control to the 80Hz position.
« Use a power amplifier equipped with the low
pass filter function (KAC-1023/923/823 etc.}.
* For details on the system connection, power
connection, etc., please refer to the
instruction manual provided with your power
amplifier.
Point3 Tri-mode
With the KAC-Q62, a subwoofer can be added easily to the speaker system
by making use of the properties of coils and capacitors. This mode of
operation is called Tri-mode.
B Principle of Tri-mode
e Method of frequency band division using a coil and
capacitor ... in case of 6 dB/oct. slope
L Output e
">" N §
ac
Crossover Frequency
c Frequency
Output jutpur
Frequency Frequency
* Coil (L) : Passes low frequencies and blocks high frequencies. (Low pass}
+ Capacitor (C} : Passes high frequencies and blocks low frequencies. (High pass)
e Your coi] and capacitor
Use the following formula to identify the coil and capacitor you need in your system.
159000 159 X R
= —— (pF) Le
fe xR fc
Example :
When tt is required to set a crossover frequency of 120 Hz using speakers with an
impedance of 4 ohms, Prepare commercially-available coil and capacitor with the
closest ratings to the results calculated from the formula above. The capacitor rating
should be as close as possible to 331.25 (uF) and the coil rating should be as close
as possible to 5.3 (mH).
@ System example
To use the Tri-mode configuration, set the OPERATION switch to the STEREO
position.
= Subwoofer
(L+R)
Compose the speaker system so that the overall speaker impedance seen from the
amplifier unit is no less than 2 ohms. If the impedance is less than 2 ohms, excessive
current may flow and the amplifier unit may be damaged.
fc=Crossover Frequency (Hz)
(MH) — ReSpeaker Impedance {2}
KAC-Q62
NORMAL
HPF
Q103~108 Q203~208
A CLASS POWER
i in i;
+B
1C101
Q102 Q202
1C105
BLOCK DIAGRAM
800 3.2K 12.8K(Hz)
200
re
io
oJ
a
Con 6 ron
ta] | e+
ahs Li
oN
oo
-N
ag
Q112, 212
z
Eo
wS
Cw
cr
20
Ce
a
PRE +B
LED 1 aA
IC 2 +15V
ima |
IC3 —15V
(- 25V)
PROTECTION
IC 102
CONVERTER
Q5~Q8
osc
«
2
S58
tol EB
og]e
z
9
rs)
I
a
b 6
z :
|
fe) d
og a
1a
a
PRE -B
GND