Kenwood KAC-748 - Manual (Page 11)

Troubleshooting Guide
What might appear to be a malfunction in your unit may Just be thé result of slight
misoperation or miswiring. Before calling service, first check the following table for possible
problems.
PROBLEM POSSIBLE CAUSE SOLUTION
No sound.
(No sound from one side.)
• Input (or output) wires are
disconnected.
• Protection circuit may be
activated.
• The fuse may be blown because
the volume was too high.
• Connect the input (or output)
wires.
• Check connections by referring
to ’Protection function*.
• Replace the fuse with a new
fuse and use a lower volume.
The output level is too
small (or too large). The input sensitivity adjusting
control is not set to the correct
position.
Adjust the control correctly
referring to "Controls".
The sound quality is bad.
(The sound is distorted.)
•The speakers wire are
connected with wrong 0 / ©
polarity.
• A speaker wire is pinched by a
screw in the car body.
• The switches may be set
improperly.
• Connect them properly checking
the © / 0 of the terminals and
wires well.
• Connect the speaker wire again
so that it is not pinched by
anything.
• Set switches properly by
referring to ’System examples’.
Specifications
Specifications subject to change without notice.
Audio Section....................... ............................. KAC-848
Max Power Output (4 Q)
4 Channel Mode................................................................... 100 W x 4
3 Channel Mode.............................................. 100 W x 2 + 300 W x 1
2 Channel Mode.................................................................. 300 W x 2
Rated Power Output {4 Q)
4 Channel Mode {20 Hz - 20 kHz, less than 0.08 % THD).....50 W x 4
3 Channel Mode (1 kHz, 0.08 % THD) + (1 kHz, 0.8 % THD)
.......................................................................... 5 0 W x 2 + 1 5 0 W x l
2 Channel Mode (1 kHz, 0.8 % THD)...................................150 W x 2
Rated Power Output (2 £i)
4 Channel Mode (1 kHz, 0.8 % THD).....................................75 W x 4
Frequency Response (+0, -1 dB)......................................5 Hz ~ 50 kHz
Signal to Noise Ratio................................................................... 100 dB
Sensitivity (MAX) {rated output)........................................................0.15 V
(MIN) (rated output)........................................................... 4.0 V
Input Impedance.................................................................................. 10 kil
Low Pass Filter Frequency (12 dB/oct.) (Variable)............. 50 - 200 Hz
High Pass Filter Frequency (12 dB/oct.) (Variable)............ 50 ~ 200 Hz
General............................................................. KAC-848
Operating Voltage (11 ~ 16 V allowable)..........................................14.4 V
Current Consumption (1 kHz, 10 % THD)........................................... 38 A
Dimensions (W x H x D)...........................................290 x 56 x 280 mm
(11-7/16x2-3/16x11 in.)
Weight................................................................................ 4.3 kg (9.4 lb)
KAC-748
70 Wx4
70 W x 2 + 200 W x 1
200 W
X
2
35 W
X
4
3 5 W x 2 + l O O W x l
1 0 0 W x 2
5 0 W x 4
5 Hz ~ 50 kHz
100 dB
0.T5V
4.0 V
lOkfl
50 - 200 Hz
50 - 200 Hz
KAC-748
14.4 V
28 A
290 X 56 x 230 mm
(11 -7/i 6X2-3/16XÎ9-1/16 in.)
3.7 kg (8.1 lb)
Engfish 11