4-6
CCP-1100SF
4-2-8. Record level and frequency
characteristics adjustment
Note : Before this adjustment, the bias current pre-adjustment must has
been finished.
Test equipment :
Voltmeter
Level meter
High quality cassette player
60-minute cassette tape
Adjustment point : RV3, RV4/AU-2 board
Procedure :
1.
Disconnect the connector CN2 on the AU-2 board and
connect the CN5 instead.
2.
Set the SIDE selector to “A
+
B”.
3.
Turn the Power switch ON.
4.
Set a 60-minute cassette tape to the ORIGINAL side
of CCP-1100SF, and blank tapes for measurement to
COPY side.
5.
Connect a “
+
” terminal of oscillator to the TP7 and a
“
_
” terminal to the E7. Press the COPY button while
entering the 0 dB 5 kHz signal.
6.
After copying is finished, playback the copied tape
with a high quality cassette player to adjust each RV
(on the AU-2 board) for record level adjustment so
that the level is
_
1.5
±
1 dB.
CH
Adjustment point
CH-1
RV3
CH-2
RV4
Note : Turn clockwise RV3, RV4 for higher level.
AU-2 Board Component Side
TP7
E7
CN2
CN5
RV3
RV4
AU-2 Board Component Side
C14
C34
L1
L2
CT2
CT1
+
3 dB
_
2 dB
_
6 dB
315 Hz
6.3 KHz
10 KHz
7.
With the oscillator connection maintained, press the
COPY button while entering the following signals.
_
20 dB, 5 kHz
_
20 dB, 100.8 kHz
_
20 dB, 160 kHz
8.
Then, playback the copied tape with a standard
cassette player, and repeat adjustment and replacement
of adjust capacitor, coil and trimmer capacitor so that
the level in each frequency satisfies the specification.
CH
Adjustment point
6.3 kHz
10 kHz
both
CH-1
C14
L1
CT1
CH-2
C34
L2
CT2
Note : Larger capacitance raises high frequency range.