Kenwood RDX-652 Service Manual page 11

QQ
3 7 63 1515 0
Cassette Deck adjustment
No ITEM
Unless otherwise specified, set the respective switches as follows:
TAPE : NORMAL
ø. Cassette mechanism unit (Adjustment of the REC / PLAY head)
Demagnetization
q 1 r
and cleaning
Azimuth of the
q 2 r
REC/PLAY head
¿. PC BOARD ADJUSTMENT
TAPE
q 1 r
TE
L 13942296513
SPEED(NORMAL)
¡. PC BOARD ADJUSTMENT
PLAYBACK
q 1 r
LEVEL
BIAS CURRENT
q2 r
www
AC voltmeter
.
RXD-652/702/752/772S/852/A81/A601/A701
ADJUSTMENT
INPUT OUTPUT
SETTING SETTING
DOLBY : OFF PLAY OUT : Lch (X28,CN64pin), Rch (X28,CN66pin)
\
\
TCC-153
MTT-114
i B j
10kHz, - 10dB
TCC-110
MTT-111
i B j
SCC-1727
3kHz
MTT-256U,
TCC-160
i B j
315Hz, 0dB
(A)
Adjust the AG
for the output of
the DECK to
i B j
become
1kHz(-30dBs)/
10kHz(-30dBs).
1
2
X28, CN1
3
L OUT
4
GND
5
R OUT
6
7
L IN R OUT
8
R IN
x ao u163
9
y
AG
10
i
11
Solder with
some lead
(A)
wires.
2 9
8
DECK ALIGNMENT
SETTING
Recording
Demagnetization:
head, erase
POWER OFF
head,capstan
Cleaning: PLAY
pinch roller
PLAY
FWD
A/B DECK
Q Q
PLAY
3 6 7 1 3 1 5
A DECK
VR 1 (L)
VR 2 (R)
PLAY
B DECK
VR 7 (L)
VR 8 (R)
Adjust the REC VR
level so that the line
out is -2.6dBs at
VR 3 (L)
1kHz, and record
VR 4 (R)
and playback
1kHz/10kHz alter-
nately.
co
AC voltmeter
Oscilloscope
.
(B)
9 4 2 8
ALIGN FOR
POINT
0dBs=0.775V
Demagnetize the
REC / PLAY head
with the head eras-
er.Clean the REC /
PLAY head, erase
head,capstan and
pinch roller using a
cotton swab slightly
damped with alcohol.
Adjust the output to
maximum and adjust
the azimuth adjust-
ment screw for the
Lissajours waveform
pattern of the oscillo-
scope to become
RVS
close to a 45°
straight line.
Adjust the tape
speed so that 3kHz
0 5 8 2 9 9 4 2 8
VR 5 is obtained at the
center of the tape.
Adjust the playback
output to -6.0dBs
Record 1kHz and
10kHz alternately,
and adjust the bias
current adjustment
potentiometer for the
playback levels to
become the same.
m
Frequency counter
9 9
FIG.
9 9
11