Cassette Deck Adjustment - Kenwood RXD-652 Service Manual

Cassette Deck adjustment

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Unless otherwise specified, set the respective switches as follows:
TAPE : NORMAL DOLBY : OFF
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
10kHz, - 10dB
¿. PC BOARD ADJUSTMENT
TAPE
q1 r
SPEED(NORMAL)
¡. PC BOARD ADJUSTMENT
PLAYBACK
q1 r
LEVEL
Adjust the AG
for the output of
BIAS CURRENT
q2 r
1kHz(-30dBs)/
10kHz(-30dBs).
AC voltmeter AG
RXD-652/702/752/772S/852/A81/A601/A701
ADJUSTMENT
INPUT OUTPUT
SETTING SETTING
PLAY OUT : Lch (X28,CN64pin), Rch (X28,CN66pin)
\
\
TCC-153
MTT-114
iB j
TCC-110
MTT-111
iB j
SCC-1727
3kHz
MTT-256U,
TCC-160
iB j
315Hz, 0dB
(A)
the DECK to
iB j
become
1
2
X28, CN1
3
L OUT
4
GND
5
R OUT
6
7
L IN R OUT
8
R IN
9
10
11
Solder with
some lead
(A)
wires.
DECK ALIGNMENT
SETTING
POINT
Recording
Demagnetization:
head, erase
POWER OFF
head,capstan
Cleaning: PLAY
pinch roller
PLAY
FWD
A/B DECK
PLAY
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.
AC voltmeter
Oscilloscope
Frequency counter
(B)
ALIGN FOR
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
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.
FIG.
11