Pc Board - Kenwood RXD-402 Service Manual

Cassette Deck adjustment
No ITEM
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
q 1 r
SPEED(NORMAL)
¡. PC BOARD ADJUSTMENT
PLAYBACK
q 1 r
LEVEL
for the output of
BIAS CURRENT
q2 r
10kHz(-30dBs).
AC voltmeter AG
ADJUSTMENT
INPUT OUTPUT
SETTING SETTING
PLAY OUT : Lch (X28,CN6 @pin), Rch (X28,CN6 C pin)
\
\
TCC-153
MTT-114
iB j
TCC-110
MTT-111
i B j
SCC-1727
3kHz
MTT-256U,
TCC-160
i B j
315Hz, 0dB
(A)
Adjust the AG
the DECK to
i B j
become
1kHz(-30dBs)/
X28, CN6
1
L OUT
L IN
GND
R OUT
R IN
5
(A)
RXD-402/452/502/552/572S/A41/A51
DECK ALIGNMENT
POINT
SETTING
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
(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.
Frequency counter
FIG.
13