No
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ITEM
Demagnetization
and cleaning
Azimuth of the
REC/PLAY head
TAPE
SPEED(NORMAL)
PLAYBACK
LEVEL
BIAS CURRENT
INPUT
SETTING
–
TCC
−
153
MTT
−
114
10kHz,
−
10dB
TCC
−
110
MTT
−
111
SCC
−
1727
3kHz
(A)
Adjust the AG
for the output of
the DECK to
become 400Hz
(-20dB)/12.5kHz
(-20dB)
MTT
−
150
400Hz
Adjust the playback
output to -2.5dBs
OUTPUT
SETTING
–
(B)
(B)
(B)
(B)
DECK
SETTING
Power : OFF
Demagnetizatio
n,cleaning,
PLAY
PLAY
PLAY
PLAY
REC
↕
PLAY
ALIGNMENT
POINT
Recording
head, erase
head,capstan
pinch roller
FWD RVS
A DECK
VR 5
B DECK
VR 6
A DECK
VR 7 (L)
VR 8 (R)
B DECK
VR 1 (L)
VR 2 (R)
VR 3 (L)
VR 4 (R)
ALIGN FOR
Demagnetize the
REC / PLAY head
with the head
eraser.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
adjustment screw for
the Lissajours
waveform pattern of
the oscilloscope to
become close to a
45° straight line.
Adjust the tape
speed so that 3kHz
is obtained at the
center of the tape.
Record 400Hz and
12.5kHz alternately,
and adjust the bias
current adjustment
potentiometer for the
playback levels to
become the same.
FIG.
Unless otherwise specified, set the respective switches as follows:
0dBs=0.775V
TAPE : NORMAL DOLBY : OFF PLAY OUT : Lch (X28,CN6
1
pin), Rch (X28,CN6
4
pin)
ø
. Cassette mechanism unit (Adjustment of the REC / PLAY head)
¿
. PC BOARD ADJUSTMENT
¡
. PC BOARD ADJUSTMENT
5. Cassette Deck adjustment
{
(A)
(B)
X28, CN6
L IN
L OUT
R OUT
R IN
GND
1
5
AC voltmeter
AG
Oscilloscope
AC voltmeter
Frequency counter
14
ADJUSTMENT
RXD-951/A700/A900/V616/V818/V919
RXD-951
1P
98.12.14
16:18
y [ W 3
