Adjustment - Kenwood RXD-M31 Service Manual

Adjustment of tuner
INPUT OUTPUT
No. ITEM
SETTING SETTING
(A)
98MHz,
TUNED
1
–
LEVEL 31.2dBf (ANT INPUT)
1kHz, ±40kHz DEV
Adjustment of CD player
INPUT OUTPUT
No. ITEM
SETTING SETTING
TEST MODE : While pressing the [CD PLAY] key, plug the AC power cord into the AC outlet.
Set the senor section of
LASER
1 – the optical power meter
POWER
on the pickup lens.
Connect an oscilloscope
FOCUS
Test disc
as follows.
2 ERROR
Type 4 (+)side: RF(IC201,17pin)
BIAS
GND: VREF(test pin)
Note:
Type 4disc :SONY YEDS-18 Test Disc or equivalent.
LPF : Around 47kΩ + 390pF or so.
(a) Laser Power
0.05~0.15 mW
Pickup
Optical power meter
TUNER ALIGNMENT
ALIGN FOR
SETTING POINT
Adjust VR1 and stop
at the point where
MONO 98.0MHz
VR101
ED1 (TUNED)
goes ON.
PLAYER ALIGNMENT
ALIGN FOR
SETTING POINT
On the power
from.0.05 to
0.15mw. when the
Press the "PLAY"
key to check that diffraction grating is
–
the display is "03". correctly aligned
with the RF level of
0.8Vp-p or more
Press the "PLAY"
key. Confirm that VR201 Optimum eye pattern
the display is "05".
(b)
RF signal : AC coupled
RF signal in test mode (PLAY).
Perform the tangential and focusing offset are focused
into one point on the display. The crossing points above
and below the center shall also be looked clearly.
Adjustment of cassette deck
INPUT
NO. ITEM
SETTING
FIG.
Unless otherwise specified, set the respective switches as follows:
TAPE : NORMAL DOLBY : OFF
I Cassette mechanism unit (Adjustment of the REC / PLAY head)
Demagnetization
(1) —
and cleaning
FIG.
SCC-1727
Azimuth of the
TCC-153
(2) REC / PLAY
MTT-114
head
10kHz, -10dB
II PC board adjustment.
(E)
• Set the AUX input level
(a)
to +3dB.
BIAS
(1) • Adjust the AG for the
CURRENT
output of the deck to
become -20dB
(400Hz/12.5kHz)
(b)
ANTENNA
FM
300W
FM
75W
AM
GND
DIGITAL
OUT
OPTICAL
AUX INPUT
R L
MAIN BOARD
CN404
1 PLAY (R)
2 PLAY (L)
3 A. GND
AC voltmeter
Oscilloscope
Frequency counter
(B)
OUTPUT CASSETTE TAPE ALIGNMENT
ALIGN FOR
SETTING DECK SETTING POINTS
Demagnetize the REC / PLAY head
Recording
Power : OFF with the head eraser. Clean the REC/
head, erase
— Demagnetization, PLAY head, erase head, capstan and
head, capstan
cleaning, PLAY pinch roller using a cotton swab slightly
pinch roller
damped with alcohol.
Adjust the output to maximum and
adjust the azimuth adjustment screw
(B) PLAY for the Lissajours waveform pattern of
the oscilloscope to become close to a
RVS FWD
45˚ straight ling.
Record 400Hz and 12.5kHz alternately,
VR701(L) and adjust the bias current adjustment
(B) REC PLAY
VR702(R) potentiometer for the playback levels to
become the same.
SPEAKERS
(6–16Ω)
+
L
–
–
R
+
SUPER
WOOFER
PRE OUT
MANUAL AUTO
PANEL
OPEN/CLOSE
AC 110–120V AC 220–240V
(A) FM-MPX-SG
AC voltmeter AG
FM-MPX-SG POLAR SG
(C)
(D) AM-SG
(E)
FIG.
0dBs = 0.775V
Dummy antenna