Sony HCD-RX33 Service Manual ▷ View online
— 10 —
2.
Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.
3.
Mode: Playback
4.
After the adjustments, apply suitable locking compound to the
parts adjusted.
parts adjusted.
Adjustment Location:
Remove the cassette lid before adjustment (See page 8)
Remove the cassette lid before adjustment (See page 8)
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
Tape Speed Adjustment (Deck A)
Procedure:
1.
1.
Mode: Playback
2.
Adjust the SFR201 so that the frequency counter reads 3,000
Hz ± 90Hz.
Hz ± 90Hz.
Adjustment Location: MAIN board
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
[MAIN BOARD] — Component side —
CN204
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
2dB
2dB
within 2dB
L-CH
peak
peak
screw
position
position
R-CH
peak
peak
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
SPEAKER
terminal (JK501)
(L-CH)
terminal (JK501)
(L-CH)
set
L
R
oscilloscope
SPEAKER
terminal (JK501)
(R-CH)
terminal (JK501)
(R-CH)
Waveform of oscilloscope
in phase
45˚
90˚
135˚
180˚
good
wrong
SPEAKER
terminal (JK501)
terminal (JK501)
set
frequency counter
+
–
–
SFR201
Tape Speed
Adjustment screws
REC/PB head (deck A)
or PB head (deck B)
REC/PB head (deck A)
or PB head (deck B)
— 11 —
TUNER SECTION
0 dB=1µV
AM Tuning Voltage Adjustment
Procedure:
1.
1.
Set the reception frequency of the unit to 531 kHz.
2.
Adjust L108 for 1.2 ± 0.05 V reading on the DC voltmeter.
3.
Set the reception frequency of the unit to 1,602 kHz.
4.
Confirm that the voltage reading on the DC voltmeter is within
8.0 ± 0.5 V.
8.0 ± 0.5 V.
Adjustment Location: MAIN board (See page 12)
AM Tracking Adjustment
Procedure:
1.
1.
Tune the set to 600 kHz.
2.
Set the output of AM RF SSG so that the input level of the set
will become 60 dB (µV/m).
will become 60 dB (µV/m).
3.
Adjust L107 so that when the waveform on the oscilloscope is
maximum, no noise appears.
maximum, no noise appears.
4.
Tune the set to 1,400 kHz.
5.
Adjust TC101 so that when the waveform on the oscilloscope
is maximum, no noise appears.
is maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
capacitors.
Adjustment Location: MAIN board (See page 12)
TP1
+
DC voltmeter
Main board
–
F
G
VT
G
VT
AM RF SSG
loop antenna
set
loop antenna
(Supplied accessories)
(Supplied accessories)
60 cm
AM ANTENNA
terminal (TM1)
terminal (TM1)
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
Field strength dB (
µ
V/m) =SSG output level dB (
µ
V/m) –26 dB.
— 12 —
FM Tuned Level Adjustment
set
Procedure:
1.
1.
Supply a 28 dB 98 MHz signal from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Adjust SFR101 to the point (moment) when the TUNED
indicator will change from going off to going on.
indicator will change from going off to going on.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] — Component side —
JK501
JK101
L108
TC101
L107
SFR101
IC102
TP1
IC103
AM
Tracking
Tracking
AM Tuning
Voltage
Voltage
FM Tuned Level
FM RF SSG
Carrier frequency : 98 MHz
Modulation
Modulation
: AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level
: 28 dB (at 75
Ω
open)
FM ANTENNA terminal
(JK101)
(JK101)
75
Ω
coaxial
— 13 —
IC03
VR02
VR01
R07
IC01
CN12
Focus Gain
Focus Bias
RF Level
CD SECTION
Note:
1.
CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.
adjustment. Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
when the signal level is low than specified value with the
following checks.
5.
Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
RF Level Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (RF) on CD DECODER
board.
board.
2.
Turned Power switch on.
3.
Put disc (YEDS-18) in and playback.
4.
Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
signal level is correct or not.
Note: Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
oscilloscope
level: 1.0 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
+0.3
–0.2
–0.2
Adjustment Location: CD DECODER board
Procedure:
1.
1.
Connect DC voltmeter to test point CN12 (FEO), (VC) on CD
DECODER board.
DECODER board.
2.
Turned Power switch on.
3.
Put disc (YEDS-18) in and stop.
4.
Adjust VR01 so that the DC voitmeter reading is 0 ± 20 mV.
Adjustment Location: CD DECODER board
Focus Gain Adjustment (VR02)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjusment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
There is no problem.
Therfore, do not perform this adjusment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location
[CD DECODER BOARD] — Component side —
CD DECODER
board
board
CN12
FEO
VC
DC voltmeter
+
–
CD DECODER
board
board
TP (RF)
CN12 (VC)
CN12 (VC)
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