DOWNLOAD Sony HCD-RG55 / HCD-RG55S / MHC-RG55 / MHC-RG55S Service Manual ↓ Size: 4.49 MB | Pages: 71 in PDF or view online for FREE

Model
HCD-RG55 HCD-RG55S MHC-RG55 MHC-RG55S
Pages
71
Size
4.49 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hcd-rg55-hcd-rg55s-mhc-rg55-mhc-rg55s.pdf
Date

Sony HCD-RG55 / HCD-RG55S / MHC-RG55 / MHC-RG55S Service Manual ▷ View online

21
HCD-RG55/RG55S
  TUNER SECTION
AM IF Adjustment
SECTION 5
ELECTRICAL ADJUSTMENTS
Procedure:
1. Set the frequency of the AM RF signal generator to 1000 kHz
(at 10 kHz step) or 999 kHz (at 9 kHz step).
2. Tune the set to AM 1000 kHz (at 10 kHz step) or 999 kHz (at 9
kHz step).
3. Adjust IFT101 so that the reading on level meter becomes in
maximum.
FM Tuned Level Adjustment
Procedure:
1. Supply a 98 MHz signal at 28 dB from the ANTENNA
terminal.
2. Tune the set to 98 MHz.
3. Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.
Adjustment Location: MAIN board
set
FM RF Signalgenerator
FM ANTENNA terminal
(JK101)
75
 coaxial
Carrier frequency : 98MHz
Modulation          : AUDIO 1kHz,75kHz
deviation (100%)
Output level         : 28dB (at 75
 open)
set
FM RF Signalgenerator
FM ANTENNA terminal
(JK101)
75
 coaxial
Carrier frequency : 98MHz
Modulation          : AUDIO 1kHz,75kHz
deviation (100%)
Output level         : 60dB (at 75
 open)
MAIN BOARD   Component side
RV101: FM  TUNED LEVEL
T101:NULL
IFT101:AM IF
Null Adjustment
Procedure:
1. Supply a 98 MHz signal at 60 dB from the ANTENNA
terminal.
2. Tune the set to 98 MHz.
3. Measure voltage between pin 21 and pin 23 of IC 101. Adjust
T101 ubtil the voltage becomes 0 V.
Adjustment Location: MAIN board
Adjustment Location:
set
AM RF Signalgenerator
AM ANTENNA terminal
(JK101)
75
 coaxial
30% amplitude
Modulation by
400Hz signal
Output level : as low as possible
set
16
 
PHONES jack(JK801)
level meter
22
HCD-RG55/RG55S
s
Adjustment Location:
RF signal waveform
VOLT/DIV:200mV
TIME/DIV:500ns
level:1.7   0.3Vp-p
IC781
IC751
49
64
1
33
32
48
16 17
33
48
49
17
16
32
64
1
IC731
- CD BOARD   (Conductor Side) -
15
14
21
8
22
7
28
1
TP731
1
2
  CD SECTION
Note:
1. CD Block is basically designed to operate without 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 10 M
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.
RF Level Check
Procedure:
1. Connect oscilloscope to TP731 pin 2.
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback, the number five track.
4. Confirm that oscilloscope waveform is clear and check RF
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
CD board
TP731 pin
GND
2
23
HCD-RG55/RG55S
6-1. CIRCUIT BOARDS LOCATION
SECTION 6
DIAGRAMS
TRANS board
MOTOR board
SENSOR (CD)board
DRIVER board
SENSOR board
CD board
VIDEO OUT board
(SPDL) MOTOR board
SUB TRANS board
MAIN board
POWER AMP board
SUB WOOFER board
PANEL board
REMOTE board
KEY board
MIC board
(EXCEPT AEP, UK model)
(AEP, UK model)
24
HCD-RG55/RG55S
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
%
: indicates tolerance.
f
: internal component.
C
: panel designation.
A
: B+ Line.
B
: B– Line.
H
: adjustment for repair.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
(
) : CD
[
] : TAPE
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
c
: digital out
• Abbreviation
CND : Canadian model
AUS
: Australian model
SP
: Singapore model
KR
: Korea model
MX
: Mexican model
AR
: Argentina model
TH
: Thai model
for printed wiring boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
x
: parts mounted on the conductor side.
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
• Abbreviation
AUS
: Australian model
SP
: Singapore model
KR
: Korea model
MX
: Mexican model
AR
: Argentina model
E2
: Central and South America model
E51
: Chiri and Peruvian model
Note: The components identified by mark 
0
 or dotted line
with mark 
0
 are critical for safety.
Replace only with part number specified.
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