Sony XR-C653SP Service Manual ▷ View online
– 21 –
TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
its internal block is difficult to repair.
Procedure :
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
1. Set to the test mode.
2. Push the SOURCE button and set to FM.
Display
FM Auto Scan/Stop Level Adjustment
Setting :
SOURCE button : FM
3. Push the preset 3 button.
Display
4. Adjust with the volume RV2 on TU1 so that the “FM” indica-
tion turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Display
0 dB = 1 µV
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
Scan/Stop Level and MW Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “POWER SELECT” switch (S501) is “ON” position.
2. Turn ON the regulated power supply. (All LEDs on the set lights
1. Set the “POWER SELECT” switch (S501) is “ON” position.
2. Turn ON the regulated power supply. (All LEDs on the set lights
up, and the clock is displayed.)
Note : Press the OFF button, if the clock is not displayed.
3. Push the preset 4 button.
4. Push the preset 5 button.
5. Press the preset 1 button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
3. Push the preset 4 button.
4. Push the preset 5 button.
5. Press the preset 1 button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test Mode>
1. Push the OFF button.
2. Set the “POWER SELECT” switch (S501) is “OFF” position.
1. Push the OFF button.
2. Set the “POWER SELECT” switch (S501) is “OFF” position.
Note on Adjustment
The adjustments of tuner section, should be performed according
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. MW Auto Scan/Stop Level Adjustment
4. FM Polar VCO Frequency Adjustment
5. FM Polar Sub Carrier Adjustment
to the following sequence.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. MW Auto Scan/Stop Level Adjustment
4. FM Polar VCO Frequency Adjustment
5. FM Polar Sub Carrier Adjustment
Carrier frequency : 98.00 MHz
Output level
Output level
: 22 dB (12.6 µV)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
FM RF signal
generator
0.01 µF
set
antenna
terminal
terminal
Adjustment Location : See page 24.
SHUF1
SHUF1
SHUF1
– 22 –
antenna
terminal
terminal
LINE OUT REAR
MW Auto Scan/Stop Level Adjustment
Setting :
SOURCE
n MODE button : MW
AM RF signal
generator
AM dummy
antenna (50
antenna (50
Ω
)
set
15 pF
30
Ω
65 pF
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
output level
30% amplitude
modulation by
1 kHz signal
output level
: 33 dB (44.7 µV)
FM RF signal
generator
set
0.01 µF
10 k
Ω
level meter
FM Stereo Separation Adjustment
Setting :
SOURCE button : FM
Carrier frequency : 98.00 MHz
Output level
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main : 1 kHz, 20 kHz deviation (26.5%)
sub
sub
: 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot : 7.5 kHz deviation (10%)
L-CH stereo separation : A – B
R-CH stereo separation : C – D
The separations of both channels should be equal.
R-CH stereo separation : C – D
The separations of both channels should be equal.
Specification : Separation more than 28 dB
Adjustment Location : See page 24.
FM stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV4 on TU1 for
minimum reading.
minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1 for
minimum reading.
minimum reading.
Procedure :
Procedure :
1. Set to the test mode. (See page 21.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
1. Set to the test mode. (See page 21.)
2. Push the SOURCE button.
3. Push the MODE button and set to MW.
Display
4. Push the preset 3 button.
Display
5. Adjust with the volume RV1 on TU1 so that the “MW” indica-
tion turns to “MW0” indication on the display window. But, in
case of already indicated “MW0”, turn the RV1 so that put out
light “0” indication and adjustment.
case of already indicated “MW0”, turn the RV1 so that put out
light “0” indication and adjustment.
Display
Adjustment Location : See page 24.
SHUF1
SHUF1
SHUF1
antenna
terminal
terminal
antenna
terminal
terminal
main board
TP402 (SUB)
TP402 (SUB)
antenna
terminal
terminal
main board
TP401 (VCO)
TP401 (VCO)
FM Polar VCO Frequency Adjustment
Setting :
SOURCE
n MODE button : FM2
FM RF signal
generator
set
frequency
counter
Carrier frequency : 69.50 MHz (FM2 : 3CH)
Output level
Output level
: 60 dB (1 mV)
Procedure :
1. Connect the frequency counter to the TP401 (VCO) on main
1. Connect the frequency counter to the TP401 (VCO) on main
board.
2. Push the SOURCE button.
3. Push the MODE button and set to FM2.
4. Push the preset 3 button.
5. Adjust RV402 so that the reading on the frequency counter
3. Push the MODE button and set to FM2.
4. Push the preset 3 button.
5. Adjust RV402 so that the reading on the frequency counter
becomes to 31.25 ± 0.1 kHz.
Adjustment Location : See page 24.
FM RF signal
generator
set
level meter
FM Polar Sub Carrier Adjustment
Setting :
SOURCE
n MODE button : FM2
Carrier frequency : 69.50 MHz (FM2 : 3CH)
Output level
Output level
: 60 dB (1 mV)
Procedure :
1. Connect the level meter to the TP402 (SUB) on main board.
2. Push the SOURCE button.
3. Push the MODE button and set to FM2.
4. Push the preset 3 button.
5. Set the modulation frequency of the FM RF signal generator to
1. Connect the level meter to the TP402 (SUB) on main board.
2. Push the SOURCE button.
3. Push the MODE button and set to FM2.
4. Push the preset 3 button.
5. Set the modulation frequency of the FM RF signal generator to
1 kHz (10 kHz div.).
6. Then output level is supposing that 0 dB.
7. Set the modulation frequency of the FM RF signal generator to
7. Set the modulation frequency of the FM RF signal generator to
31.25 kHz (10 kHz div.).
8. Adjust L401 so that the reading on the level meter becomes to
maximum.
9. Adjust RV401 so that the reading on the level meter becomes to
13.0 ± 0.5 dB.
Adjustment Location : See page 24.
Adjustment Location :
–set upper view–
–set bottom view–
TAPE SPEED
ADJ
RV261
(R-CH)
RV251
(L-CH)
(L-CH)
DOLBY
LEVEL
ADJ
TU1
RV1 MW AUTO SCAN/STOP LEVEL ADJ
RV2 FM AUTO SCAN/STOP LEVEL ADJ
RV4 FM STEREO SEPARATION ADJ
L401
RV401
RV402 FM POLAR VCO FREQUENCY ADJ
FM POLAR SUB CARRIER ADJ
TP202 (DOLBY-R)
TP201 (DOLBY-L)
DOLBY
LEVEL
ADJ
LEVEL
ADJ
TP402 (SUB)
FM POLAR SUB
CARRIER ADJ
FM POLAR SUB
CARRIER ADJ
TP401 (VCO)
FM POLAR VCO
FREQUENCY ADJ
FM POLAR VCO
FREQUENCY ADJ
– 24 –
– 23 –
6-1. IC PIN DESCRIPTION
• IC501 µPD78058GC-906-3B9 (SYSTEM CONTROL)
• IC501 µPD78058GC-906-3B9 (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1
ILL.IN
I
Illuminator line detection input
2
ST
I/O
Used inconjunction with STEREO input/MONO output. (FM mode)
3
SD IN
I
Station detector detection input
4
AVSS
—
GND for A/D conversion.
5
LCDANG
O
Output for LCD view angle adjustment.
6
PLL CE
O
PLL serial chip enable output
7
AVREF
—
Reference voltage for D/A conversion.
8
PLL SI
I
PLL serial data input
9
PLL SO
O
PLL serial data output
10
PLL CKO
O
PLL serial clock output
11
COLSEL
I
Illuminator color initial setting
12
LCDSO
O
LCD serial data output
13
LCDCKO
O
LCD serial clock output
14
LCDCE
O
LCD serial chip enable output
15
LCDINH
O
LCD blank display control output
16
UNISI
I
Serial data input
17
UNISO
O
Serial data output
18
UNICKI
I
Serial clock input
19
UNICKO
O
Serial clock output
20
BUSON
O
BUS ON control output
21
SYSRST
O
System reset control output
22
AMPON
O
Power amplifier power control output
23
TU ON
O
TUNER power control output
24
FM ON
O
FM power control output
25
PW ON
O
System power control output
26
ILLON
O
Illumination power control output
27
COLOR
I/O
Illuminator color select control input/output
28
AMSON
O
TAPE AMS control output
29
REL
I
Rotation detection input of reel table.
30
MTLIN
I
Auto METAL detection input
31, 32
POS3, 2
I
Position signal detection input
33
GND
—
GND of microcomputer.
34, 35
POS0, 1
I
Position signal detection input
36
LM LOD
O
Loading motor control output (Loading direction)
37
LM EJ
O
Loading motor control output (Eject direction)
38
N ROUT
O
Forward/Reverse detection output
39
MTLON
O
METAL control output
40
CM ON
O
Capstan motor control output
41
TAPON
O
TAPE power control output
42
PW SEL
I
Power select initial setting
43
RC IN1
I
Rotary commander input 1
44
TEST
I
TEST mode setting input
45
EQSEL
I
Equalizer select input
46
BEEP
O
Buzzer control output
47
MUTE
O
System mute control output
48
VOLCE
O
Electric volume serial chip enable output
49
VOLCKO
O
Electric volume serial clock output
50
VOLSO
O
Electric volume serial data output
51
TAPMUT
O
Tape mute control output
52, 53
RE IN0, 1
I
Rotary encoder input 0, 1
– 26 –
– 25 –
SECTION 6
DIAGRAMS
Pin No.
Pin Name
I/O
Pin Description
54
DOLON
I/O
DOLBY control input/output
55
DOLBC
I/O
DOLBY B/C select control input/output
56
AMSIN
I
Music with/without detection input in AMS.
57
DIMMER
I/O
Dimmer control input/output
58
AD ON
O
Power control output for A/D conversion.
59
RAMBU
I
RAM reset detection input
60
RESET
I
Reset input
61
SIRCS
I
Remote commander input
62
BU IN
I
Back-up power detection input
63
DOORSW
I
Door open/close switch
64
ACCIN
I
Accessory power detection input
65
NOSESW
I
Detachable panel detection
66
TELMUT
I
Telephone mute detection input
67
KEYACK
I
Key input acknowledge
68
VDD
—
Power supply for microcomputer.
69
X OUT
O
Main ceramic oscillator output pin (5 MHz)
70
X IN
I
Main ceramic oscillator input pin (5 MHz)
71
GND
—
GND for microcomputer.
72
XT OUT
O
Sub crystal oscillator output pin (32.768 kHz)
73
XT IN
I
Sub crystal oscillator input pin (32.768 kHz)
74
AVDD
—
Power supply for A/D conversion.
75
AVREF
—
Reference power supply for A/D conversion.
76, 77
KEYIN0, 1
I
Key input 0, 1
78
VSM
I
FM/AM common signal meter A/D conversion input
79
DSTSEL
I
Destination initial setting A/D conversion input
80
RC IN0
I
Rotary commander input 0
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