Sony SRF-MQ11 Service Manual ▷ View online
9
SRF-MQ11
2-8. BATTERY BOARD
5
lead wire (11core)
6
BATTERY board
2
connector (CN501)
3
Remove soldering
from the two points.
4
Remove soldering from the eleven points.
1
screw
(B1.4
(B1.4
×
4)
natural (ANT)
yellow (COM)
brack (L-CH)
red (BATT)
purple (CHG)
orange (P-SW)
green (DCIN)
gray (R-CH)
brown (SP+)
blue (MB)
white (GND)
2-9. SPEAKER (L)
1
screw
(B1.4
(B1.4
×
4)
2
two claws
3
ear pad
6
three claws
7
holdr (driver)
8
speaker (L)
5
three claws
4
Remove soldering
from the two points.
red
gray
holdr (driver)
speaker (R)
red
gray
red marking
Install the speaker (R) so that
the both positions are aligned.
the both positions are aligned.
Convexity
10
SRF-MQ11
SECTION 3
ADJUSTMENTS
Setting:
SENS switch: DX
Connection:
SENS switch: DX
Connection:
digital
voltmeter
voltmeter
TP (VT)
level meter
set
headphone jack (
i
)
16
Ω
+
–
–
FM RF signal
generator
generator
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
by 400 Hz signal.
Output level: as low as possible
0.01
µ
F
TP (ANT)
Adjustment Location
FM FREQUENCY COVERAGE CHECK
Check a reading on digital voltmeter.
Confirm
87.5 MHz
2.7V
± 0.5V
Confirm
108.0 MHz
8.2V
± 1.0V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
CT1
108.0 MHz
L1
87.5 MHz
IC1
MAIN BOARD
(SIDE A)
MAIN BOARD
(SIDE B)
IC101
TP(ANT)
TP(VT)
CT1
FM TRACKING
ADJUSTMENT
L1
FM TRACKING
ADJUSTMENT
11
11
SRF-MQ11
SECTION 4
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 1.5 V and fed with regulated dc power
supply from battery terminal or DC in jack (J501).
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : power supply from DC in jack
*
: impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
•
•
Signal path.
F
: FM
• Waveforms
Note on Printed Wiring Board:
• Y
: parts extracted from the conductor side.
•
b
: Pattern from the side which enables seeing.
•
: Carbon pattern.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B)
Pattern face side: Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
1V/DIV , 10
µ
s/DIV
1
IC301
tg
XOUT
1.3 Vp-p
13.3
µ
s ns
12
12
SRF-MQ11
4-1. BLOCK DIAGRAM
C1
C2
CT1
L1
L1, CT1
D1
D2
RV101
IC101
VREF
IN A
IN B
3
1
2
PW MUTE
5
(MUTE)P4-3
(POWER ON1) P2-0
(POWER SW) INT2
(CHARGE) P4-2
31
50
(DC IN) P1-3
Q501 - Q504
SWITCH
Q305, Q306
SWITCH
VDD
Q103
Q102
Q101
IC501
REG
S301
S502
MEGA BASS
ON
OFF
RECHARGABLE
BATTERY
NI-MH
1PC, 1.2V
D504
J501
J502
SPEAKER
R-CH
SPEAKER
L-CH
VOUT
5
VIN 1
DC IN 4.5V
AUDIO IN
S501
MEGA BASS
ON
OFF
OUT C 18
AGC IN 1
16
19
Q3
Q2
S302
D201
VDD
VDD
IC304
LEVEL DET
IC302
LEVEL DET
IC303
RESET
GND
OUT
IN
GND
IN
GND
IN
CF1
CF2
Q201, Q202
T201
VCC
IC1
15
16
P2-1 (VDET 2)
(VDET 1)INT 1
51
(POWER ON2) P3-0
IC301
42
Q304
SWITCH
(ENTER/MODE) P9-2 21
(-) P9-1 20
(+) P9-0 19
MODE/ENTER
29
2
4
8
12
13
11
6
21
28
34
30
26
VOL
LIQUID CRYSTAL DISPLAY
• SIGNAL PATH
: FM
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