Sony SRF-M85 Service Manual ▷ View online
3
SRF-M85
SECTION 1
GENERAL
This section is extracted from
instruction manual.
instruction manual.
RADIO ON
MB
STPW PITCH
SPLIT TIMER
SPLIT TIMER
FM
AM
PM
PM
HOLD lever
BAND
SPLIT/RESET
START/STOP
POWER
ENTER
FM SENS
DX/LOCAL
DX/LOCAL
Belt clip
DISPLAY
TUNE/TIME SET +/
−*
1
VOL*
2
MODE
MEGA BASS
i (headphones/
earphones) jack
earphones) jack
*
2
There is a tactile dot beside VOL to show the direction to turn up
the volume.
*
1
The TUNE/TIME SET + has a tactile dot.
Features
¥ FM/AM 2 band PLL (phase locked loop) synthesized armband radio.
¥ A total of 20 stations can be preset, 15 FM stations and 5 AM stations.
¥ Stopwatch, split and pitch timer functions.
¥ Wearable round design for armband and belt-holder use.
¥ Splash-resistant for all —weather use.
¥ MEGA BASS for dynamic bass sound.
¥ A total of 20 stations can be preset, 15 FM stations and 5 AM stations.
¥ Stopwatch, split and pitch timer functions.
¥ Wearable round design for armband and belt-holder use.
¥ Splash-resistant for all —weather use.
¥ MEGA BASS for dynamic bass sound.
Setting the Clock
The display will flash AM 12:00 when the battery is first inserted.
1
Press DISPLAY repeatedly to select the clock mode when the
clock mode is not on.
clock mode is not on.
2
Hold down ENTER for more than 2 seconds.
The beep sounds and the hour flashes in the display.
3
Press TUNE/TIME SET + or – until the correct hour appears in
the display.
the display.
Each press changes the digit(s) by one.
When you keep the button pressed, the digit(s) change rapidly.
When you keep the button pressed, the digit(s) change rapidly.
4
Press ENTER.
The beep sounds and the minute starts to flash.
Repeat step 3 to set the minute. After setting the minute,
press ENTER again. The two beeps sound and the clock
starts from 0 seconds.
Repeat step 3 to set the minute. After setting the minute,
press ENTER again. The two beeps sound and the clock
starts from 0 seconds.
Notes
¥ One you start setting the clock, you must perform each step within 65 seconds,
¥ One you start setting the clock, you must perform each step within 65 seconds,
or the clock setting mode will be canceled.
¥ 12-hour system: AM 12:00 = midnight, PM 12:00 = noon.
SRF-M85
4
Note:
Follow the disassembly procedure in the numerical order given.
2-2. CABINET (FRONT) ASSY
•
This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SECTION 2
DISASSEMBLY
5
three screws
(1.7
(1.7
×
8)
4
clip assy
3
two screws
(1.7
(1.7
×
6)
2
two screws
(1.7
(1.7
×
6)
2
1
3
5
4
1
S311
lever
Note: When installing the cabinet (front) assy,
install five screws in order of figure.
Note: When installing the cabinet (front) assy, adjust S311 and lever.
1
,
2
,
3
: 0.09
±
0.01 N
•
m
4
,
5
: 0.08
±
0.01 N
•
m
6
cabinet (front) assy
SET
2-2. Cabinet (Front) Assy
(Page 4)
2-3. Board Assy
(Page 5)
2-4. Spreading of Adhesive Agent
(Page 5)
SRF-M85
5
2-3. BOARD ASSY
2
Remove two solders.
black
KEY board
1
stopper cushion
red
4
3
claw
7
board assy
MAIN board
6
screw (1.7
×
6)
S101
5
knob (VOL) assy
lever
KEY board
Note: When installing the board assy, adjust S101 and lever.
2-4. SPREADING OF ADHESIVE AGENT
slit
cabinet (rear) assy
adhesive agent
(OK)
(NG)
Note: When installing the cabinet (front) assy,
spread the adhesive agent (TSE3975C 100G)
(Part No.: 7-600-006-17) in the slit.
(Part No.: 7-600-006-17) in the slit.
6
SRF-M85
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB=1 mV
[AM]
Setting:
BAND button: AM
BAND button: AM
[FM]
Setting:
BAND button: FM
BAND button: FM
•
Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
16
Ω
i
jack (J201)
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
–
level meter
0.01
µ
F
MAIN board
TP (RF GND)
TP (RF GND)
MAIN board
TP (ANT IN)
TP (ANT IN)
set
16
Ω
i
jack (J201)
digital voltmeter
TP (VT)
TP (RF GND)
MAIN board
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L104
531 kHz
1.3
±
0.05 V
Confirmation
1,710 kHz
7.7
±
0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L103
585 kHz
CT101
1,485 kHz
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
108 MHz
8.7
±
0.5 V
Confirmation
87.5 MHz
5.8
±
0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L102
87.5 MHz
Adjustment and Connecting Location: MAIN board
(See page 7)