Sony SRF-M85 Service Manual ▷ View online
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)
SRF-M85
7
7
SRF-M85
Adjustment and Connecting Location:
AM Tracking Adjustment
CT101
L103
L103
L102
FM Tracking Adjustment
L104
AM VCO voltage Adjustment
TP
(VT)
TP
(ANT IN)
TP
(RF GND)
– MAIN Board (Conductor Side) –
– MAIN Board (Component Side) –
