SRF-M35 (serv.man2) - Sony Audio Service Manual (repair manual)

srf-m35 (serv.man2) service manual
Model
SRF-M35 (serv.man2)
Pages
15
Size
1.86 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
srf-m35-sm2.pdf
Date

Read Sony SRF-M35 (serv.man2) Service Manual online

SRF-M35
AEP Model
E Model
SERVICE MANUAL
FM STEREO/AM PLL SYNTHESIZED RADIO
SPECIFICATIONS
Ver 1.0  2000. 06
— 2 —
SECTION 1
GENERAL
This section is extracted
from instruction manual.
1.
Check the area of your repair for unsoldered or poorly-soldered
connections.  Check the entire board surface for solder splashes
and bridges.
2.
Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3.
Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair.  Point
them out to the customer and recommend their replacement.
4.
Look for parts which, through functioning, show obvious signs
of deterioration.  Point them out to the customer and
recommend their replacement.
5.
Check the B+ voltage to see it is at the values specified.
6.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
— 3 —
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
2-1.
FRONT CABINET
2-2.
MAIN BOARD AND KEY BOARD
5
 Cabinet (front) assy
3
 Tow claws
4
 Tow claws
1
 Lid battery case
2
 Two screws (P2
 
×
 8)
1
 Tow claws
2
 Key board
2
 Main board 
— 4 —
SECTION  3
ELECTRICAL  ADJUSTMENTS
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
TI
450 kHz
AM FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
  L5
531 kHz
2.7V 
±
 0.1V
  Confirm
1,602 kHz
8.9V 
±
 1V
AM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
621 kHZ
CT1
1,395 kHz
FM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
87.5 MHZ
CT2
108.0 MHz
Setting:
BAND switch: AM
Setting:
BAND switch:
AM
FM SENS switch: DX
AM Section
AM RF signal 
generator
30% amplitude modulation by 
400 Hz signal.
Output level: as low as possible
Put the lead-wire
antenna close to 
the set.
FM Section
FM RF signal
generator
22.5 kHz frequency deviation 
by 400 Hz signal.
Output level: as low as possible
0.01 
µ
F
TP (ANT)
• Repeat the procedures in each adjustment several times, and the frequency
coverage and tracking adjustments should be finally done by the trimmer
capacitors.
FM VCO Voltage Check
Setting:
BAND switch:
FM
FM SENS switch: DX
Procedure:
1.
Tuen the set to 108.0 MHz.
2.
Confirm that the digital voltmeter reading 8.9 
± 
1 V.
3.
Tuen the set to 87.5 MHz.
4.
Confirm that the digital voltmeter reading is 2.7 V 
±
 0.1 V.
Connection:
For AM frequency coverage adjustment and FM VCO voltage check.
level meter
set
headphone jack (
i
)
16 
+
digital
voltmeter
TP (LPF)
FM STEREO (76 kHz) Adjustment
Setting:
BAND switch:
FM
FM SENS switch: DX
Procedure:
FM RF signal
generator
Carrier frequency: 98 MHz 
Modulation: 1 kHz, 22.5 kHz deviation
Output level: 562 
µ
V (55 dB)
0.01 
µ
F
TP (ANT)
Page of 15

Download Sony SRF-M35 (serv.man2) Service Manual (Repair Manual)

Here you can read online and download Sony SRF-M35 (serv.man2) Service Manual in PDF. SRF-M35 (serv.man2) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony SRF-M35 (serv.man2) Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.