DOWNLOAD Sony CFS-1085S Service Manual ↓ Size: 1.51 MB | Pages: 30 in PDF or view online for FREE

Model
CFS-1085S
Pages
30
Size
1.51 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfs-1085s.pdf
Date

Sony CFS-1085S Service Manual ▷ View online

8
CFS-1085S
3-2. ELECTRICAL ADJUSTMENTS
 TAPE  SECTION
Switch location
   FUNCTION switch................. TAPE (RADIO OFF)
   SOUND SELECT.................... FLAT
   VOLUME................................. mechanical center
   MEGA BASS............................ OFF
Test Tape
Type
Signal
Used for
WS-48B
3kHz, 0dB
Tape Speed Adjustment
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power sup-
ply voltage (9V) unless otherwise noted.
1.Torque Measurement
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN•m
Playback
CQ-102C
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 0.53 mN•m
Back Tension
CQ-102C
(1.5 – 5.5 g•cm)
(0.021 – 0.076 oz•inch)
5.4 – 13.2 mN•m
Rewind
CQ-201B
(55 – 135 g•cm)
Fast Forward
(0.77 – 1.87 oz•inch)
2. Tape Tension  Measurement
Mode
Torque Meter
Meter Reading
FWD
CQ-403A
more than 100g (3.53 oz)
SECTION 3
ADJUSTMENTS
 0dB = 0.775 V
9
CFS-1085S
Tape Speed Adjustment
Procedure :
    Mode : playback
Adjustment Values :
      Digital frequencycounter
               2,910 to 3,090Hz
Frequency difference between the begining and the end of the
tape should be within 1% (30Hz)
Adjustment Values :
tape speed adjustment
control inside motor
set
test tape
WS-48B
(3kHz, 0dB)
32
digital frequency
counter
phones jack
10
CFS-1085S
 TUNER  SECTION
 MW Section
Procedure :
BAND Switch
: MIN
FINE TUNE control
: mechanical center
 SW Section
Procedure :
BAND Switch
: SW1, SW2
FINE TUNE control
: mechanical center
 FM Section
Procedure :
BAND Switch
: FM
FINE TUNE control
: mechanical center
(
) : Saudi Arabia model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CT4
1,680kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CT3
1,400kHz
SW1 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
2.2MHz
CT6
7.3MHz
SW1 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
2.2MHz
Confirmation
7.3MHz
SW2 FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L8
6.8MHz
CT8
22.5MHz
SW2 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
6.8MHz
Confirmation
22.5MHz
FM FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5MHz (87.35MHz)
CT2
109.5MHz (107.8MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz (87.35MHz)
CT1
109.5MHz (107.8MHz)
AM RF signal
generator
30% amplitude modulation by
 400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
12PF
Adjustment Location : Mechanism deck
Switch location
   FUNCTION switch................ TAPE (RADIO OFF)
   SOUND SELECT.................. FLAT
   VOLUME.............................. mechanical center
   MEGA BASS......................... OFF
TUNER SECTION
AM  RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to 
the set.
set
32
J301 (phones)
level meter
FM RF signal
generator
22.5kHz frequency deviation by 
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
0.01
µ
F
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
11
CFS-1085S
FM VCO Adjustment
Procedure :
1. Connect the frequency counter to 4 and 7 pins of IC1 as
shown the figure.
2. Turn the set to 98MHz.
3. Adjustment RV1 for 76kHz 
±
 500Hz reading on frequency
counter.
Adjustment Location :
telescopic
antenna
terminal
FM RF signal
generator
Carrier frequency  : 98MHz
Modulation  : no modulation
Output level  : 0.032V (90dB)
0.01
µ
F
set
C14
C15
C000
C000
C18
C20
C19
C5
R7
R8
R24
R11
R9
R16
R6
R4
R5
C4
C16
C17
C31
CF1
C9
C13
VR1
FINE
L2
B
C
E
Q2
IC1
TUNER BOARD  
(Conductor side)
A
CN304
1
6
1
4
7
15
16
30
CF3
frequency
counter
1
µ
F
+
33k
CT2 : FM Frequency Coverage Adjustment
L2 : FM Frequency Coverage Adjustment
CT4 : MW Frequency Coverage Adjustment
T1 : AM IF Adjustment
L3 : MW Tracking Adjustment
CT3 : MW Tracking Adjustment
CT1 : FM Tracking Adjustment
L1 : FM Tracking Adjustment
L4 : MW Frequency Coverage Adjustment
L8 : SW2 Frequency Coverage Adjustment
CT8 : SW2 Frequency Coverage Adjustment
CT6 : SW1 Frequency Coverage Adjustment
L6 : SW1 Frequency Coverage Adjustment
RV1: FM  VCO Adjustment
L7 : SW2 Tracking Adjustment
L5 : SW1 Tracking Adjustment
(Component side)
TUNER BOARD  
Page of 30
Display

Click on the first or last page to see other CFS-1085S service manuals if exist.