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Model
CFD-EX35L
Pages
52
Size
9.52 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfd-ex35l.pdf
Date
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13
CFD-EX35L
4-1. 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
supply voltage (9V) unless otherwise noted.
Torque Measurement
Torque
Torque Meter
Meter Reading
1.77 – 5.88 mN•m
Forward
CQ-102C
(18 – 60 g•cm)
(0.25 – 0.83 oz•inch)
Forward
0.1 – 0.49 mN•m
Back Tension
CQ-102C
(1.0 – 5.0 g•cm)
(0.014 – 0.069 oz•inch)
4.42 – 9.31 mN•m
Fast Forward
CQ-201B
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
4.42 – 9.31 mN•m
Rewind
CQ-201B
(45 – 95 g•cm)
(0.62 – 1.32 oz•inch)
Tape Tension  Measurement
Torque Meter
Meter Reading
CQ-403A
more than 60g
(more than 2.12 oz)
SECTION 4
ADJUSTMENTS
4-2. Electrical Adjustments
 TAPE SECTION
Standard Output Level
Output terminal
HP OUT
load impedance
32 
Ω
output signal level
0.25V (–10dB)
Test Tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment so than the value on the digital frequency counter is
3,000 Hz.
Adjustment Value : 3,000Hz
Standard Value : 2,940 - 3,060Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
set
test tape
WS-48A
(3kHz, 0dB)
32
Ω
digital frequency
counter
J391 
(
 
i
 
)
Tape speed adjustment 
control inside motor
 0dB = 0.775V
Adjustment Location : Mechanism deck
14
CFD-EX35L
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Frequency Display
531 kHz
1,611 kHz
Reading on Digital voltmeter
0.9 ± 0.5 V
5.2 ± 0.6 V
Adjustment Part
 <confirmation>
<confirmation>
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-1
CT3
621 kHz
1,404 kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Frequency Display
153 kHz
279 kHz
Reading on Digital voltmeter
0.6 ± 0.3 V
5.0 ± 0.15 V
Adjustment Part
 L4
<confirmation>
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-2
CT5
162 kHz
261 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.3 ± 0.4 V
3.0 ± 0.3 V
Adjustment Part
<confirmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
Adjustment Location : TUNER board (See page 16)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
 TUNER SECTION
 AM (MW/LW) Section
RADIO BAND : AM (MW or LW)
 FM Section
RADIO BAND : FM
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (FM and AM)
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.
FM RF signal
generator
33.75kHz frequency deviation by 
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
0.01
µ
F
 0dB = 1 
µV
digital
voltmeter
100 k
Ω
TP  CV
J391 
(
 
i
 
)
set
32 
Ω
level meter
(range: 0.5–5 V ac)
15
CFD-EX35L
Focus Bias Check
1.
Connect an oscilloscope between TP  RF  and TP  VREF   on
CD board.
2.
Insert the test disc (YEDS-18).
3.
Set the CD test mode.
4.
Press the  u  button three times (LPC ON).
5.
Confirm that the oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
6.
Press the  u  button.(LPC OFF)
7.
Perform confirmation in step 4 again.
• RF Signal Reference Waveform (eye pattern)
RF level
0.85 
±
 0.2 Vp-p (LPC ON)
0.95 
±
 0.4 Vp-p (LPC OFF)
VOLT/DIV : 200mV
TIME/DIV : 500 ns
 CD SECTION
CD Test  Mode
• How to put the set into CD test mode
1.
Press the  POWER  button to turn the power on.
2.
Insert the test disc (YEDS-18). (Part No. : 3-702-101-01)
(Function is set to CD.)
3.
Set the CD test mode by momentary shorting both sides of
TEST- 1 on MAIN board.
4.
Press the  x  button two times. The set is set to the CD test
mode.
(The message 
80 is displayed.)
• How to release the CD test mode
Turn the power off.
[MAIN BOARD] (Conductor side)
Traverse Waveform Check
1.
Connect an oscilloscope between TP  TE  and TP  VREF  on
CD board.
2.
Set the CD test mode.
3.
Press the  u  botton to play the test disc (YEDS-18).
4.
Confirm that the center of the traverse waveform will be at 0V.
5.
Confirm that the peak-to-peak voltage value of the traverse
waveform meets the specification.
6.
Release the CD test mode.
• Traverse waveform
A (DC voltage)
symmetry
0V
A = 0 
±
 220 mV
B = 0.95 
±
 0.55 Vp-p
B
VOLT/DIV : 200mV
TIME/DIV : 1 ms
IC803
IC802
IC805
IC321
IC801
TEST-1
IC701
 TP  VREF
 TP  TE
 TP  RF
[CD BOARD] (Conductor side)
16
CFD-EX35L
Adjustment Location :
[TUNER BOARD] (Component side)
(Conductor side)
CT1: FM Tracking Adjustment
L1: FM Tracking Adjustment
L3-2: LW Tracking Adjustment
L3-1: MW Tracking Adjustment
CT3: MW Tracking Adjustment
CT5: LW Tracking Adjustment
CNP1
L4: LW Frequency Coverage Adjustment 
T1: AM IF Adjustment 
T2: FM IF Adjustment 
L2: FM Frequency Coverage Adjustment 
IC2
IC1
R12
R7
R18
R9
R16
R43
C93
C25
C40
C70
C72
C73
C48
C45
C46
C6
R64
C5
C71
C44
Q44
Q12
Q43
E
E
Q14
E
E
R42
R22
R17
R19
C3
R66
C64
JC22
C58
C2
E
Q42
E
Q41
E
Q61
R93
JC23
TP  CV
MW/LW/FM Frequency Coverage Adjustment
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