Sony CFD-RG880CP Service Manual ▷ View online
CFD-RG880CP
21
SECTION 6
ELECTRICAL ADJUSTMENTS
CD section adjustments are done automatically in this set.
In case of operation check, confi rm that focus bias.
In case of operation check, confi rm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin 2 and pin qa (or
1. Connect the oscilloscope between IC701 pin 2 and pin qa (or
TP (RF OUT) and TP (VC)).
2. Insert the disc (PATD-012 (Tr 15)). (Part No. : 4-225-203-01)
3. Press the [
3. Press the [
N X
] (CD) button.
4. Confi rm that the oscilloscope waveform is as shown in the fi g-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
RF level :
1.0 ± 0.2 Vp-p
1.0 ± 0.2 Vp-p
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
CD SECTION
Test Point:
FB702
X701
R755
C754
R702
R723 R533
C764
CN701
C701
C708
C709
C716
R724
R724
R780
R511
FB706
CN705
R797
R796
TP743
R794
TP738
TP735
TP734
TP733
TP732
TP731
TP730
TP723
TP724
TP725
TP726
TP727
TP739
TP742
TP741
TP741
TP740
TP736
TP737
C781
C514
R517
C710
R701
C759
C702
C703
R706
R707
R709
R710
R716 R718
C71
1
R722
R717 R719
R721
C704
C715
C712
Q701
C714
1
1
1
1
E B
C
16
4
12
36
25
24
13
37
48
20
60
80
61
21
40
41
IC701
IC702
C726
C725
R728
R514
R776 R775
R774
R772
R779
R778
R777
C786
R534
C785
R781
R782
C788
C789
C787
FB705
C510
R513
IC704
R783 R787
R788
R784
R799
R798
R795
R791
R773
R771
R733 R734
R731
R727
C722
C721
R732
C719
1
3
4
5
TP (RF OUT)
TP (VC)
– CD BOARD (Conductor Side) –
CFD-RG880CP
22
TAPE SECTION
0 dB = 0.775V
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
• Test
Tape
Tape
Signal
Used for
P-4-A063
6.3 kHz, –10 dB
Azimuth Adjustment
WS-48A
3 kHz, 0 dB
Tape Speed Adjustment
Tape Speed Adjustment
Procedure:
Mode: playback
Adjust so that the value on the digital frequency counter is 3,000
Hz.
Procedure:
Mode: playback
Adjust so that the value on the digital frequency counter is 3,000
Hz.
Specifi cation Value:
Digital frequency counter
2,940 to 3,060 Hz
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,970 to 3,030 Hz.
tape winding are between 2,970 to 3,030 Hz.
Jjack (J391)
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
digital frequency
counter
counter
Tape speed adjustment
control inside motor
(M971)
control inside motor
(M971)
Adjustment Location:
CFD-RG880CP
23
TUNER SECTION
0 dB = 1
μV
• AM Section
Setting:
RADIO BAND•AUTO PRESET button: AM
Setting:
RADIO BAND•AUTO PRESET button: AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
Put the loop
antenna close to
the set.
+
–
level meter
set
32
Ω
J jack (J391)
• FM Section
Setting:
RADIO BAND•AUTO PRESET button: FM
Setting:
RADIO BAND•AUTO PRESET button: FM
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
level meter
set
32
Ω
0.01
μF
TUNER board
TP (GND)
TUNER board
TP-ANT(JW2)
J jack (J391)
digital voltmeter
TP (CV)
TP (GND)
100 k
Ω
TUNER board
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be fi nally done by the trimmer
capacitors.
capacitors.
• Remove FM antenna in FM adjustment.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT (EXCEPT MX)
Frequency Display
531 kHz
1,611 kHz
Reading on Digital voltmeter
1.0 ± 0.05 V
4.8 ± 0.6 V
Adjustment Part
L4
<confi rmation>
AM FREQUENCY COVERAGE ADJUSTMENT (MX)
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.0 ± 0.05 V
5.2 ± 0.7 V
Adjustment Part
L4
<confi rmation>
AM TRACKING ADJUSTMENT (EXCEPT MX)
Adjust for a maximum reading on level meter.
L3
CT3
621 kHz
1,404 kHz
AM TRACKING ADJUSTMENT (MX)
Adjust for a maximum reading on level meter.
L3
CT3
620 kHz
1,400 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 ± 0.3 V
3.0 ± 0.2 V
Adjustment Part
<confi rmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
• Abbreviation
MX
MX
: Mexican model
Adjustment Location: See page 24.
CFD-RG880CP
24
Adjustment Location:
L3,CT3
AM TRACKING ADJUSTMENT
L1,CT1
FM TRACKNG
ADJUSTMENT
L2
FM FREQUENCY
COVERAGE
ADJUSTMENT
L4
AM FREQUENCY COVERAGE
ADJUSTMENT
TP-ANT
(JW2)
L3
IC1
CT3
CT1
L4
L2
T2
T1
L1
– TUNER BOARD (Component Side) –
TP
(GND)
TP
(CV)
TP-ANT
JW2
– TUNER BOARD (Conductor Side) –
T1
AM IF
ADJUSTMENT
T2
FM IF
ADJUSTMENT
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