Sony CMT-EP707 / HCD-EP707 Service Manual ▷ View online
HCD-EP707
13
3-12. BELT (GRAY/BLACK)
1
belt (gray)
2
belt (black)
7
flexible cable
8
two cushions
qa
optical block
9
two cushions
0
cushion
1
two screws
2
arm
3
carriage
6
5
four washers
4
four screws
3-13. OPTICAL BLOCK
HCD-EP707
14
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function: TUNER
TUNER/BAND switch: AM
Function: TUNER
TUNER/BAND switch: AM
[FM]
Setting:
Function: TUNER
TUNER/BAND switch: FM
Function: TUNER
TUNER/BAND switch: FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer 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
32
Ω
SPEAKER JACK board
SPEAKER terminal (SP801)
SPEAKER terminal (SP801)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
set
32
Ω
0.01
µ
F
MAIN board
TP (FM ANT)
TP (FM ANT)
MAIN board
TP (GND)
TP (GND)
SPEAKER JACK board
SPEAKER terminal (SP801)
SPEAKER terminal (SP801)
digital voltmeter
100 k
Ω
MAIN board
TP (VT)
TP (GND)
SECTION 4
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Setting:
Function: TAPE
Function: TAPE
Procedure:
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor so that the fre-
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor so that the fre-
quency counter reading becomes 3,000 Hz.
Specified Value: 2,910 to 3,090 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
PRECAUTION
1. Setting
MEGA BASS switch : OFF
TAPE DECK SECTION
0 dB=0.775 V
Test tape
Type
Signal
Used for
WS-48B
3 kHz, 0 dB
Tape Speed Adjustment
frequency counter
test tape
WS-48B
(3 kHz, 0 dB)
WS-48B
(3 kHz, 0 dB)
set
SPEAKER JACK board
SPEAKER terminal (SP801)
SPEAKER terminal (SP801)
–
+
47 k
Ω
CAPSTAN/REEL
motor
motor
Tape Speed
Adjustment
Adjustment
Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)
(WS-48B)
15
15
HCD-EP707
( ): AEP, UK models
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
IFT205
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
IFT201
530 kHz
1.3
± 0.1 V
(531 kHz)
Confirmation
1,710 kHz
7.8
± 0.5 V
(1,602 kHz)
(7.1
± 0.5 V)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
IFT202
603 kHz
VC205
1,404 kHz
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L204
87.5 MHz
2.3 to 2.5 V (1.4 to 1.6 V)
Confirmation
108 MHz
6.3 to 7.3 V (7.3 to 8.5 V)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L203
90.1 MHz
VC202
106.1 MHz
TP
(FM ANT)
TP
(GND)
TP
(VT)
– MAIN BOARD (Conductor Side) –
– MAIN BOARD (Component Side) –
IFT205 AM IF Adjustment
L204 FM Frequency Coverage Adjustment
IFT201 AM Frequency Coverage Adjustment
L203
}
FM Tracking Adjustment
VC202
IFT202
}
AM Tracking Adjustment
VC205
Adjustment Location and Connecting Points
16
16
HCD-EP707
SECTION 5
DIAGRAMS
5-1.
BLOCK DIAGRAM – TUNER Section –
• SIGNAL PATH
: FM
: AM
• R-ch is omitted due
to same as L-ch.
to same as L-ch.
CON202
CON201
24
5
10
22
16
FMRF IN
FMIF
FMRF OUT
13
FM DET
19
DET OUT
1
AMRF IN
3
AM
OSC
OSC
8
AMOSC
BUFFER
20
FMOSC
15
AM/FM SW
7
AM/FMIF
BUFFER
FM
MIX
L OUT
R OUT
17
3
CE
DO
6
4
DI
20
XOUT
1
XIN
CL
5
CF201
9
11
AMIF
7
BO1
12
IFIN
11
IO1
20
AOUT
19
AIN
18
PD
FMIN
AM
MIX
CF202
CF203
B
(Page 18)
A
(Page 18)
FM ANT
75Ω
COAXIAL
AM ANT
BPF
BPF201
IFT202
AM RF
AM RF
IFT201
AM OSC
Q201
VC205
AM FREQUENCY
COVERAGE
IFT201
FM FREQUENCY
COVERAGE
L204
AM TRACKING
IFT202, VC205
FM TRACKING
L203, VC202
VC202
L203
FM RF
FM/AM IF AMP,
MIX, DET, MPX, OSC
IC202
AM IF
IFT205
TU-L
R-CH
TU-R
DA IN
CLOCK
PLL CE
DA OUT
AGC
12
16
AMIN
15
BUFFER
Q202
STATION
STEREO
14
MONO/ST
8
BO2
FM/AM
SELECT SWITCH
Q204
FM OSC BUFFER
Q252
L. P. F
CF204
7.2MHz
FM/AM PLL
IC201
RCLK
RDATA
RCLK
RDAT
MUX
BUFFER
Q208
4
16
2
CF205
4.332MHz
RDS DECODER
IC203
14
13
XI
XO
H
(Page 19)
(AEP, UK)
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