Sony CMT-EP305 / HCD-EP305 Service Manual ▷ View online
13
HCD-EP305
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function
Function
: TUNER
Band switch : AM
[FM]
Setting:
Function
Function
: 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.
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
HEADPHONE board
PHONES jack (JK401)
PHONES jack (JK401)
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
FM ANT
FM ANT
HEADPHONE board
PHONES jack (JK401)
PHONES jack (JK401)
digital voltmeter
100 k
Ω
MAIN board
TP10 (FM VT)
TP11 (AM VT)
TP11 (AM VT)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
531 kHz
1.5
± 0.2 V
T102
1,602 kHz
7.3
± 0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L110
603 kHz
TC102
1,404 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L104
87.6 MHz
2.1
± 0.2 V
Confirmation
108 MHz
7.0
± 0.4 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L103
89.9 MHz
TC101
105.9 MHz
Adjustment Location: MAIN board (See page 14)
14
HCD-EP305
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
L104 FM Frequency
Coverage Adjustment
Coverage Adjustment
T102
AM Frequency Coverage Adjustment
AM Tracking
{
L110
Adjustment
TC102
FM Tracking TC101
Adjustment
Adjustment
{
L103
– MAIN BOARD (Conductor Side) –
TP10
(FM VT)
TP11
(AM VT)
IC101
15
15
HCD-EP305
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. p: pF.
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
2
: nonflammable resistor.
•
C
: panel designation.
Note on Printed Wiring Board:
•
W
: indicates side identified with part number.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
• Indication of transistor
•
A
: B+ Line.
•
H
: adjustment for repair.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
<
tion tolerances.
no mark : FM
<
> : CD (STOP)
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB (TAPE)
a
: REC (TAPE)
J
: CD PLAY
• Waveforms
– MAIN Board –
– CASSETTE Board –
– DISPLAY Board –
1
IC102
ws
(XOUT)
3.4 Vp-p
139 ns
1 V/DIV, 40 ns/DIV
2
Q705 (Collector)
(RECORD mode)
2 V/DIV, 4
µ
s/DIV
3
IC601
tl
(X2)
1 V/DIV, 100 ns/DIV
6.0 Vp-p
12.4
µ
s
5.2 Vp-p
167 ns
B
These are omitted.
C
E
SECTION 6
DIAGRAMS
6-1. Circuit Boards Location
MAIN board
LED board
HEADPHONE board
CASSETTE board
DISPLAY board
POWER board
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
16
16
HCD-EP305
6-2. Block Diagrams
Tuner/Tape Deck Section
: FM
: AM
• Signal Path
• R-CH is omitted due to same as L-CH.
: PB(TAPE)
: REC(TAPE)
9
13
12
11
1
3
10
5
15
7
7
16
18
19
20
15
8
11
12
6
4
5
3
7
2
4
3
1
22
Q101
FM OSC
BUFFER
BUFFER
Q102
BAND
SWITCH
Q703
MUTING
CONTROL
SWITCH
Q704
MUTING
CONTROL
SWITCH
Q702
MUTING
Q104
AMP
Q601
BUFFER
BPF
ANT1
AMRF
IN
AM
OSC
24 FMRF
IN
22
FMRF
OUT
FM
OSC
20
QUAD
AM
OSC BUFFER
FM
ANT
L110
AM ANT
D105
T102
AM OSC
L103
FM RF
D103
D104
L104
FM OSC
F101
10.7MHz
T103
X101
10.7MHz
PD
LRFIN
LPFOUT
FMIN
AMIN
BO1
IO1
IFIN
DO
DI
CL
CE
IC102
FM/AM PLL
X102
7.2MHz
XIN
XOUT
AM MIX
FM MIX
FM DET
SD
AM/FM
IF
BUFFER
AM IF
16
17
L
R
IC101
AM/FM IF AMP,
MIX, MPX, DET, OSC
REC
BIAS
OSC
Q706
SW701
(3/6)
REC
PB
R-CH
L
R
T701
REC BIAS
ERASE HEAD
REC/PB HEAD
AMP
ALC CONT
ALC IN1
IN1
OUT1
M
41 36 37 47 38
60
(CAPSTAN/REEL)
STEREO
45
SYNCRO
TUNER SD
ST
PLLDI
PLLCE
PLLCL
PLLDI
PLLCE
PLLCL
STOUT
SIG
SIG
ST
PLLDI
PLLCE
PLLCL
STOUT
AMP SECTION
B
AMP SECTION
C
AMP SECTION
D
DISPLAY SECTION
E
AMP SECTION
A
IC701
ALC REC/PB AMP
IC601 (1/3)
SYSTEM CONTROLLER
R-CH
TUNER
L-CH
PL
RL
DC_12V
(MAGNET)
COTR
S201
(PLAY)
+
TC102
TC101
FM FREQUENCY
COVERAGE
AM FREQUENCY
COVERAGE
AM TRACKING
FM TRACKING
F102
PLLDO SELECT
M201
SW701
(4/6)
PB
REC
SW701
(6/6)
PB
REC
SW701
(5/6)
REC
PB
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