Sony CMT-EP303 / HCD-EP303 Service Manual ▷ View online
13
HCD-EP303
Tape Speed Adjustment
Setting:
Function: TAPE
Function: TAPE
Procedure:
1.
1.
Playback WS-48A (tape center) in the FWD state.
2.
Adjsut the volume in CAPSTAN/REEL motor (M201) so that
the frequency counter reading becomes 3,000 Hz.
the frequency 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.
of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
set
HEADPHONE board
PHONES jack (JK401)
PHONES jack (JK401)
–
+
32
Ω
CAPSTAN/REEL
motor (M201)
motor (M201)
Tape Speed
Adjustment
Adjustment
Adjustment Location: Record/Playback Head.
Note: Refer to “3-8. Cassette Lid” (see page 11)
adjustment screw
14
HCD-EP303
TUNER SECTION
0 dB=1 µV
[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)
no mark : Except AEP, UK models
< > : AEP, UK models
< > : AEP, UK models
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
530 kHz
1.5 ± 0.2 V
<531 kHz>
T102
1,710 kHz
7.7 ± 0.3 V
<1,602 kHz>
<7.3 ± 0.3 V>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L110
600 kHz <603 kHz>
TC102
1,400 kHz <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 15)
15
HCD-EP303
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
16
HCD-EP303
SECTION 6
DIAGRAMS
6-1. Circuit Boards Location
MAIN board
LED board
HEADPHONE board
CASSETTE board
DISPLAY board
POWER board
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