Sony CMT-EP505 / HCD-EP505 Service Manual ▷ View online
HCD-EP505
10
3-6.
TAPE MECHANISM DECK (CRL3439)
3-7.
CASSETTE LID
1
two screws
(BVTP3
(BVTP3
×
10)
1
two screws
(BVTP3
(BVTP3
×
10)
2
tape mechanism deck
(CRL3439)
(CRL3439)
1
Open the cassette lid.
3
cassette lid
2
claw
2
claw
11
HCD-EP505
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
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
MAIN board
SPEAKER terminal (CN503)
SPEAKER terminal (CN503)
–
+
47 k
Ω
CAPSTAN/REEL
motor
motor
Tape Speed
Adjustment
Adjustment
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
• Tape Tension Measurement
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
• Torque Measurement
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN•m
FWD
CQ-102C
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
FWD
CQ-102C
(1.5 – 5.5 g•cm)
Back Tension
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)
(WS-48B)
12
HCD-EP505
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.
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
MAIN board
SPEAKER terminal (CN503)
SPEAKER terminal (CN503)
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
SPEAKER terminal (CN503)
SPEAKER terminal (CN503)
digital voltmeter
100 k
Ω
MAIN board
TP (FM VT)
TP (AM VT)
TP (AM VT)
Ver 1.1
no mark : EXCEPT AEP, UK, Chinese models
< > : AEP, UK, Chinese models
< > : AEP, UK, Chinese models
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T401 <T406>
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L408
530 kHz
1.3
± 0.1 V
<T402>
<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
L407 <T401>
603 kHz
TC402 <TC401>
1,404 kHz
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
87.5 MHz
2.4
± 0.1 V <1.4 to 1.6 V>
Confirmation
108 MHz
6.8
± 0.5 V <7.3 to 8.5 V>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
TC401
106.1 MHz
(EXCEPT AEP, UK, Chinese models)
Adjustment Location: MAIN board (See page 14)
13
HCD-EP505
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
T402
AM Frequency
Coverage Adjustment
T406
AM IF Adjustment
AM Tracking Adjustment
{
TC401
T401
T401
– MAIN BOARD (Conductor Side) –
TP
(FM VT)
TP
(AM VT)
TP
(FM ANT)
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