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Model
CMT-E301 HCD-E301
Pages
34
Size
2.03 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-e301-hcd-e301.pdf
Date
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10
HCD-E301
SECTION  4
MECHANICAL  ADJUSTMENTS
SECTION  5
ELECTRICAL  ADJUSTMENTS
Tape Speed Adjustment
Setting:
Function: TAPE
Procedure:
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.
Specified Value: 2,985 to 3,015 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-48A
3 kHz, 0 dB
Tape Speed Adjustment
P-4-A063
6.3 kHz, –10 dB
Head Azimuth Adjustment
frequency counter
test tape 
WS-48A
(3 kHz, 0 dB)
set
HEADPHONE board
PHONES jack (JK401)
–
+
32 
Ω
CAPSTAN/REEL
motor (M201)
Tape Speed
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
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)
11
HCD-E301
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode: Playback (FWD)
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
parts adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
test tape 
P-4-A063
(6.3 kHz, –10 dB)
L-CH
R-CH
HEADPHONE board
PHONES jack (JK401)
oscilloscope
V
H
+ +
–
–
screen pattern
in phase
good
wrong
45 
°
90 
°
135 
°
180 
°
32 
Ω
32 
Ω
set
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback (FWD)
level meter
test tape 
P-4-A063
(6.3 kHz, –10 dB)
set
HEADPHONE board
PHONES jack (JK401)
32 
Ω
+
–
Adjustment Location: Record/Playback/Erase Head.
Note: Refer to “3-7. CASSETTE LID” (see page 9)
12
HCD-E301
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
L104 FM Frequency
Coverage Adjustment
T102
AM Frequency Coverage Adjustment
TC102 
}
AM Tracking
L110
Adjustment
L103
FM Tracking
TC101 
}
Adjustment
– MAIN BOARD (Conductor Side) –
TP10
(FM VT)
TP11
(AM VT)
IC101
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
TUNER  SECTION
0 dB=1 
µ
V
[AM]
Setting:
Function
: TUNER
Band switch : AM
[FM]
Setting:
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.
AM RF signal 
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to 
the set.
+
–
level meter
set
32 
Ω
HEADPHONE board
PHONES jack (JK401)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
set
32 
Ω
0.01 
µ
F
MAIN board
FM ANT
HEADPHONE board
PHONES jack (JK401)
digital voltmeter
100 k
Ω
MAIN board
TP10 (FM VT)
TP11 (AM VT)
HCD-E301
13
13
SECTION  6
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
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.)
•
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.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: TAPE PLAY
a
: RECORD
J
: CD PLAY
6-1.
NOTE  FOR  PRINTED  WIRING  BOARDS  AND  SCHEMATIC  DIAGRAMS
• Circuit Boards Location
MAIN 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.
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