DOWNLOAD Sony CMT-EP30 / CMT-EP40 / HCD-EP30 / HCD-EP40 Service Manual ↓ Size: 2.1 MB | Pages: 36 in PDF or view online for FREE

Model
CMT-EP30 CMT-EP40 HCD-EP30 HCD-EP40
Pages
36
Size
2.1 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cmt-ep30-cmt-ep40-hcd-ep30-hcd-ep40.pdf
Date
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Sony CMT-EP30 / CMT-EP40 / HCD-EP30 / HCD-EP40 Service Manual ▷ View online

HCD-EP30/EP40
9
3-4.
CD  CABINET  SECTION
3-5.
CD  MECHANISM  DECK (CS-21SC-1280)
1
two screws
(BTP2.6 
×
 8)
2
CD cabinet section
1
two screws
(BVTP3 
×
 10)
2
plastic cover
7
vibration proof rubber
(pink)
7
vibration proof rubber
(pink)
4
four fiber washers
3
four pulley screws
7
vibration proof rubber
(brown)
7
vibration proof rubber
(brown)
8
CD mechanism deck (CS-21SC-1280)
5
6
two spring clamps
6
two spring clamps
HCD-EP30/EP40
10
3-6.
TAPE  MECHANISM  DECK (TCM125-2)
3-7.
CASSETTE  LID
4
cassette board
3
1
connector
(CN701)
2
two screws
(BTP2.6 
×
 6)
6
two screws
(BVTP3 
×
 10)
6
two screws
(BVTP3 
×
 10)
7
tape mechanism deck
(TCM125-2)
5
Open the cassette lid.
1
Open the cassette lid.
3
cassette lid
2
claw
2
claw
11
HCD-EP30/EP40
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)
12
HCD-EP30/EP40
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 10)
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