CMT-L7HD, HCD-L7HD - Sony Audio Service Manual (repair manual)

US Model

Canadian Model

AEP Model

UK Model

2003L16-1

© 2003.12

This set is the tuner, CD, HD and amplifier
section in CMT-L7HD.

Model Name Using Similar Mechanism

NEW

CD Mechanism Type

CDM71B

Base Unit Type

BU-31BD63

CD

SECTION

— Continued on next page —

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

With 4-ohm loads, both channels driven, from
120 - 10,000 Hz; rated 25 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

Continuous RMS power output (reference):

25 + 25 W
(4 ohms at 1 kHz, 10%
THD)

DIN power output (rated): 20 + 20 W

(4 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

25 + 25 W
(4 ohms at 1 kHz, 10%
THD)

Music power output (reference):

25 + 25 W

The following measured at 220 V AC, 60 Hz
DIN power output (rated): 20 + 20 W

(4 ohms at 1 kHz, DIN,
110 V - 240 V AC)

Continuous RMS power output (reference):

25 + 25 W
(4 ohms at 1 kHz, 10%
THD, 110 V - 240 V AC)

Inputs
MD/TAPE IN (stereo minijack):

Sensitivity 450 mV (MD)/
250 mV (Tape),
impedance 47 kilohms

DIGITAL OPTICAL IN (Supported sampling
frequencies: 32 kHz, 44.1 kHz and 48 kHz)

Outputs
MD/TAPE OUT (stereo minijack):

Sensitivity 250 mV,
impedance 1 kilohmes

PHONES (stereo minijack):

Accepts headphones with
an impedance of  8 ohms
or more

DIGITAL CD OPTICAL OUT (Supported sampling
frequency: 44.1 kHz)

System

Compact disc and digital
audio system

Laser

Semiconductor laser
(

λ = 795 nm)

Emission
duration: continuous

Frequency response

2 Hz – 20 kHz

Capacity

20 GB

Recording system

ATRAC 3

Transfer rate

132 kbps

Maximum recording time About 300 h
Maximum number of albums
Library area:

250

Flexible area:

250

Maximum number of tracks

20,000

Maximum number of tracks per album

400

Maximum CD-HD ripping speed

Max.

×2

FM stereo, FM/AM superheterodyne tuner

Tuning range
North American model:

87.5 - 108.0 MHz
(100-kHz step)

Other models:

87.5 - 108.0 MHz
(50-kHz step)

Antenna

FM wire antenna

Antenna terminals

75 ohm unbalanced

Intermediate frequency

10.7 MHz

Tuning range
North American model:

530 - 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 - 1,710 kHz
(with the tuning interval
set at 9 kHz)

European model:

531 - 1,602 kHz
(with the tuning interval
set at 9 kHz)

Other models:

530 - 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 - 1,602 kHz
(with the tuning interval
set at 9 kHz)

Antenna

AM loop antenna, external
antenna terminal

Intermediate frequency

450 kHz

2

Power requirements
North American model:

120 V AC, 60 Hz

European  model:

230 V AC, 50/60 Hz

Other models:

110 - 240 V AC ,
50/60 Hz

Power consumption
European model:

See the nameplate
0.2 W (at the Power
Saving Mode)

Other models:

See the nameplate

Dimensions (w/h/d)

Approx. 293 

× 246 ×

131 mm incl. projecting
parts and controls

Mass

Approx. 4.3 kg

Design and specifications are subject to change
without notice.

One of the following messages may appear or
flash in the display during operations.

CD editing (Disc Memo) finished normally.

There are already 100 disc titles stored in the
system.

The system is being initialized.  You cannot load a
CD during this time.  Wait until “Initialize”
disappears from the display.

There is no disc in the CD player.

You have reached the end of the CD while
pressing and holding down M during playing
pause.

You pressed PLAY MODE on the remote during
playback.

You pressed STORAGE MODE during playback.

You pressed STORAGE MODE during manual
recording of a CD.

You tried to program 26 tracks (steps) or more.

You tried to perform High-Speed Synchro Storage
for a CD that has already been completely
recorded.

The system is pausing the recording because
silence continued for 30 seconds or more during
digital recording.

There is no track on the HD.

3

Consult your Sony dealer or local authorized Sony
service facility.

Recording tracks is not possible because there is
not enough recordable space on the HD or the
maximum number of recordable tracks has been
reached.

The system is erasing data from the HD.  Do not
disconnect the power cord.

Consult your Sony dealer or local authorized Sony
service facility.

You tried to make an impossible editing or
recording operation.

The system is recording data to the HD.

The naming capacity of the HD has reached its
limit (about 127 characters).

The album or track has not been labelled.

The system has detected a silent portion during
recording.

No matches were found for Keyword Search.

You tried to perform High-Speed Synchro Storage
while the system was collating data between the
CD and the HD.

You tried to perform High-Speed Synchro Storage
while the system was preparing for Auto Storage
and High-Speed Synchro Storage.

You pressed PLAY MODE on the remote during
playback.

You pressed SEARCH on the remote during
playback.

Proper recording is not possible.

The HD is playing the specified dividing point for
confirmation during the Divide function.

The HD is playing the specified Highlight position
for confirmation during the Highlight Play
function.

The system is being connected to your computer.*

The system is retrying reading data from the CD
during High-Speed Synchro Storage.

The signal was input again after silence continued
for 3 or more but less than 30 seconds during
digital recording.

You tried to turn off the system while the system
was storing data to the HD.

The system is reading data from the HD.

You have reached the end of the track while
adjusting the dividing point during the Divide
function.

Recording tracks is not possible because there are
400 tracks in the album.  Select another album for
recording.

The stopping time is the same as the starting time
in the Daily Timer operation.

The Daily Timer or timer-recording setting that
you attempted to make partially or wholly
coincides with another setting.

* If “REMOTE” appears under other circumstances,

turn off the system, then turn on it again.

You tried to play a CD with a format that the
system does not support, such as a CD-ROM.  The
sound source is a copy of commercially available
music software.

You tried to edit in Shuffle Play, or you tried to
register a track to a playlist that already contains
400 tracks.

The system cannot play the track because of
damage to the audio data.

You tried to record to the HD with HD selected as
the sound source.

You tried to perform manual recording from the
CD with “AUTO” selected as the storage mode.

You pressed REC with “AUTO” selected as the
storage mode.

You tried to record a CD to the HD without
loading the CD.

You tried to record to the HD with less than 131
recordable tracks remaining on the HD.

You tried to record to the HD with less than 240
minutes of recordable time remaining on the HD.

You tried to perform High-Speed Synchro Storage
with no blank album in the Library area.

A moment’s lighting is due to the signals of the
digital program being recorded.  This does not
affect the recorded material.

While recording from a digital component
connected through the DIGITAL OPTICAL IN
jack, the digital connecting cable was unplugged or
the digital component turned off.

The editing operation of the HD is completed.

The system is copying a title or artist name.

The system is copying the text data.

4

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3-1. Bottom Plate,Case ······················································· 11
3-2. Front Panel Section ····················································· 11
3-3. POWER Board, AM/FM Tuner ··································· 12
3-4. HDD Board, HDD SUB Board ··································· 12
3-5. MAIN Board ······························································· 13
3-6. Cover (HDD-Top), Cover (HDD-Bottom) ·················· 13
3-7. AMP Board, REG Board ············································· 14
3-8. Switching Regulator ···················································· 14
3-9. Indicator (BS), LED Board (R) ··································· 15
3-10. LED Board (L) ···························································· 15
3-11. FL Board ····································································· 16
3-12. TOUCH SW Board, SWITCH Board ························· 16
3-13. CD Board ····································································· 17
3-14. BD Board ····································································· 17
3-15. Base Unit (BU-31BD63) ············································· 18
3-16. BU-31 Assy, Sled Motor Assy (M102) ······················· 18
3-17. CD Mechanism (CDM71B) ········································ 19
3-18. L.MOTOR Board ························································· 19
3-19. C.MOTOR Board, L.SENSOR Board ························· 20
3-20. ENCODER Board, D.SENSOR Board ······················· 21
3-21. Pulley (RTR) Assy, Pulley (RTL) Assy,

Belt (CDM71), Belt (Roller) (L) ································· 22

3-22. Pulley (SPT) Assy, Gear (RT) Assy, Gear(KT),

Belt (CDM71) ····························································· 24

···································································· 26

······························· 30

······································································ 31

6-1. Block Diagrams ··························································· 31
6-2. Circuit Boards Location ·············································· 34
6-3. Printed Wiring Board – BD Section (Side A) – ··········· 35
6-4. Printed Wiring Board – BD Section (Side B) – ··········· 36
6-5. Schematic Diagram – BD Section – ···························· 37
6-6. Printed Wiring Board – MOTOR Section – ················ 38
6-7. Schematic Diagram – MOTOR Section – ··················· 39
6-8. Printed Wiring Board – HDD1 Section (Side A) – ····· 40
6-9. Printed Wiring Board – HDD1 Section (Side B) – ····· 41
6-10. Schematic Diagram – HDD1 Section (1/2) – ·············· 42
6-11. Schematic Diagram – HDD1 Section (2/2) – ·············· 43
6-12. Printed Wiring Board – HDD2 Section – ···················· 44
6-13. Schematic Diagram – HDD2 Section (1/2) – ·············· 45
6-14. Schematic Diagram – HDD2 Section (2/2) – ·············· 46
6-15. Printed Wiring Board – MAIN Section (Side A) – ····· 47
6-16. Printed Wiring Board – MAIN Section (Side B) – ····· 48
6-17. Schematic Diagram – MAIN Section (1/2) – ·············· 49
6-18. Schematic Diagram – MAIN Section (2/2) – ·············· 50
6-19. Printed Wiring Board – CD Section – ························· 51
6-20. Schematic Diagram – CD Section – ···························· 52
6-21. Printed Wiring Board – AMP Section (Side A) – ········ 53
6-22. Printed Wiring Board – AMP Section (Side B) – ········ 54
6-23. Schematic Diagram – AMP Section – ························· 55
6-24. Printed Wiring Board – DISPLAY Section – ·············· 56
6-25. Schematic Diagram – DISPLAY Section – ················· 57
6-26. Printed Wiring Board – CONTROL Section – ············ 58
6-27. Schematic Diagram – CONTROL Section – ··············· 59
6-28. Printed Wiring Board – POWER Section – ················· 60
6-29. Schematic Diagram – POWER Section – ··················· 61
6-30. IC Pin Function Descriptions ······································ 63

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7-1. Case Section ································································ 72
7-2. Chassis Section ···························································· 73
7-3. Frot Panel Section ······················································· 74
7-4. Mechanism Section(CDM71B)-1 ································ 75
7-5. Mechanism Section(CDM71B)-2 ································ 76
7-6. Base Unit (BU-31BD63) ············································· 77

······································· 78