DOWNLOAD Sony CMT-L7HD / HCD-L7HD Service Manual ↓ Size: 10.52 MB | Pages: 94 in PDF or view online for FREE

5

This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.

This caution
label is
located inside
the unit.

        After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.

    The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1.

A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2.

A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3.

Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

µ

Ω

0

0

• N ever reuse a disconnected chip component.
•

Notice that the minus side of a tantalum capacitor may be
damaged by heat.

• K eep the temperature of soldering iron around 270˚C

during repairing.

•

Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

•

Be careful not to apply force on the conductor when soldering
or unsoldering.

0

6

The hard disc has a high storage density and reads or writes data in
a short time with compared to the floppy disk. On the other hand, it
may be easily damaged by mechanical vibration, shock or dust.
Keep the hard disc away from magnets.
Although the hard disc has safety devices to prevent losing data due
to mechanical vibration, shock or dust, you should be careful when
handling the recorder. Avoid damaging your data:
•

Do not cause a shock or strong vibration to the recorder.

•

Do not place the recorder in a location subject to mechanical
vibration or in unstable location.

•

Do not move the recorder while the power is on.

•

Do not turn off the recorder while the HDD indicator lights up
blue.

•

Do not use the recorder in a place subject to extreme changes in
temperature (temperature gradient less than 18 

°F (10 °C)/ hour).

• K eep any magnetic objects, including a TV set, speaker, magnet,

and magnetic bracelet, away from the recorder.

If the hard disc is damaged, data cannot be restored or recovered.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

Unleaded solder has the following characteristics.
•

Unleaded solder melts at a temperature about 40

°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350

°C.

Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

•

Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

•

Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

Cause of the Digital Amplifier, do not connect the speaker terminals
to the chasis, or connect the terminals of the right speakers with
those of the left speaker. (None of the speaker terminals is the
negative(–) terminal of the speaker. So,do not connect the earth lead
of this unit to the speaker terminals.)

7

JIG
(J-2501-077-A)(13P)

BD board

FL board

JIG
(J-2501-076-A)(11P)

chassis

FM/AM tuner

JIG
(J-2501-167-A)(17P)

JIG
(J-2501-076-A)(11P)

JIG
(J-2501-077-A)(13P)

JIG
(J-2501-167-A)(17P)

JIG
(J-2501-202-A)(11P)

BD board

HDD SUB board

HDD IF board

hard disk

chassis

FM/AM tuner

8

This section is extracted
from instruction manual.

ALBUM dial qf (18, 19, 21, 26)
CD cover 2 (14, 15)
CD u qa (14 - 16, 25)
CD x qs (15, 16, 24, 25)
DISPLAY 8 (39, 44, 45)
Display window 1 (44, 45)
FUNCTION qh (14 - 22, 25 - 28,

30, 32 - 35, 57)

HD u 9 (18, 20 - 22, 25, 26)
HD x q; (18, 25, 26, 30)
HIGH SPEED SYNC ql (25)

PHONES jack 7
REC w; (26, 28)
Remote sensor 6
STORAGE MODE qk (14, 25,

26)

TUNER/BAND qd (37, 38)
TUNING +/– qj (37, 38)
VOL +/– qg (41)

1

2

3

7 89q;qaqsqd

qg

qh

qj

w;qlqk

6

5

4

qf

@/1 (power) 4 (11, 41, 42)
./> qj (15, 16, 18)
m/M qj (15, 18)
Z 3 (14, 15)
V OPEN 5

To open the front cover, push
down on V OPEN.