Sony CMT-EP50LIV / HCD-EP50LIV Service Manual ▷ View online
3
HCD-EP50LIV
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing 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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check 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.
ing safety check 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.
LEAKAGE TEST
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
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.
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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15
µ
F
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED
LINE WITH MARK
0
ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
The following caution label is located inside the unit.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the rear exterior.
4
HCD-EP50LIV
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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.
static 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.
NOTES ON LASER DIODE EMISSION CHECK
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 emis-
sion, observe from more than 30 cm away from the objective lens.
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
CHECK
1. Press the
I/1
button to the power ON with no disc inserted
and press the
[CD]
button.
2. Open the lid for CD.
3. Turn on SW300 as following figure.
4. Confirm the laser diode emission while observing the object-
3. Turn on SW300 as following figure.
4. Confirm the laser diode emission while observing the object-
ing lens. When there is no emission, Auto Power Control cir-
cuit or Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.
cuit or Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.
SECTION 1
SERVICING NOTES
SW300
5
HCD-EP50LIV
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
Cassette compartment qj (13)
CD 4 (8, 9, 14)
DISPLAY wf (9, 11)
Display Window 5 (8, 9, 10)
ENTER ql (7, 9, 10, 12)
ISS 0 (14)
MEGA BASS 8 (16)
MONO STEREO 0 (11)
MUSIC MENU 9 (16)
PHONES jack wa
PLAY MODE w; (8, 9)
PRESET +/– qk (10, 11, 12)
CD 4 (8, 9, 14)
DISPLAY wf (9, 11)
Display Window 5 (8, 9, 10)
ENTER ql (7, 9, 10, 12)
ISS 0 (14)
MEGA BASS 8 (16)
MONO STEREO 0 (11)
MUSIC MENU 9 (16)
PHONES jack wa
PLAY MODE w; (8, 9)
PRESET +/– qk (10, 11, 12)
DIR w; (12, 13, 14, 15)
Remote sensor wg
TAPE 3 (13)
TIMER indicator 2 (15, 18)
TUNER 6 (10, 11, 14)
TUNER MEM ql (10)
TUNING + qf (10, 11, 12, 15)
TUNING – qg (10, 11, 12, 15)
VOLUME control qd
Remote sensor wg
TAPE 3 (13)
TIMER indicator 2 (15, 18)
TUNER 6 (10, 11, 14)
TUNER MEM ql (10)
TUNING + qf (10, 11, 12, 15)
TUNING – qg (10, 11, 12, 15)
VOLUME control qd
Parts Identification
The items are arranged in alphabetical order.
Refer to the pages indicated in parentheses ( ) for details.
Main unit
1
2
3 4 5 6
7
8
9
q;
qh
qg
qf
qd
qs
qa
qk
ql
w;
wa
ws
wg
wf
wd
qj
BUTTON DESCRIPTIONS
@/1 (power) 1 (7, 11, 15, 18)
CD
. m (go back) qg (8, 9)
M > (go forward) qf (8, 9)
nN (play) qa (8, 9)
X (pause) wd (8)
Z PUSH OPEN/CLOSE 7 (8)
x (stop) qs (8, 9)
M > (go forward) qf (8, 9)
nN (play) qa (8, 9)
X (pause) wd (8)
Z PUSH OPEN/CLOSE 7 (8)
x (stop) qs (8, 9)
TAPE
M > (fast forward) qf (13)
X (pause) wd (13)
nN (play) qa (13, 14, 15)
z (recording) ws (14, 15)
. m (rewind) qg (13)
Z PUSH OPEN/CLOSE qh (13)
x (stop) qs (13, 14)
X (pause) wd (13)
nN (play) qa (13, 14, 15)
z (recording) ws (14, 15)
. m (rewind) qg (13)
Z PUSH OPEN/CLOSE qh (13)
x (stop) qs (13, 14)
6
HCD-EP50LIV
CD 3 (8, 9, 14)
CLOCK/TIMER qg (7, 15, 17)
DISPLAY qh (9, 11)
MEGA BASS 2 (16)
MUSIC MENU wa (16)
PLAY MODE/DIR qj (8, 9, 12,
CLOCK/TIMER qg (7, 15, 17)
DISPLAY qh (9, 11)
MEGA BASS 2 (16)
MUSIC MENU wa (16)
PLAY MODE/DIR qj (8, 9, 12,
13, 14, 15)
PRESET +/– qk (10, 11)
REPEAT 7 (8)
SLEEP qd (17)
TAPE w; (13)
TIMER ON/OFF qf (15, 18)
TUNER/BAND 5 (10, 11, 14)
TUNER MEM/ENTER 6 (7, 9,
REPEAT 7 (8)
SLEEP qd (17)
TAPE w; (13)
TIMER ON/OFF qf (15, 18)
TUNER/BAND 5 (10, 11, 14)
TUNER MEM/ENTER 6 (7, 9,
10, 12, 15, 17, 18)
TUNING/CLOCK/TIMER +/–
ql (7, 10, 11, 12, 15, 17, 18)
VOLUME +/– 4
BUTTON DESCRIPTIONS
M (fast forward) > (go
forward) 0 (8, 9, 13)
. (go back) m (rewind) qa
(8, 9, 13)
X (pause) qs (8, 13)
nN (play) 8 (8, 9, 13, 14, 15)
`/1 (power) 1 (7, 11, 15, 18)
x (stop) 9 (8, 9, 13, 14)
nN (play) 8 (8, 9, 13, 14, 15)
`/1 (power) 1 (7, 11, 15, 18)
x (stop) 9 (8, 9, 13, 14)
Remote Control
1 2 3 4
5
6
7
8
9
q;
qa
qs
qg
qd
qf
qh
qj
qk
ql
w;
wa
Setting the time
1
Turn on the system.
2
Press CLOCK/TIMER on the remote.
When you set the clock for the first time, go
to step 5.
to step 5.
3
Press CLOCK/TIMER on the remote
repeatedly until “SET CLK” appears in
the display.
repeatedly until “SET CLK” appears in
the display.
4
Press TUNER MEM/ENTER on the
remote.
remote.
5
Press TUNING/CLOCK/TIMER + or – on
the remote repeatedly to set the hour.
the remote repeatedly to set the hour.
6
Press TUNER MEM/ENTER on the
remote.
remote.
7
Press TUNING/CLOCK/TIMER + or – on
the remote repeatedly to set the minute.
the remote repeatedly to set the minute.
8
Press TUNER MEM/ENTER on the
remote.
remote.
To reset the system clock
Start over from step 1.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.
the power cord or if a power failure occurs.
