Sony CMT-EP50 / HCD-EP50 Service Manual ▷ View online
4
HCD-EP50
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
• MODEL IDENTIFICATION
– Bottom View –
– Bottom View –
MODEL
PART No.
AEP and UK models
4-235-177-0
[]
US and Canadian models
4-235-179-0
[]
Singapore and Hong Kong models
4-235-180-0
[]
Mexican model
4-235-182-0
[]
Argentina model
4-235-183-0
[]
Chinese model
4-238-634-0
[]
SW300
PART No.
Ver 1.1
5
HCD-EP50
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)
RDS (European model only)/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
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
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)
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
LOCATION OF CONTROLS
– Front Panel –
– Front Panel –
6
HCD-EP50
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.
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/RDS (European
CLOCK/TIMER qg (7, 15, 17)
DISPLAY qh (9, 11)
MEGA BASS 2 (16)
MUSIC MENU wa (16)
PLAY MODE/RDS (European
model only)/DIR qj (8, 9, 12,
13, 14, 15)
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
HCD-EP50
7
• This set can be disassembled in the order shown below.
3-1.
DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY
3-4. CD CABINET SECTION
(Page 9)
3-2. FRONT PANEL SECTION
(Page 8)
3-6. TAPE MECHANISM DECK
(CRL3439)
(Page 10)
(Page 10)
3-5. CD MECHANISM DECK
(CS-21SC-1280)
(Page 9)
(Page 9)
3-7. CASSETTE LID
(Page 10)
3-3. MAIN BOARD
(Page 8)
SET
