4
HCD-EP50
NOTES ON HANDLING THE OPTICAL PICK-UP
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.
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.
LASER DIODE AND FOCUS SEARCH OPERATION
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-
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.
SECTION 1
SERVICING NOTES
• MODEL IDENTIFICATION
– 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.
