CMT-EP505, HCD-EP505 - Sony Audio Service Manual (repair manual). Page 4

4

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.

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.

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.

SW300

Power Voltage Indication

Power Voltage

Indication

AC: 120 V 60 Hz 35 W

AC: 220 – 230 V - 50/60 Hz 40 W

AC: 230 V - 50/60 Hz 40 W

Model

US and Canadian
 models

Argentina model

Other models