CMT-EP30, CMT-EP40, HCD-EP30, HCD-EP40 - 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 SW600 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.

MODEL

PART No.

EP30: AEP and UK models

4-235-167-0

[]

US and Canadian models

4-235-169-0

[]

Singapore model

4-235-170-0

[]

Australian model

4-235-171-0

[]

Taiwan model

4-235-172-0

[]

Mexican model

4-235-173-0

[]

Argentina model

4-235-174-0

[]

EP40: AEP and UK models

4-235-175-0

[]

Saudi Arabia model

4-236-316-0

[]

Headphone wire dressing:
a.) Draw the wire from Main board to Headphone Jack board along

the bottom side of heatsink.

b.) The wire must be kept away from the top side of Cassette board

at least 30 mm.

SW600

PART No.

CASSETTE board

MAIN board

HEADPHONE
board

at least 30 mm

heatsink