Sony HCD-C70 - Page 5

SECTION 1
SERVICING NOTE
¢ POWER SUPPLIED WHILE SERVICING
This unit does not have its own power supply. It operates on
the power supplied from the deck/amplifier (DXA-C70/C90)
used by this series. Therefore connect the amplifier when
servicing the unit as in electrical repairs.
Power
can
also
be
supplied
by
connecting
the
“CDP/TC”
connector of the conduction tool (PFJ-1). The following will
be required to connect it.
J-2501-063-A
1-696-741-11 cord, (with connector)
1-751-469-11 cord, (with connector)
The connection to the tuner board can be checked with Pin 5
(FM-R CH) and Pin 6 (FL-L CH) of CN307.
e¢ MEASURING THE TUNER/TCB011 BOARDS VOLTAGE
Prepare the following tools (extension cables) when
measuring the voltages of the TUNER and TCBO11 boards.
1) 4-pin extension cable (J-8000-026-A) x 3
2) 8-pin extension cable (J-8000-027-A) x 1
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer
electrostatic 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 reflectives surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode
emission, observe from more than 30 cm away from the objective
lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveform is output three times.