Sony D-99 - Section 2 SERVICING NOTES; Handling the Optical Pick-up Block; Before Replacing the Optical Block; Flexible Circuit Board Repairing

@
(stop)
button
Ke
mrt
(AMS*/SEARCH/INDEX)
buttons
ml (play/pause) button
OPEN button
REMOTE jack
Connect the optional
remote control unit.
LINE OUT jack
{stereo mini jack)
BASS BOOST switch
DC IN 9 V jack (external power input) jack
D-99
SECTION 2
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer
electrostatic breakdown because of the potential difference
generated by the charged electrostatic load, etc. on clothing
and the human body.
During repair, pay attention to electrostatic breakdown 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,
Before Replacing the Optical Block
Please be sure to check thoroughly the parameters as par
the “Optical Block Checking Procedures” (Part No. : 9-960-
027-11)
issued
separately
before
replacing
the
optical
block,
Note and specifications required to check are given below.
e
FOK output : IC501@pin
When checking FOK, remove the lead wire to spindle
motor
and
unsolder
and
open
IC801@pin
(FOK),
* S carve P-to-P value : 3Vp-p
When checking S carve P-to-P value, remove the lead wire
to spindle motor,
* Adjusted part for focus gain adjustment : RV505
* RF signal P-to-P value : 0.7 — 1.25Vp-p
* Traverse signal P-to-P value: 1.5Vp-p
* The repairing grating holder is impossible,
* Adjusted part for tracking gain adjustment : RV501
Flexible Circuit Board Repairing
* Keep the temperature of the soldering iron around
270°C during repairing,
Do not touch the soldering iron on the same conductor
of the circuit board (within 3 times),
Be careful not to apply force on the conductor when
soldering or unsoldering,
°
Notes on chip component replacement
* Never reuse a disconnected chip component,
* Notice that the minus side of a tantalum capacitor may
be damaged by heat,