Servicing Notes - Sony MEX-BT2500 Bedienungsanleitung

MEX-BT2500
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
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical pick-
up block.
semi-fixed resistor
EXTENSION CABLE AND SERVICE POSITION
When repairing or servicing this set, connect the jig (extension cable)
as shown below.
• Connect the MAIN board (CN350) and the SERVO board
(CN2) with the extension cable (Part No. J-2502-076-1).
MAIN BOARD
(CN350)
4
SECTION 1

SERVICING NOTES

UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 ˚C higher
• Strong viscosity
• Usable with ordinary solder
optical pick-up
TEST DISCS
Use following TEST DISC when this set confirms the operation
and checks it.
3-702-101-01 YEDS-18 (for CD)
4-225-203-01 PATD-012 (for CD)
J-2502-063-1 TCD-R082LMT (for CD-R)
the lead free mark due to their particular size)
: LEAD FREE MARK
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
J-2502-076-1
SERVO BOARD
(CN2)