5
HCD-DH3/DH5BT/DH7BT
SECTION 1
SERVICING NOTES
MODEL IDENTIFICATION
– Back Panel –
MODEL
PART No.
DH3: Singapore
2-892-818-0
[]
DH3: Australian
2-892-818-1
[]
DH3: Korean
2-892-818-3
[]
DH3: Thai
2-892-818-6
[]
DH3: Chinese
2-892-818-7
[]
DH7BT
2-892-844-0
[]
DH5BT: Canadian
2-892-844-1
[]
DH5BT: AEP
2-892-844-2
[]
DH5BT: Singapore
2-892-844-3
[]
DH5BT: Australian
2-892-844-4
[]
DH5BT: Korean
2-892-844-6
[]
DH5BT: Taiwan
2-892-844-8
[]
DH5BT: Thai
2-892-844-9
[]
DH5BT: Russian
2-892-845-0
[]
DH5BT: Chinese
2-892-845-1
[]
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 reflective 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.
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
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•
Unleaded solder melts at a temperature about 40
°
C higher
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!
•
Strong viscosity
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.
•
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
RELEASING THE DISC ANTITHEFT
The disc lock function for the antitheft of an demonstration disc in
the store is equipped.
button to turn on the system.
Z
button until
“UNLOCKED” displayed on the fluorescent indicator tube
(around 5 seconds).
When “LOCKED” is displayed, the disc lock is not released by
turning power on/off with the
I/
1
button.
NOTES ON REPLACEMENT OF THE DMB15 BOARD
New part of EEPROM (IC103) on the DMB15 board cannot be
used. Therefore, if the mounted DMB15 board is replaced, exchange
new EEPROM with that used before the replacement.
PART No.
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