Description On Backup Battery; Circuit Protection Device; Unleaded Solder - Sony RCP-D50 Service Manual

1-18. Description on Backup Battery

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The lithium battery is a critical part to safe operation.
Replace the component with Sony part whose part number
is listed in the manual published by Sony.
If the component is replaced by any part other than the
specified ones, this may cause a fire or electric shock.
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When replacing the lithium battery, ensure that the battery
is installed with + and _ poles connected to the correct
terminals. An incorrect connection may cause an explosion
or leakage of fluid as a result, physical damage in the
surrounding materials may be caused.
A lithium battery on the MPU-126 board is used to back up
the date data to be stored in the memory stick. Reset the
date data using the RCP configuration menu in the Others
menu (Refer to the operating instluctions "Initial Set-
tings".) after replacing the MPU-126 board or the dead
battery.
Replacement part : BT301 (MPU-123 board)
Description : CR-2032 (Lithium battery)
! 1-528-174-11
Parts number :
Recommended replacement period : Every 7 years
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. When replacing the MPU-126 board, it is recommended
to replace the battery at the same time.
. Resetting the date data is required also when the battery
is removed from the battery holder.
RCP-D50
RCP-D51

1-19. Circuit Protection Device

The MPU-126 board is provided with positive thermistors
for power line to protect circuits. This device limits a
current by steeply increasing the inner resistance when the
device rises to a certain temperature due to overcurrent or
high ambient temperature. If the device is activates once,
turn off the power and check an equipment concerned; the
circuits in this unit. After the cause is eliminated and the
device cools off, turn on the power again. If there is no
trouble, the unit will operate normally. It takes about one
minute for the device to cool off after powering off the
unit.
MPU-126 Board
Ref. No. Address
*
THP105 D3
THP106 D3 *
*
THP301 B1
*: B side
VR-284/284A Board (suffix -21 and higher)
Ref. No. Address
*
THP500 E2
*: A side

1-20. Unleaded Solder

Boards requiring use of unleaded solder are printed with a
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
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. Be sure to use the unleaded solder for the printed circuit
board printed with the lead free mark.
. The unleaded solder melts at a temperature about 40 d
higher than the ordinary solder, therefore, it is recom-
mended to use the soldering iron having a temperature
regulator.
. The ordinary soldering iron can be used but the iron tip
has to be applied to the solder joint for a slightly longer
time. The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful.
Equipment protected
Circuits in this unit
Circuits in this unit
Circuits in this unit
Equipment protected
Circuits in this unit
1-19 (E)