Sony MCC3000MT, Service Manual

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If the positive-characteristic thermistor works, turn off the main power of the unit and inspect the internal circuit of the
unit. After the cause of the fault is eliminated and the positive-characteristic thermistor is cooled down, turn on the main
power again. The unit works normally. It takes about one minute to cool down the positive-characteristic thermistor
after the main power is turned off.
Board Name Ref. No. Address Part No. Hold Current
DPR-340 THP100 A-2 (Side B)
1-803-353-21
0.14 A/20
℃
1-11-5. Lead-free 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
Notes
• 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 °C higher than the ordinary solder. Therefore, it is
recommended to use a 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.
1-11-6. Disconnecting/Connecting Flexible Card Wire
Notes
• Be very careful not to fold flexible card wires. Life of flexible card wire will be significantly shortened if it is folded.
• Each flexible card wire has conductive side and insulated side. If the flexible card wire is connected in the wrong
orientation of the conductive side and the insulated side, the circuit will not function.
• Insert the flexible card wire straight.
• Check that the conductive side of the flexible card wire is not contaminated.
Type A
A
Isolation
surface
Type A
Disconnecting
1. Turn off the power.
2. Slide or lift up the portion A in the direction of the arrow to unlock and pull out the flexible card wire.
MCC-3000MT
1-20