Bosch SHI 4302 Troubleshooting Tips page 12

Page B-4
Soldering # 266746, 263832 or 264461 Control Modules for SHU/I 43/53/68
& GM 915-710 Dishwashers
Occasionally, a heater relay terminal soldered to a # 266746, 263832 or 264461
control module pc board can burn. Heater relays can be resoldered to save
customers time and money.
resoldering a heater relay terminal.
CAUTION:
þ þ þ þ
Do not overheat solder joint -- pc board can be damaged by excessive heat. Make sure
soldering iron is fully heated before soldering and keep heating time as short as possible.
þ þ þ þ Use rosin core 60/40 solder when soldering pc boards as acid core can etch pc boards.
þ þ þ þ
Do NOT resolder if relay terminal or pc board is damaged -- replace entire control module.
þ þ þ þ
To avoid overheating pc board, use a moderately sized soldering iron (~ 25W).
Good board -- showing proper soldering
on back of pc board.
HINT:
Soldering irons give
superior results compared to
soldering guns - using an iron
with a small tip (~ 25W) reduces
possibility of damaging
board.
HINT: The heater relay is the
largest of three relays in the center
of the pc board & can be one of
two colors:
Black
1st Edition/Rev. 1
Service Bulletin
Please follow these instructions carefully when
CAUTION:
static electricity and can be damaged by personnel through
touch or close proximity. Personnel handling pc boards
should be grounded.
pc
DETAILED INSTRUCTIONS:
1. Carefully clean burned terminal with a small piece of extra
fine sandpaper, taking care not to scratch pc board.
2. Use an iron with a small tip. Heat soldering iron up to
temperature. Coat tip with small amount of solder.
3. Using rosin core 60/40 solder, hold tip of hot iron to
terminal and briefly touch terminal with solder. Don't use
excessive amount of solder to avoid damaging pc board.
Orange 4. Pull iron from terminal and let solder joint cool.
5. Inspect solder joint -- a good solder joint should be shiny,
not dull. If solder joint is dull, carefully resolder.
6. If joint is sound, carefully clean finished joint with a clean
cloth. Carefully remove any lint from pc board.
7. Reinstall pc board to control module, then reinstall control
module to dishwasher. Check dishwasher and make sure
it operates properly, including how it heats.
B
(excepting SHU 4322/4326)
Burned board -- showing burned
terminal on back of pc board.
Some pc board components are sensitive to
G
/
Wednesday, May 9, 2001