Checking Silicon Rectifier; Battery - Yamaha QT 50F Service Manual

White/Red
Black/Red
(Set tester at "R x 1 " position)
B. Checking Silicon Rectifier
1. Normal connection: connect the tester's
red lad (4-) to the silicon rectifier's red
point, and connect the tester's black
lead (—) to the rectifier's white point.
2. Check with reversed connections: Re-
verse the tester leads.
Rectifier
,i PI I
(Red>y IJTwhite)
LUi
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(Set tester at "Rx100" position)
— > Normal connection
"* Reversed connection
Normal
connection
Reversed
connection
Good
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Replace
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r - C A U T I O N :
The silicon rectifier can be damaged if
subject to overcharging. Special care
should be taken to avoid a shortcircuit
and/or reversed connections of the posi-
tive and negative leads at the battery.
Never connect the rectifier directly to
the battery to make a continuity check.
NOTE:
This rectifier test must be checked with both
normal and reversed connections.
C. Battery
1. Checking
a. If battery sulfation (white accumula-
tions) occurs on plates due to lack of
battery electrolyte, the battery should
be rplaced.
b. If the bottoms of the cells are filled with
corrosive material falling off the plates,
the battery should be replaced.
c. If the battery shows the following de-
fects, it should be replaced:
1)The voltage will not rise to a specific
value even after many hours of charg-
ing.
2) No gassing occurs in any cell during
charging.
3) The battery requires a charging vol-
tage of more than 8.4V in order to
supply a current of 0.4 for 10 hours.
Service life
The service life of a battery is usually 2
to 3 years, but lack of care as described
below will shorten the life of the battery.
Negligence in keeping battery topped
off with distilled water.
Battery being left discharged.
Over-charging with heavy charge.
d. Freezing.
e. Filling with water containing impurities.
f. Improper charging voltage/current on
new battery.
2.
6-fi