SCR Component Checks
PS
S5.3
5230
F-code
Section
C-code
Version no
T-code
001
© BT Products
181
Service Manual
1997-04-15
To check an SCR, it is necessary to have a 6 volt battery and
2 a-14 diodes.
Connect the positive lead to the anode, connect the negative
lead to the cathode as shown below.
1. The lamp should not light. If the lamp does light, the
SCR is shorted and must be replaced.
2. If check (1) was satisfactory, test the SCR for its ability
to be turned on by the gate. Connect positive through
two diodes to the gate terminal. If the gate is operative,
the lamp will come on and remain on when the gate is
removed. Some SCR’s will operate correctly even if
the lamp dose not remain on, particularly with a weak
battery.
3. If the lamp cannot be lit under step 2 the SCR is open
and must be replaced.
NOTE! These tests may not prove a bad SCR. If in
doubt, replace the SCR.
Anode
Cathode
Gate
Anode
Cathode
Gate
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