Sharp R-4A52

R -4A52
R-4E52
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
E SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described
in the following table.
Table: Terminal Connection of Switch
Plunger Operation
Released
Depressed
COM to NO
COM to NC
O.C. S.C.
_--- ---
S.C. O.C.
COM; Common terminal
S.C.; Short circuit
NO; Normally open terminal O.C.; Open circuit
NC; Normally closed terminal
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT 4R CHECKS.
F NOISE FILTER TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the terminal’
of the noise filter.
WHT
N*
0
g--Q
Using an ohmmeter, check between the
terminals as described in the following
table.
L hinl
Cx*ZO% CvtZmb
1.0 mti
0.066,lF 22OOpF
MEASURING POINTS
Between N and L
/ INDICATION OF OHMMETEf2i
1
I Open circuit
I
I
1 Between terminal N and WHITE
Short circuit
I
I
-..-----4
Between terminal L and RED Short circuit
---
----l
If incorrect readings are obtained, replace the noise filter unit. CARRY OUT 4R CHECKS
MONITOR RESISTOR TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the monitor resistor.
-<
Using an ohmmeter and set on a low range. .
Check between the terminals of the monitor resistor as described in the following table.
Table: Resistance
Resistor
Resistance
Monitor resistor Approx. 0.8R
If incorrect readings are obtained, replace the monitor resistor,
CARRY OUT 4R CHECKS.
13