Alfa Romeo 33 owners manual page 111

text version of content this owner's manual page from owners manual to the vehicle Alfa Romeo 33, year of production 1983 - 1995:

IGNITION, STARTING, CHARGING SYSTEM Diode resistance in direct conduction Reverse the two prods The tester 7. Brush spring inspection R = 0-lOa The brush springs should be stiff should show the prescribed re- enough to assure good brush contact sistance. Power diodes- bridge inverted test on the slip rings. If they are not, put (I) Zero tester in thea x 100 range in a new voltage regulator unit. Direct current resistance 8. Brushholder unit electrical scale. R = O+lOa continuity inspection (2) Carry out inverted-test of bridge operating as per direct test, by (1) Set the tester to the52 x 100 (2b)The rester shows current flow scale. inverting (in sequence) probes be- and therefore the prescribed resis- tween positive heat sink andthe (2) Put one prod on one and then tance. on the other brush0. three phases of bridge when testing Reverse the prods and the tester positive bridge. (3) Put the other prod on the current flow (infinite shows no terminal 0. resistance). Inverts (in sequence) probes between negative heat sink and the three (4) The tester should show current flow. CAUTION: phases when testing negative bridge. (3) Verify on tester that current is (5) If there is noeletrical conri-All excitation diodes must be tested nuity, check the brush holder and if not present. in this way. necessary put in new brushes and/or brush holder. Diode resistance for inverted conduction R =mcL 1 Diode holder plate 1 Positive hear sink 1 Brushes 2 Terminal 2 Negative test sink (3) If the tester readings are not DUCELLIER ANDMARELLI Energiration Diode Direct test those prescribed, put in a new diode holder plate. (1) Zero tester in thea x 1 range scale. (2) Connect tester negative probe 9-2. Ducellier Alternator andMarelli with output of energization diodes (terminal D+) and second probe Power diodes- Bridge direct rest (1) Zero tester in thea x 1 range(in sequence) with the three phases. scale. (3) Verify on tester, that resistance (2) Carry out direct test of positive values for direct current are the bridge, by setting the tester negative required ones. Diodes inspection probe on positive heat sink of bridge c 9. and the other probe, sequentially, 9-1Bosch Alternator Diode R for direct current on each end of the three phases of Set the tester to zero on thefi x R = 0+1os2 (I) bridge. Check, ontesrer, that resis- 1 scale. tance value for direct current is the Energization Diodes Inverted test (2) Put the prods on a diode termi- nals. required one. (1) Zero resterin the ax 100 range (3) Carry out direct test of negative Then either: scale. bridge, by setting the tester positive (2a) The tester shows no current flow (2) Operate as per direct test by probe on negative heat-sink of bridge (infinite resistance). inverting tester probes between out- and the other-probe, sequentially, put of energization diodes (terminal on each end of the three phases of Inverse current resistance D+) and the three phases (in se- bridge. Check on tester, that resis- R =w quence). Verify,. on tester, that tance values is the required one. current is not present. 05-23 May 1983

owners manual Alfa Romeo 33

owners manual Alfa Romeo 33 - year of production: 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995 - Alfa Romeo 33 owners manual EN