Test 8 - Diode/Resistor - Generac Power Systems 4451 & 4986 Repair Manual

section 6
Diagnostic tests
16
87
15 87a
86 85
30
13
Figure 6-13. – Starter Contactor Relay
14
14
4
4
Figure 6-14. – Testing Field Boost

TEST 8 - dIOdE/RESISTOR

PROCEDURE:
1. Set volt meter to the diode test range.
2. Disconnect the six pin connector from the Voltage Regulator.
3. Disconnect Connector C1. See Page 17 for connector location.
4. Disconnect both wires from the Resistor (R1).
5. Connect the positive meter test lead to the top terminal of the
diode (D1). Connect the negative meter test lead to the bottom
of the diode (D1). See Figure 6-15. INFINITY or an open condi-
tion should be measured.
Page 42
16
17
WIRING DIAGRAM
87a
30
87
86
85
3.0 vdc
R1
D2
14
WIRE 14
REMOVED
14
R1
4
4
Figure 6-15. – Diode Test Step 5
6. Connect the positive meter test lead to the bottom terminal of
the diode (D1). Connect the negative meter test lead to the top
of the diode (D1). Approximately 0.5 Volts should be measured.
14
WIRE 14
REMOVED
14
R1
4
4
Figure 6-16. – Diode Test Step 6
7. Set volt meter to measure resistance.
8. Connect one meter test lead to the top terminal of the diode
(D1). Connect the other meter test lead to the ground terminal.
INFINITY or an open condition should be measured.
9. Connect one meter test lead to one terminal of the resistor
(R1). Connect the other meter lead to the remaining terminal of
resistor (R1). See Figure 6-17. Approximately 25 ohms should
be measured.
OL
D2
.5 vdc
D2