1975 Datsun 280z FSM - Spooled up Racing

Engine Electrical System
Criterion:
When rated timing delay
appears
OK
When smaller timing delay or
no delay appears
N.G.
If the result is "N.G." - Take the
following measures:
1. When a small delay appears, adjust
an advance-side pick-up coil in the
distributor.
2. When no delay appears, adjust an
advance-side pick-up coil in the distributor
(to advance further). If delay
is still too small, replace the transistor
ignition unit.
6-4. Checking lock
preventive circuit
Transistor ignition unit
— If a circuit tester is used —
Procedure:
1. Connect a circuit tester as shown
in Figure EE-82 or EE-85; positive
terminal of tester is connected to "L"
color wire and negative terminal of
tester is grounded.
2. Turn on ignition switch. Check to
see whether the tester indicates the
voltage of power source (battery)
within 10 seconds after ignition switch
is turned on.
Criterion:
When power source voltage
is indicated
OK
When approximately zero-voltage
is indicated
N.G.
If the result is "N.G." - Take the
following measures:
Replace transistor ignition unit.
California model
Transistor ignition unit
Non-California model
EE381
Fig. EE-85 Checking lock preventive circuit
- If an oscilloscope is used -
Procedure:
1. When using an oscilloscope instead
of a tester, arrange the connection
in the same way as shown in
Figure EE-82 or Figure EE-85. Turn
on ignition switch.
Check to see whether the wave
form on the oscilloscope rises up to
the power source voltage within about
10 seconds after ignition switch is
turned on.
Criterion:
The same as described before for
use of a tester.
Power source voltage
ov
I EE260
Fig. EE-86 Wave form of lock preventive circuit
EE-37