DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 95 / 163

Maintenance Manual DG-808C
Issued: June 2005 4.34
b) If the malfunction remains on the same circuit, then carry on according
to the following instructions:
b)1 Check the shorting cables, see item 2. b).
b)2 Checking the ignition, trigger and charging coils
Disconnect the connector plugs from the electronic
boxes see 1. and measure the resistance:
item
pin nos. resistance (Ohm)
primary ignition coil 1 76 and 77 (right) appr. 300
primary ignition coil 2 79 and 80 (left) appr. 300
trigger coil 1 75 and ground (right) appr. 170
trigger coil 2 78 and ground (left) appr. 170
With other values identify the defective part by the wire numbering see
wiring plan 8E250.
b)3 Checking the air gap between trigger coils and actuators (metal plates
on the magneto housing) with a gauge. The gap must be 0.45 – 0.55
mm (0.018in. –0.022in.) wide.
c) Checking the generator coil: Disconnect the engine main plug and
measure the resistance between wires 491 and 501. It should be appr.
0.5 Ohm.
Warning: Starting and operating the engine with spark plug
connectors taken off can damage the ignition electronic boxes. Check for
spark only with spark plugs fitted to the connectors and spark plug bodies
having ground connection.
4) Generator
a) If the red generator control light shines although the engine is running:
- Check the generator.
Disconnect the right hand side plug (in direction of flight) from the
control unit. Measure the resistance between pins A1 and A2 with the
engine stopped. It should be 0 up to 1 Ohm. Measure the resistance
between pins A1 and ground and A2 and ground. It should be infinite.
- If the measured results differ from the nominal values, the generator is
defective and must be replaced.