Sym DD 50 Service Manual page 148

Electrical System Circuit Inspection
Pulse Generator / Exciting Coil
Remove body cover.
Disconnect alternator connector.
Resistance Measurement: (20℃)
Pulse generator coil (blue/yellow - ground):
50~200Ω
Exciting (yellow - ground): 400~800Ω
CDI Electrical System Circuit Inspection
Remove front cover.
Disconnect the CDI set connector, and check its
circuit to diagnosis related ignition components.
CDI Electrical System Circuit Inspection
ITEM
Main Switch
Exciter Coil
Pulse Generator
Primary
Ignition Coil
Secondary
If above checks are in normal but spark plug is still no spark. Then it probable causes from CDI set
or high voltage coil.
If abnormal circuits are found in above checks, at first check all items, and then check each item one
by one.
This chapter Contents
Measure at:
Black/white-green
Black/Red-Green
Blue/Yellow-green
Black/yellow-green
Green-high voltage cable -w/o Cap
Green-high voltage cable - w/ Cap
15. ELECTRICAL EQUIPMENT
C.D.I.
Standard (at 20℃)
Continuity as main switch OFF
400 ~800Ω
0.21Ω±10%
AC generator
harness connector
50 ~200Ω
3~5KΩ
7~12KΩ
15-11