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PTT Unit
5）Inspection of PTT Relay
This test can be made without removing parts.
1.
Disconnect positive and negative cables from battery.
Remove PTT lead wire socket a from coupler.
2.
3.
Check PTT relay wires in accordance with the following
table.
Replace if out of specification.
Conductivity of PTT relay
{
Blue (L) - Black (B)
Coupler
Green (G) - Black (B)
Terminal 1 - Terminal 4 (-)
Terminal 2 - Terminal 4 (-)
Terminal 1 - Terminal 3 (+)
Terminal 2 - Terminal 3 (+)
Inspection of UP side relay
4.
As shown in the figure, connect blue terminal (L) in the
coupler to battery positive terminal and black terminal (B) to
negative terminal, and then, connect circuit tester leads to
PTT relay terminals 1 and 3.
Check electrical conductivity between terminals 1 and 3.
5.
Replace relay if non-conductive.
Inspection of DOWN side relay
6.
As shown in the figure, connect green terminal (G) in the
coupler to battery positive terminal and black terminal (B) to
negative terminal, and then, connect circuit tester leads to
PTT relay terminals 2 and 3.
7.
Check electrical conductivity between terminals 2 and 3.
Replace relay if non-conductive.
6）Inspection of PTT Switch
1.
Check electrical conductivity of PTT switch. Replace if out of
specification.
Lead Wires
Switch Position Sky Blue (Sb)
UP (Tilt Up)
Free
DOWN (Tilt Down)
24
Conductive
Conductive
Non-conductive
Red (R)
Pink (P)
2 G
2 G
a
B
L G
- +
B
R
DW
G
2 G
2 G
Up circuit
B
L G
-
+
2 G
2 G
Down circuit
B
L G
-
+
Sb
R
P
3 (+)R
3 (+)R
4 (-)B
1 L
4 (-)B
1 L
UP
L
PT
G
L
B
3 (+)R
3 (+)R
4 (-)B
4 (-)B
1 L
1 L
-
+
3 (+)R
3 (+)R
4 (-)B
4 (-)B
1 L
1 L
-
+
4st 9.9/15/20 2009
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