Kohler M340+ - Page 118

5-57
Accessory Troubleshooting
TP-5672 11/95
Troubleshooting The Manual
Transfer-To-Normal Source Pushbutton
If the Manual Transfer-to-Normal Source pushbutton is
not operating, connect TB-DC1-2 to TB-DC1-34.
1. If grounding TB-DC1-2 causes a transfer to the
normal source when the system is in the Manual
modeandis waitingto betransferredto the normal
source but the Manual Transfer-To-Normal Source
pushbutton is not operating, check the Manual
Transfer-to-Normal Source pushbutton and the
wiring to the Manual Transfer-to-Normal Source
pushbutton.
2. If groundingTB-DC1-2does not causea transferto
thenormalsourcewhenthesystemisintheManual
modeandis waitingto betransferredto the normal
source, check the continuity between P2-2 and
TB-DC1-2.
a. Remove power from the logic board.
b. Disconnect the P2 ribbon cable connector from
the power supply board.
c. Using an ohmmeter, connect one test lead to
P2-2 on the power supply board. Connect the
other test lead to TB-DC1-2. If there is an open
circuit, replace the power supply board. If the
resistance is low, the main logic board is bad.
Replace the logic board assembly.
Troubleshooting The Manual
Transfer-To-Off Pushbutton
If the Manual Transfer-to-Off pushbutton is not
operating, connect TB-DC1-12 to TB-DC1-34.
1. If groundingTB-DC1-12causesatransfertotheoff
positionwhenthesystemisintheManualmodeand
iswaitingto betransferredtotheoffpositionbutthe
Manual Transfer-To-Off pushbutton is not
operating, check the Manual Transfer-to-Off
pushbutton and the wiring to the Manual
Transfer-to-Off pushbutton.
2. If grounding TB-DC1-12 does not cause a transfer
to the normal source when the system is in the
Manualmodeandis waitingtobetransferredto the
normalsource, check the continuity betweenP2-11
and TB-DC1-12.
a. Remove power from the logic board.
b. Disconnect the P2 ribbon cable connector from
the power supply board.
c. Using an ohmmeter, connect one test lead to
P2-11 on the power supply board. Connect the
othertest leadtoTB-DC1-12. If thereis an open
circuit, replace the power supply board. If the
resistance is low, the main logic board is bad.
Replace the logic board assembly.
S6--4 134
134S7--4
107
S6--3
102TBDC1--2
TBDC1--7 107
S7
S6
TBDC1--34134
134S6--4
MICROCONTROLLER
TB--DC1TB--AC1
ECS
EAS
NCS
NAS
LC
LB
LA
EC
EB
EA
NC
NB
NA
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
17
NO
3 4 43
NO
JJ
Wire Code Example
S10--13—201
Device Name
Wire Number
Device Terminal
Number
5604537
Transfer to Emergency
Transfer to Normal
TBDC1--7
Figure 5-61. Wiring Diagram—Option DD-29-P and DD-29-R, Manual operation switches