Kohler M340+ - Page 127

5-66 Accessory Troubleshooting
TP-5672 11/95
LOCKED. Press theYES key andthen theENTER
key.
7. Press the RESET MENU key, and then press the
ENTER key to store the setpoints.
Remote Communication Hardware
1. Check the voltage at P13-1 on the Remote
Communication board. See Figure 5-73. Using a
voltmeter,connectthepositivetestleadtoP13-1on
the Remote Communication board. Connect the
negative test lead to P13-6. The voltmeter should
read five volts DC.
a. If the voltmeter reads approximately zero volts
DC, check the P13 ribbon cable connection to
the main logicboard by performing thefollowing
procedure.
b. Remove all power sources.
c. Wait 30 seconds.
d. Makingsurenottobendorbreakanyofthepins,
remove the P13 ribbon cable connector.
e. Inspect ribbon cable connector pin P13-1.
f. If anypins are bent, carefully bendthem back. If
any pins are broken, replace the ribbon cable
connector.
g. CarefullyreconnectP13ribboncableconnector.
If theP13ribboncableisgood, but the DCvoltage at pin
P13-1 is still zero, the main logic board is defective.
Replace the logic board assembly.
2. If the voltmeter reads approximately five volts DC,
check the voltage at P13-7 on the Remote
Communication board. Using a voltmeter, connect
the positive test lead to P13-7. Connect the
negative test lead to P13-6. The voltmeter should
read approximately ten volts DC.
a. If the voltmeter reads zero volts DC at P13-7,
check the P13 ribbon cable connection to the
main logic board by performing the following
steps.
b. Remove all power sources.
c. Wait 30 seconds.
d. Makingsurenottobendorbreakanyofthepins,
remove the P13 ribbon cable connector.
e. Inspect the ribbon cable connector pin P13-7.
f. If anypins are bent, carefully bendthem back. If
any pins are broken, replace the ribbon cable
connector.
g. CarefullyreconnectP13ribboncableconnector.
If theP13ribboncableisgood, but the DCvoltage at pin
P13-7 is still zero, the main logic board is defective.
Replace the logic board assembly.
Accessory DD-51 allows connection to an
IBM-compatible personal computer for remote transfer
switch monitoring. See Figure 5-73 for a wiringdiagram
for this accessory and Figure 5-74 for the
troubleshooting flowchart.
B-294499
(DD-51A) or
B-294501
(DD-51B)
Ribbon Cable
294638
P12
P13
Microcontroller
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
TB--AC1 TB--DC1
1
17
5604415
Figure 5-73. Wiring Diagram—Option DD-51-A and DD-51-B, Remote communications board