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TROUBLESHOOTING & REPAIR
FIGURE F.38 – SERIAL LOOP WIRING DIAGRAM
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Serial Loop
Master
Transmit &
Receive Lines
Display Board Port Switch
Open: DK Board S.L. Comunication enabled
Closed: DK Board S.L. Comunication disabled
WF1
Port Switch
Open: WF1 S.L. Comunication enabled
Closed: WF1 S.L. Comunication disabled
WF2
Port Switch
Open: WF2 S.L. Comunication enabled
Closed: WF2 S.L. Comunication disabled
5 | J22 |
| (5R) |
|
| J44 |
|
|
|
|
| 5 | |
TxD |
|
|
|
| 40mA current supply | |
|
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| |
RxD |
|
| DISPLAY BOARD | POWER BOARD | ||
|
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| |
DK+ | J26 | (263) | J14 |
|
|
|
3 |
|
| 6 |
|
|
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|
|
|
| TRN |
DK- |
|
|
|
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| REC |
J26 | (264) | J14 |
|
|
| |
|
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| |||
4 |
|
| 3 |
|
|
|
|
|
|
|
| WF1 | |
|
|
| WF1 |
|
| |
WF+ | J27 | (111A) |
| P83 |
| 82(+) |
1 |
|
| L | H | ||
|
|
|
| |||
|
|
|
|
|
| TRN |
|
|
|
|
|
| REC |
WF- | J27 | (112A) |
| P83 |
| |
4 |
|
| M | G | ||
|
|
|
| |||
|
|
|
|
| WF2 | |
|
|
| WF2 |
|
| |
OPT+ | J28 | (117A) | L | P82 | H | 82(+) |
1 |
|
|
|
| ||
|
|
|
|
|
| TRN |
|
|
|
|
|
| REC |
OPT- | J28 | (118A) |
| P82 | G | |
4 |
|
| M | |||
|
|
|
| |||
|
|
|
|
| POWER BOARD | |
| J22 |
| (5W) |
|
| J44 |
4 
4
40mA
CONTROL BOARD
current path
