Panasonic TOUGHBOOK CF-45 Series Service Manual page 48

49 |
4.3.9 SERIAL COMMUNICATION DIAGNOSIS
Make sure that connecting cables, connectors and AC adapter are not loose or disconnected prior to testing:
a Ref. Page
No. Symptom. Meise ta aera Component} Shematic
No. Brose Result P i Diagrams
1 Data cannot be sent or is the COM port properly YES | Goto No. 1-2 peaEEy eee
received, 4-4 *
% set? : NO | Improper setting —_ _—
is the same transmission | YES | Goto No. 1-3 aS a=
1-2 | protocol set for both ihe :
sending and receiving units?_|. NO. | Improper setting == ae
E Check the
Does the RS-232C on the | YES | interface with the ae —
1-3 | Main PCB operate normally - _ - | other computer
under a loopback test? . z Ic19 Main 16
NO | Main PCB C22 Main 17
2 | Unit will not communicate fs the connection cable a | yEg | Goto No..2-2 — a:
with another computer 2-t.| dedicated cross-patched =
when connected directly. cable? NO. | Connection cable aie =
Is the same transmission | yES | Goto No. 2-3 — =
2-2 | protocol set for both the =
sending and receiving units?_| NO | Improper setting = —
Check the
Does the RS-232C on the | YES | interface with the — a
2-3 | Main PCB operate normally other computer
under a reverse test? Main 16
Main 17.
3 | Unit will not communicate woe
Is the COM t i
with modem. 3-1} set? Bee Prone,
Improper setting ——
3.2 | '8 the trasmission protocol Go to No. 3-3 pared =
correct? Improper setting — poten
Does the modem operate Line
3-3 | normally under a local
analog loopback test? Go to No. 3-4
Does the RS-232C on the | YES | Modem — =
3-4 | main board operate normally 3 C19 Main 16
under a loopback test? NO | Main PCB Ic22 Main 17
4 | Diagnostic Test reports Is the loop back device a Ic19 Main 16
problem in serial port. 44 properly attached to the NES" ManPCe IC22 Main 17
connector (for an external No | I Sti
loop back)?
Improper setting
—_
a