Oki OKIPAGE 10ex Maintenance Manual page 257

G-1 Error host I/F occurs frequently.
• Is the connection at the connector (CN2) properly engaged?
• Yes
• Yes
• Has the problem been solved?
• No
• Has the problem been solved?
• No
G-2 Loop test error occurs during loop test.
• Does the state of RXD-N signal vary?
• Yes
40990901TH Rev.1
• No Replace the connector (CN2).
Is the voltage at Pin 14 of Q11 (75188) about +8V and the voltage at Pin 1 of
Q11 (75188) about -8V?
• No Check the connection of the connector (CN1).
Replace Q11 (75188).
• Yes End.
Replace BF1 (ZBF253D-01).
• Yes End.
Failure of IC1 (MHM2029-004K) on the Main Control PCB (M5B).
• No Does the state of TXD signal at Pin 3 of Q11 (75188) vary?
• No Check the loop connector.
• Yes Does the state of TXD signal at Pin 2 of Q11 (75188) vary?
• No Failure of IC1 (MHM2029-004K) on the Main Control PCB
(M5B).
• Yes Replace Q11 (75188).
Failure of IC1 (MHM2029-004K) on the Main Control PCB (M5B).
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