Oki OKIFAX 5750 Maintenance Manual page 793

Okifax 5750/5950 facsimile transceiver

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No sound from the speaker

10: No sound from

Monitor or buzzer

Pulse wave input is provided

at pin 5 of IC21 when the

key is pressed or the soft

Replace IC2.

41285901TH Rev.3

Communication normal

See sending or receiving NG.

Replace IC21.

Sine wave or modulated

wave input is provided at

pin 13 of IC21 during

Replace TR15,TR309.

Either pin 9, 10, or 11 of IC21

becomes 5V when the key is

pressed or the soft ringer goes

or during communication

Sine wave or modulated wave

is input to pin 3 of IC20 when the

key is pressed or the soft ringer

goes or during communication

Sine wave or modulated wave is

output from pin 5 of IC20 when the

key is pressed or the soft ringer

goes or during communication

communication

Replace IC20.

Troubleshooting