Sanyo SFX-110 Service Manual page 35

1. MODEM check
IS ELF cHEc K
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* check the cycle of 9600 BPS and 300BPS.
(Check OSC. of XTAL and connection of the INT for clock)
* Check DREQ cycle of 9600BPS.
(Check the switchover circuit relies on INT)
Check the receiving signal frequency witch is looped back
of 1100 Hz transmitted.
(For checking analogue circuit of Tx. and Rx.)
2. MUSIP Check
* Check SH cycle.
(Check the connection of INT4)
* Execute the scanning operation.
(Check the connection of INTO)
3. RTC Check
* Check INT cycle.
(Check OSC. of XTAL)
4. TPH l/F Check
* Check the pulse width of strobe signal generated on
test purpose.
(Check the operation of STBON, STBINT and the
connection)
Data Transfer (Check the connection of INT2)
IN CASE OF ERROR
1. MODEM CHECK
MODEM CLOCK NG ! : No clock detection possible
MODEM 300B NG ! : 300 BPS clock failure
MODEM 9600B NG
! : 9600 BPS clock failure
MODEM DREQ NG ! : No DREQ detection possible
MODEM DREQW NG
! : DREQ cycle failure
MODEM 11OOH NG ! : No 1100Hz detection possible
2. MUSIP CHECK
MUS I P SHWDT NG ! : Cycle failure
MUSI P INTR NG ! : Transfer failure
3. RTC CHECK
RTC lSEC. NG ! : Cycle failure
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t
SELF CHECK 2
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4. TPH l/F CHECK
TPH
T21NT NG ! : Cycle failure of STBINT
TPH
WIDTH NG ! : Cycle failure of STBON
TPH UDMA NG
! : DATA transfer error (No transfer request)
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