Sanyo SFX-33 Service Manual page 35

1. MODEM check
* check the cycle of 9600 BPS and 300BPS.
(Check OSC. of XTAL3 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 XTAL3)
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
MODEM 300B NG
MODEM 9600B NG
MODEM DREQ NG
MODEM DREQW NG
MODEM 11OOH NG
2. MUSIP CHECK
MUS I P SHWDT NG
MUSI P INTR NG
3. RTC CHECK
RTC lSEC. NG
4. TPH l/F CHECK
TPH T21NT NG
TPH WIDTH NG
TPH UDMA NG
! : No clock detection possible
! : 300 BPS clock failure
! : 9600 BPS clock failure
! : No DREQ detection possible
! : DREQ cycle failure
! : No 1100Hz detection possible
! : Cycle failure
! : Transfer failure
! : Cycle failure
SELF CHECK 1
v
SELF CHECK 2
IS ELF CHECK 31
SELF CHECK 4 -
I
&
! : Cycle failure of STBINT
! : Cycle failure of STBON
! : DATA transfer error (No transfer request)
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