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ZL—6500
Error message or trouble symptom
LED does not activate
Failure in the LED
Failure in the KCU
Failure in the LED driver transistor (JC501, key PWB
Q2, Q3)
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Failure in th
NO RS232C I/F BOARD
(If the above message was displayed even though
the interface PWB is mounted.)
Failure in the IFEX signal (8255)
BAUD
RATE
SW IS XXXXXXXX
(tf does not match with the dip switch setting.)
Failure in the 74LS244 or 74LS32 of the interface PWB
Failure in the address decoder (74LS138), main PWB
Failure in the BRSW signal line
Failure in the dip switch
RS232C CH.
A OR B NOT CONNECT
(If the above message was displayed when the
loopback connector is used.)
The sum of thr PROM differs from the sum on
the display and printout
Failure in the address decoder
(74LS138, memory
PWB)
Failure in the CAR signal line
Failure in the card edge connector
Failure in the MR signal line
Failure in the PIO
Failure in the PIO BO thru B7 signal lines
Failure in the address decoder (74LS138) of the PROM cartridge
Failure in the ROM
size select block
Failure in the PIO
Failure in the RAM
cartridge card edge connector
NO RAM
CARTRIDGE
(If the above message was displayed even though
the RAM cartridge is installed.)
Failure in the PIO
Failure in the CARB, MRB, or MWB signal line
Failure in the CBO or DIRB signal line
Failure in the bus buffer, 40H244
or 245
Failure in the 74LS32 (1C7)
Failure in the VB circuitry (2SA673A, memory PWB)
Failure in the RESB signal line
Failure in the RAM
cartridge
RAM CARTRIDGE
ERROR
CLOSE THE COVER
OPEN THE COVER
(if the above message was displayed when the state
of the cartridge cover is indicated differently.)
Failure in the photo-sensor
Failure in the sensor connector or cable
Failure in the PIO
Damage on the sensor protrusion of the cover
Dirt or foreign matter in the photo-sensor
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