2-7 (E)
CNU-500
AT-100 Com. check mode. (AUTO)
MSU
CCU1
CCU2
CCU3
CCU4
CCU5
CCU6
RCP1
RCP2
RCP3
RCP4
RCP5
RCP6
VCS
OK
NG
NG
NG
NG
NG
NG
Push [SET] key !!
AT-100 Main check mode. (AUTO)
EPROM Check
OPTION FLASH Check
OK
RAM Check
OPTION EEPROM Check
SWITCH Check
OK
WRITE
ERASE
READ
S2
S3
S4
S5
Check end Push [SET]key
OK
OK
OK
OK
OK
NG
F
DOWN
CANCEL
N / P CHANGE Check
NTSC
PAL
Trouble 8
: An NG message is displayed at the point
where a CCA-5 cable is connected.
Remedy
: The MSU
↔
RCP1 display is NG.
→
Confirm if IC902 and its peripheral
block, and IC305 and its peripheral
block are not defective.
The CCU1
↔
RCP2 display is NG.
→
Confirm if IC304 and its peripheral
block, and IC405 and its peripheral
block are not defective.
The CCU2
↔
RCP3 display is NG.
→
Confirm if IC404 and its peripheral
block, and IC505 and its peripheral
block are not defective.
The CCU3
↔
RCP4 display is NG.
→
Confirm if IC504 and its peripheral
block, and IC605 and its peripheral
block are not defective.
The CCU4
↔
RCP5 display is NG.
→
Confirm if IC604 and its peripheral
block, and IC705 and its peripheral
block are not defective.
The CCU5
↔
RCP6 display is NG.
→
Confirm if IC704 and its peripheral
block, and IC805 and its peripheral
block are not defective.
The CCU6
↔
VCS display is NG.
→
Confirm if IC804 and its peripheral
block, and IC903 and its peripheral
block are not defective.
2-6. Self-Diagnosis
Fig. 7
Trouble 7
: The signal input to the REFERENCE
connector appears as an NG display or
the NG display stops halfway.
Remedy
: Confirm that IC42 or its peripheral block
(area enclosed with A-13, I-15, G-13, and
G-15 on AT-100 printed circuit board),
and CN1 harness are not defective.
d) Command Block Check
1.
Confirm that the display shown in Fig. 7 appears and
set S5 switch (on the AT-100 board panel) to the SET
position. Release S5 switch (on the AT-100 board
panel) just when the display shown in Fig. 8 appears.
Confirm that an OK message is displayed at the point
where a CCA-5 cable is connected and that an NG
message is displayed at the point where it is not
connected.
Fig. 8
Summary of Contents for CNU-500
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