2-18
DNW-A22/A22P
2-11. Function of LEDs on Circuit Boards
2-11. Function of LEDs on Circuit Boards
Blinking pattern of D108 on SS-63 board
Light on
off
Normal state
30 ms
1.1 to 1.5 s
ROM checksum error
Scores of milliseconds
RAM error
System control dual port RAM error
0.1 s
0.1 s
0.5 s
0.5 s
Repeat
0.1 s
0.5 s
0.5 s
0.5 s
Repeat
Light on
off
Light on
off
Light on
off
Scores of milliseconds
Scores of milliseconds
Repeat
SS-63 board
LED No.
Name
Color
Description
Normal state
D108
SV
Amber
Represents the result of communication test of ROM and RAM in power-on
Blinks
by blinking pattern. (Refer to below.)
D112
TRVR
Amber
Lights when the tracking VR is enable.
Off
D301
DRUM
Amber
Blinks when the drum microcomputer (IC314) is under normal operation.
Blinks
Usually lights for 30 milliseconds at intervals of 1.1 to 1.5 second.
The blinking interval is inverted when the drum is locked.
D1102
SY1 STS1
Green
Blinks when SYS1 CPU operates normally.
Blinks
D1103
SY1 STS2
Green
Lights in good communications between SYS1 CPU and KY MPU (KY-364 board). On
Turn off in bed communications between SYS1 CPU and KY MPU (KY-364 board).
D1104
MAINTE
Green
Lights during executing maintenance mode.
Off
D1105
SY1 ERR
Red
Lights when SYS1 CPU does not operate normally.
Off
Blinks in bad communications between SYS1 CPU and other CPU/MPU
(SYS2, KY, etc.).
D1902
SY2 STS1
Green
Blinks when SYS2 CPU operates normally.
Blinks
D1903
SY2 STS2
Green
Lights in good communications between SYS2 CPU and SV CPU.
On
Turn off in bad communications between SYS2 CPU and SV CPU.
D1904
SY2 STS3
Green
Lights in good communications between SYS2 CPU and SYS1 CPU.
On
Turn off in bad communications between SYS2 CPU and SYS1 CPU.
D1905
SY2 ERR
Red
Lights when SYS2 CPU does not operate normally.
Off
Blinks in bad communications between SYS2 CPU and other CPU (SYS1, SV, etc.).
Upper
Lower
SS-63 board
D1905
D1904
D1903
D1902
D1104
D1103
D1102
D112
D1105
D301
D108