Function Of Leds On Circuit Boards - Sony DNW-A22 Maintenance Manual

2-11. Function of LEDs on Circuit Boards

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