Sakai SW800 Series, Shop Manual

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4-226
Troubleshooting for Electric System
b). LOW amplitude not selected.
* Wire color codes in parentheses ( ): SW800
➡
From Machine No.10123
SW850
➡
From Machine No.10127
Codes with no parentheses
➡
Common to both models
Solenoid code letters in brakets [ ] indicate solenoids for rear vibrators
★
Diagnose with vibrator switch ON.
YES
NO
1
YES
NO
Is specified voltage
present at ampli-
tude select sole-
noids b[a]
*1
(b[b])
*2
?
4
• About 47 Ω
• Disconnect wire
from solenoid.
• 20~28V
•
Amplitude selector
switch: LOW amplitude.
2
YES
NO
Is solenoid resist-
ance as specified
and is insulated
from chassis?
Does specified vol-
tage appear at
amplitude selector
switch terminal 2
*2
?
5
YES
NO
Does specified vol-
tage appear at ampli-
tude selector switch
terminal 1
*3
?
3
YES
NO
Is resistance of
solenoid earth wire
as specified?
• Lower than 1 Ω
• Disconnect wire
from solenoid.
• 20~28V
Possible cause Remedy
Solenoid valve defective.
(See H-03)
Amplitude select valve
solenoid defective
Renew.
Solenoid earth wire not con-
nected or incorrectly connect-
ed.
Repair or renew
wire.
Renew.
Repair or renew
wire.
Wire *3 from vibrator switch to
amplitude selector switch ter-
minal 1 not connected or
incorrectly connected.
Amplitude selector switch on
inoperative side defective.
Wire
*2
from solenoid to ampli-
tude selector switch terminal
2 not connected or incorrectly
connected.
Repair or renew
wire.
• 20~28V
•
Amplitude selector
switch: LOW amplitude.
*1 Solenoids which function when Low amplitude is selected.
(SW800:To Machine No.10122 SW850: To Machine No.10126)
• Front: b Wire color code WB
• Rear: a Wire color code LgY
(SW800: From Machine No.10123 SW850 From Machine No.10127)
• Front: b Wire color code WB
• Rear: b Wire color code LgY
*2 Color code of wire connected to amplitude selector switch terminal 2
• Front: WB(LR)
• Rear: LgY
*3 Color code of wire connected to amplitude selector switch terminal 1
• Front: Br
• Rear: Br