GW Instek GUT-6000A - Manual (Page 12)

GUT-6000A USER MANUAL
12
TROUBLE SHOOTING
SITUATIONS REASONS HOW
● LCD’s dark backlight
● No message on the LCD
●BUZZER no sound
● No response from key
board
∵ Power off
∵ Loose AC power cord
∵ Burned fuse ∴ Reset Power
∴ Tighten AC power cord
∴ Replace fuse
∵ Loose LCD connector.
∵Power supply damaged ∴ Tighten LCD connector & plug
∴ Contact regional distributor for
assistance
● BUZZER no sound
● LCD’s back light is on
● LCD message appears
● Response by any key on
the key board
∵ BZZER off ∴ Press BUZZER to switch
∵ BUZZER damaged
∵Components Q11,R3
damaged
∴ Replace SP1
∴ Replace Q11, R3
● LCD appears irregular
● LCD back light is dark
● Buzzer is no problem
∵ Loose LCD flat cable
∵ Damaged LCD’s unit ∴ Tighten LCD’s flat cable
∴ Replace LCD’s unit
● IC test unstable ∵ Bad connection between
IC and socket
∵ SOCKET unclear or
damaged
∵ Defective IC ∴ Re-put IC, and pull down pin-
stabler
∴ Replace a SOCKET
∴ Replace an IC
∵ Loose CPU
∵ Unstable internal circuit ∴ Check U1
∴ Re-put U.
∴ Connect local distributor for
assistance
● Some keys no response ∵ Key board damaged ∴ Replace U4
∴ Replace a keyboard.
● LCD’s black light is on
● LCD shows unstable
● No buzzer sound
● No response by pressing
any key on the key board
∵ Loose CPU
∵ Loose internal connector
∵ Internal circuit unstable
∵ Power supply damaged ∴ Check U1
∴ Re-put U1
∴ Tighten internal connector & plug
∴ Connect local distributor for
assistance