Table of Contents
Advertisement
Check 2, LCD Displays Anything?
1. Turn o the 4338B.
2. Turn on the 4338B while watching the LCD.
3. Check for a beep sound for a moment and if you see anything is displayed on the LCD.
4. If beep sounds and LCD displays something, proceed to \Check 3, LCD Operates Correctly?",
otherwise proceed to \Check 6, CPU Power LED Lights?".
Check 3, LCD Operates Correctly?
1. Turn on the 4338B.
2. Reset the 4338B.
3. Check if the LCD's back light is lit.
4. Press some front panel keys such as
displayed in the whole area of the LCD.
5. If the LCD operates correctly, proceed to \Check 4, Any Error Message on LCD?", otherwise
replace the LCD Assembly.
Check 4, Any Error Message on LCD?
1. Turn o the 4338B.
2. Turn on the 4338B while watching the LCD.
3. Check if the LCD displays any error message.
4. If an error has NOT occurred, replace the A1 Main Board Assembly, otherwise proceed to
\Check 5, CPU Related Error Message?".
Check 5, CPU Related Error Message?
1. If the error message is one of the following replace the A2 CPU Board Assembly, otherwise
replace the A1 Main Board Assembly.
a. ROM TEST FAILED
b. RAM TEST FAILED
c. EEPROM R/W FAILED
Note
When replacing the A2 CPU Board Assembly, refer to \Replacing the A2 CPU
Board Assembly" in Chapter 3 for handling the ROM and EEPROM on the A2
Assembly.
Check 6, CPU Power LED Lights?
1. Turn on the 4338B.
2. Check if the LED \+5 V" of DS1 on the A2 CPU Board Assembly lights. Refer to Figure 4-11
for DS1 location.
3. If the LED lights, proceed to \Check 7, Any Error Code on LED?", otherwise proceed to
\Check 8, CPU Fuse High Lead Voltage".
4-14
T roubleshooting
and check if the characters are correctly
4
Meas Prmtr
5
Advertisement
Table of Contents
