13
3.1 DIAGNOSTIC TEST
Function Test
Function test is performed by the following key operation.
1. Press the POWER key while pressing any key.
2. Release the key when the optional mode selection display appears.
3. Press the [ - ] key to select the TEST.
The following display appears.
Figure 3.1 Test Screen
ROM, DRAM, SRAM and Battery check
The ROM, DRAM, SRAM and internal battery are checked and the results are displayed
as OK or NG. If NG appears, following devices are suspected to be defective.
ROM NG : U14 of the MAIN board
DRAM NG : U16 of the MAIN board
SRAM NG : U7/U8 of the MEM board
Battery NG : Battery (BT 1) of the MEM board
Key status
Press and release each key (except the POWER switch) one by one. If the key is normal,
its on-screen location lights in black while the key is pressed.
If some abnormal condition obtained, the PANEL and MAIN board are suspected to be
defective.
Key status
Position of Range knob
Gain knob setting
Position of Mode knob
Color bar
( 16 colors )
Program number
Battery check
ROM, DRAM and SRAM
check
Chapter 3. Troubleshooting
To Next Page
Loading...
