Faultfinding Guide
GB 44
CDR600
8.
8.1.3 Display board troubleshooting guide
Figure 8-9 ‘Display board troubleshooting’
SWITCH POWER ON,
EXIT STAND BY
MODE
DISPLAY BOARD
OK
DISPLAY?
CHECK :
•
SUPPLY
VOLTAGES
⇒
-38V
±
5% at conn. 1119-2
⇒
3V8
±
10% between conn. 1119-1 and 1119-3
⇒
+5V
±
5 % at conn. 1119-10 (1121-4 for CDR570/930)
•
CLOCK SIGNAL
⇒
8Mhz at pins 8, 9 of IC7104
•
CONTROL SIGNALS
⇒
RESETN 3V3 (high) at conn.1119-4 after start up
⇒
I2C DATA at conn. 1119-5
⇒
I2C CLK at conn. 1119-7 (1121-1 for CDR570/930)
•
FTD DRIVE LINES
⇒
Filament voltage 3V8
±
10% between pins 1-2-3 and
pins 45-46-47 (pins 1-2 and pins 48-49 for CDR
570/930) of the FTD (1113)
⇒
Grid lines (see test instructions)
⇒
Segment lines (see test instructions)
•
ELECTRICAL SERVICE DIAGNOSTICS - Local display test
YES
YES
YES
KEY
FUNCTIONS?
REMOTE
CONTROL?
NO
NO
CHECK:
•
KEY MATRIX LINES (see test instructions)
•
ELECTRICAL SERVICE DIAGNOSTICS – Keyboard test
•
EASY JOG KNOB (see test instructions)
NO
CHECK:
•
IR RECEIVER signal at pin 22 of IC7104 (see test instructions)
•
ELECTRICAL SERVICE DIAGNOSTICS – Remote control test
CL 96532076_020.eps
290799