Marantz CDR500 F1B Service Manual page 21

8.1.3 Display board troubleshooting guide
SWITCH POWER ON,
EXIT STAND BY
MODE
DISPLAY?
YES
FUNCTIONS?
YES
REMOTE
CONTROL?
YES
DISPLAY BOARD
NO
NO
KEY
NO
OK
Figure 8-9 Display board troubleshooting'
CHECK :
SUPPLY VOLTAGES
-34V ± 5 % at conn. JY01-2
±
4V1 10% bet ween conn. JY01-1 and JY01-3
±
+5V 5 % at conn. JY01-10
CLOCK SIGNAL
8Mhz at pins 8, 9 of QY01
CONTROL SIGNALS
RESETN 3V3 (high) at conn. JY01-4 after start up
I2C DATA at conn. JY01-5
I2C CLK at conn. JY01-7
FTD DRIVE LINES
Filament voltage 4V1
pins 1(2)-52(53) of the FTD (VX01)
Grid lines (see test instructions)
Segment lines (see test instructions)
ELECTRICAL SERVICE DIAGNOSTICS - Local display test
CHECK:
KEY MATRIX LINES (see test instructions)
ELECTRICAL SERVICE DIAGNOSTICS – Keyboard test
EASY JOG KNOB (see test instructions)
CHECK:
IR RECEIVER signal at pin 22 of QY01 ( see test instructions)
ELECTRICAL SERVICE DIAGNOSTICS – Remote control test
1-19
± 10% between pins 1-3 and