Marantz DR2100 Service Manual page 22

8.1.3 Display board troubleshooting guide
SWITCH POWER ON,
EXIT STAND BY
MODE
DISPLAY?
YES
FUNCTIONS?
YES
REMOTE
CONTROL?
YES
FRONT, MAIN u-COM BOARD
NO
NO
KEY
NO
OK
Figure 8-4 Display board troubleshooting'
CHECK :
SUPPLY VOLTAGES
+5V 5 % at conn. JU04-1
CLOCK SIGNAL
8Mhz at pins 82, 83 of QU01
CONTROL SIGNALS
RESET IN 3V3 (high) at conn. JU02-4 after start up
I2C DATA at conn. JY01-5
I2C CLK at conn. JY01-7
ELECTRICAL SERVICE DIAGNOSTICS - Local display test
CHECK:
KEY LINES
ELECTRICAL SERVICE DIAGNOSTICS – Keyboard test
EASY JOG KNOB
CHECK:
IR RECEIVER signal at pin 63 of QU01
ELECTRICAL SERVICE DIAGNOSTICS – Remote control t e st
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