BD-HP22SB
4 – 8
4. ETHER UNIT
A button fails to work.
Is the button switch contact and tightness as specified?
YES
YES
Check the line between each button and IC2504. Or check the
pull-up resistor at pin (74) or (75) of IC2504. (R2578, R2507)
Is the control voltage properly applied at pin (74) (KEY_EJCT)
and pin (75) (KEY_STBY) of IC2504? (While the relevant
button is held down, the "H" level changes to "L" level.)
NO
Check the relevant switch. Replace it as required.
NO
Check IC2504 and its peripheral circuits. Or replace IC2504
as required.
FLOW CHART No.6
Internet connection impossible with Ether terminal.
Still malfunctioning even by replacing the cable.
NO
YES
Is any signal input into pins (1)/(2)/(4)/(5) of the J7001?
Check the J7001 contact.
Cable defective.
YES
NO
Is any signal input into pins (28)/(29)/(31)/(32) of the IC7001?
Check the peripheral circuits of J7001.
YES
Check or replace the peripheral circuits of X7001 and R7024.
NO
Check the peripheral circuits of FB7001, FB9004 and IC9002.
NO
YES
Is 50MHz clock detected at pin (14) of IC7001?
Is 3.3V supplied to pins (7)/(25)/(30)/(33)/(35) of IC7001?
YES
Check or replace the peripheral circuits of IC7201.
YES
Is any signal input into the R7004 - 7012?
YES
Check or replace the peripheral circuits of IC7001.
NO
Is 50MHz clock detected of R7027?
NO
Check or replace the peripheral circuits of IC7201.
YES
FLOW CHART No.1
Summary of Contents for BD-HP22SB
Page 46: ...BD HP22SB 7 15 MEMO ...
