Trouble Shooting - Sony DNE-1000 Maintenance Manual

4-2. Trouble Shooting

4-2. Trouble Shooting
In the self diagnostics tests, the trouble that will erupt and
the source's research are described.
1. Trouble When Starting Self Diagnostics
The self diagnostics does not start.
. BKNE-1011 is not attached.
2. Trouble When Testing RAM
The internal RAM's error.
. The IC27 on the CPU-206 board is at fault.
The external RAM's error.
. Any of the IC19, IC21 and IC28 on the CPU-206 board
are at fault.
3. Trouble When Testing LED
The [P] [P] [P] [P] or [TL] [P] [TL] [TL] [TL] key (BKNE-1010) does not light or [TL]
does not light off.
. The IC24 on the CPU-206 board is at fault or is a cold
joint.
. The Q5 ([P] key) or Q4 ([TL] key) on the CPU-206
board is at fault or is a cold joint.
. The CN4 on the CPU-206 board is a cold joint.
. The harness (KEY1) between CN4 on the CPU-206
board and CN2 on the KY-343 board is not connected or
is a poor connection.
4-8 (E)
Any of the "1", "2", "3", "4", "M", "KNOB",
"LEVER", "INPUT", "MIX", "1/2", "3/4" and "L/R"
LEDs (BKNE-1011) do not light or do not light off.
. The IC1 or IC27 on the CPU-206 board is at fault or is
cold joints.
. The CN1 on the CPU-206 board is a cold joint.
. The CN1 or CN9 on the CPU-207 board is a cold joint.
. The IC6 on the CPU-207 board is at fault or is a cold
joint.
. The CN1 on the LD-77 board is a cold joint.
. The IC1 on the LD-77 board is at fault or is a cold joint.
. Any of the D1 through D12 on the LD-77 board are at
faults or are cold joints.
The "AUDIO LEVEL METER L or R" LED does not
light or does not light off.
. Any of the IC6, IC8 and IC27 on the CPU-206 board are
at fault or are cold joints.
. The CN1 on the CPU-206 board is a cold joint.
. The CN1 on the CPU-207 board is a cold joint.
. Any of the IC8, IC11 through 15, IC17 through 20, IC22
through 24, IC27, IC28, IC31, IC32 and IC56 on the
CPU-207 board are at fault or are cold joints.
. The CN9 on the CPU-207 board is a cold joint.
. The harness between CN9 on the CPU-207 board and
CN1 on the LD-77 board is not connected or is a poor
connection.
. Any of IC2 through IC5 on the LD-77 board are at fault
or are cold joints.
. Any of D13 through D62 on the LD-77 board are at fault
or are cold joints.
DNE-1000