Sony CNU-500 Maintenance Manual page 22

2-6. Self-Diagnosis
2. Disconnect the CCA-5 cable (that connects between
the MSU and RCP1 connectors) at the RCP1 connec-
tor, then connect it to the AUX connector. Set S5
switch (on the board panel) to the SET position and
release S5 switch when the MSU ↔ AUX display
appears on the monitor screen. (See in Fig. 9.)
AT-100 Com. check mode.
MSU RCP1 OK
CCU1 RCP2 NG
CCU2 RCP3 NG
CCU3 RCP4 NG
CCU4 RCP5
NG
CCU5 RCP6 NG
CCU6 VCS NG
MSU AUX OK
Trouble 9 : The MSU ↔ AUX display is NG.
Remedy : Confirm if IC1003 and its peripheral
block are not defective.
Trouble 10 : A CCA-5 cable is connected, but MSU
↔ RCP1 to MSU ↔ AUX all appear as
an NG display.
Remedy : Confirm if IC1200, IC1201, and IC1203
and their peripheral block are not defec-
tive.
2-8
(AUTO)
S10 1
Fig. 9
3. After Fig. 9 is displayed, the display shown in Fig. 10
appears in a short time. (The self-diagnosis is then
terminated.)
AT-100 Com. check mode.
MSU RCP1 OK
CCU1 RCP2 NG
CCU2 RCP3 NG
CCU3 RCP4 NG
CCU4 RCP5 NG
CCU5 RCP6 NG
CCU6 VCS NG
MSU AUX OK
Fig. 10
Trouble 11 : A D-SUB 9-pin short plug is connected,
but S101 appears as an NG display.
Remedy : Confirm if IC1105, IC1112, IC1101, and
IC1102, and their peripheral block are not
defective.
2-6-5. Switch Setting After Completion of
Self-Diagnosis
Perform the following switch settings after completion of
the self-diagnosis.
• POWER SWITCH (front panel) → OFF
Panel switches of AT-100 board
• S1102 (OPERATION) → NORMAL
• S3 (MODE) → 0
• S6 (SYNC) → ON
Inside switches on AT-100 board
• S1100 (H7) → S1100-2: ON
Except S1100-2: OFF
(For NTSC Model)
• S2 (H11) → All OFF
(For PAL Model)
• S2 (H11) → S2-1: ON
Except S2-1: OFF
After switch resetting, attach the top panel in the reverse
order of removal.
(AUTO)
S10 1 OK
Check end [Please Reset]
CNU-500