Notes On Service; Note On Replacement Of Parts; P Rom Ic; Self-Diagnosis - Sony CNU-500 Installation And Maintenance Manual

2-5. Notes on Service

2-6. Self-Diagnosis

2-5. Notes on Service

2-5-1. Note on Replacement of Parts

1. WARNING Safety Related Components Warning
Components marked ! are critical to safe operation.
Therefore, specified parts should be used in the case of
replacement.
2. Standardization of Parts
Some repair parts supplied by Sony differ from those
used for the unit. These are because of parts common-
ality and improvement.
Parts list has the present standardized repair parts.
3. Stock of Parts
Parts marked with "o" at SP(Supply Code) column of
the spare parts list may be not stocked. Therefore, the
delivery date will be delayed.
4. Units Representation
The following represented units are changed or
omitted in writing.
Units
µF
Capacitance
µH
Inductance
Resistance Z
Temperature dC
5. Destination Representation
The part indicated "For J/UC/CE" in the spare parts
list is used in the unit written below.
For J : The part is used in a unit for Japan.
For UC: The part is used in a unit for U.S.A. and
Canada.
For CE : The part is used in a unit for regions except
the above countries.

2-5-2. P ROM IC

Each PROM IC on the PC board has a suffix to its original
designation. This suffix may change according to improve-
ment of IC. Never use and IC having no suffix to its
original designation, because its memory has not been
programmed. Each PROM IC is mounted on the PC board
via socket.
2-4 (E)
Representation
uF
uH
Abbreviation
XXX-DEG-C
2-6. Self-Diagnosis
CNU-500 has a self-diagnosis program. The state of this
unit can be diagnosed by using this self-diagnosis program.

2-6-1. Equipment Required

. 75Ω terminator
. Coaxial cable x 2
. Monitor (A B/W monitor can be used.)
. Signal generator (A VBS(
output.)
* 1 VBS : Video Burst and Sync Signal
*
2 BB : Black Burst and Sycn Signal
. D-SUB 9-pin connector plug (male) whose pins 2 and 3,
and pins 7 and 8 are shorted. (Referred to as a D-SUB 9-
pin short plug hereafter.)
. CCA-5-3 cable or CCA-5-10 cable x 1

2-6-2. Connection

CCU1 CCU2 CCU3 CCU4 CCU5 CCU6
RCP1 RCP2 RCP3 RCP4 RCP5 RCP6
CCA-5-3 or CCA-5-10
Connect between the connectors to be checked using a CCA-5 cable

2-6-3. Initial Setting

Set as described below before performing the self-diagnosis.
. Remove the top panel. (Refer to "2-1, Cabinet Removal".)
Panel switches of AT-100 board
. S1102(OPERATION) → NORMAL
. S3(MODE) → D
. S6(SYNC) → ON
Inside switches on AT-100 board
. S1100(H7) → S1100-2:ON
Except S1100-2:OFF
. S2(H11) → all OFF
* *
1) or BB( 2) signal can be
D-SUB 9-pin
short plug
Monitor
MSU RS232C
VCS AUX
REFERENCE
75Z terminator
VBS or BB
Signal genertor
CNU-500
AC
AC IN