Service Overview; Self-Diagnosis; Cpu-286 - Sony MSU-750 Maintenance Manual

1-1. Self-Diagnosis

Operation of the switches, LED indicators, and rotary encoders on the control panel can be checked by
the self-diagnosis mode of the unit.
Preparations
1. Press [PANEL|ACTIVE], [PARA], and SCENE FILES [1] switches at the same time.
Operation check
Switch with LED
When the desired switch is pressed, the LED inside the switch lights up. And when the buzzer ON/OFF
switch S6 on the CPU-286 board is in ON position, the buzzer beeps at the same time. To turn off the
LED, press switch again. (Avoid lighting all the switches simultaneously for a relatively long period of
time.)
Indicator
1. Camera number/Tally display block
Make sure that a red and green cross indication moves from the right to left.
Red
Green
2. Make sure that the CARD ACCESS indicator blinks in sequence of red, green then orange.
3. Make sure that the MULTI, TALLY, and PANEL ACTIVE indicators of the camera selector block
blink in sequence of red, green then off.
4. Make sure that the EXT indicator of the IRIS adjusting block blinks.
5. Make sure that the 7-segment LEDs of ECS/SHUTTER, GAMMA, MASTER GAIN, FILTER
display blocks and MASTER BLACK and IRIS adjusting blocks light up in the following order.
1
6 2
7
5 3
8
4
Rotary encoder
When the desired rotary encoder has been turned, the ID number corresponded with the rotary encoder
will be displayed on the IRIS adjusting block, and the control value is displayed on the MASTER
BLACK adjusting block.
Character display block
The ROM version flows from the right to left in this block as a slide-show.
MSU-750 MMP2
Section 1

Service Overview

1-1 (E)