Board; Chapter 7 Appendix; Self-Diagnostic Function -S+Sssssesssosssessenssee E7-1 - Hitachi DIGITAL 8 VM-D965LE Service Manual

CHAPTER 7 APPENDIX
1. SELF-DIAGNOSTIC FUNCTION
1.1 Overview
The camera/recorder has the following self-diagnostic function.
® Occasional defect self-diagnostic function (A mode)
@ Mechanical block self-diagnostic function (B mode)
Fig. 1-1 shows the self-diagnostic coverage range.
The self-diagnostic functions of the camera/recorder are engaged by the 8mm system control uP (ICO0901) which detects,
memorizes and displays data related to defects in the mechanical block control system.
CIRCUIT
BOARD
PROCESS CIRCUIT
SELF-DIAGNOSIS COVER RENGE &
TROUBLE 8mm SYSTEM : SERVO
SENSOR CONTROL CIRCUIT H CIRCUIT
VIDEO SIGNAL
eee
-
PROCESS CIRCUIT
a
DV
MIC UNIT
IL, AUDIO SIGNAL
LOD, UNL $30 CFG
LOADING CYLINDER CAPSTAN
TAKE-UP
END
SENSOR
RSS
STG
SUPPLY
CASSETTE
REEL
HOLDER
SENSOR
SW
RST EJT, UST, REW,
END LED pee LST, FWD, HEC
EEL
SENSOR MODE SW
Fig. 1-1 Self-Diagnostic Coverage Range