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2-2. Self Diagnosis Function
2-2-1. Outline
When a tape running stops or the VTR enters the power
OFF mode, etc. due to some abnormality, the abnormality
is stored in the EEPROM and displayed on the display
tube.
2-2-2. Storing abnormal modes
¢ The abnormality is classed into 5 groups, and the
abnormality number, system control mode, and the
mechanism position at which the abnormality oc-
curred are stored in the EEPROM.
* The writing timing is just after the abnormality
occurred.
2-2-3. Abnormality mode display
¢ Press the CH UP and CH DOWN buttons on the VTR
simultaneously for more than 5s.
+ And then within 2s, press the STILL button on the
Temote control.
* The system control mode at which the abnormality
occurred is displayed at the channel display area, "E"
is displayed at the hour digit, abnormality generation
number is displayed at the minute digit, and the
mechanism position is displayed in the second digit
position.
* The abnormality mode is displayed regardless of the
power on off.
Abnormal system
Abnormality generation
control modes
number
Abnormal
mechanism positions
« When the Counter Reset button is pressed in the
display period, the abnormality display data is
initialized and "-" is displayed.
2-48
The data displayed are as follows:
Abnormality generation number
Cylinder stop
Reel abnormality (take up)
Reel abnormality (supply)
Abnormat slot in/ slot out
Abnormal loading
Abnormai system control modes
Still, slow playback
2X speed
Stop (moisture condensation)
Reverse playback
Still In reverse playback,
Reverse slow playback
Recording
Record pause
Power off eject
Eject
FAL out
FA down
Loading/unloading
Reverse rotation with pinch roller ON
Playback with pinch roller ON
Stop with main brake ON
FF/REW
Position detection impossible
Positions 0, 2, 4 exist as mechanism positions.
For example, 8 shows a position between 7 and 9
(between playback position and review position).
SECTION 3
SERVICING DIAGRAMS
Ims to be confirmed
TV receive condition,
Logic
Channel select operation,
RF reception
AFC operation level,
Video (EE, REC mode)
EE picture quality,
Audio (EE, REC mode)
Tone signal level
Casette-out
Indicator lamp
Abnormal sound
4, Key Entry Operation
REC, PLAY
Cuc/Review
Still, Frame advance/slow
FF/REW
Indicator jamp
Each mode operation
(Tape drive operation)
Abnormal sound
Remote Control
5. Special Functions
Counter Functions
Digital auto tracking
Each mode operation
Resolution, S/N
Hue, Saturation,
Color unevenness,
Color dropout,
Sound distortion,
Level variation,
Picture noise, Jitter
Picture swing,
Skew distortion,
Flicker, Beat
Video PLAY system
Audio PLAY system
Servo system
Picture Sharpness
Tone Quality
Othres
PLAY
(Test tape: ST-C6, ST-C7)
Cue/Review
Still/Slow
7, REC/PLAY Functions
Resolution, S/N
Video PLAY sysiem
Sound distortion,
Level variation,
Picture noise, Jitter
Picture swing,
Skew distortion,
Flicker, Beat
How to use the table
I. When inspecting a defective VTR, proceed according 10 the steps shown
in the table.
2. Check the items to be confirmed for cach operation step.
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