Camera Picture Faulty; Faulty Of Playback Picture - Canon ELURA10 A Service Manual

7-2 Camera Picture Faulty

<Hints>
A flow of camera picture (EE) is as below.
CCD → CA P.C.B. → MAIN P.C.B. (DIC4 → SIC → VIC2→VIF2) → JACK P.C.B.
<Check Points>
1) Lens Resetting (P. 3-8)
If the camera picture is not displayed, check it in the service mode. If NG, check the lens.
2) Blue Back Output
In the VCR mode, the blue-back signal is generated by the VIC2 mounted on the MAIN P.C.B. Therefore, if its normal output can
be confirmed, it can be judged that the signal line subsequent to the VIC2 are normal.
3) Check of white 100% or color bar (DIC 4) output (P. 3-7)
The white 100% or color bar (DIC 4) signal is generated by the DIC4 mounted on the MAIN P.C.B. In the service mode, check
whether the white 100% or corol bar signal is generated normally or not. If its output is normal, the signal line subsequent to the
DIC4 would be normal.
4) CCD Output
The CCD output signal is sampled by the CDS/AGC/AD IC. Check this signal condition.
5) Camera Special Command (P. 3-7)
Check the operations of White Balance, AGC, IRIS, etc. in the SERVICE mode.

7-3 Faulty of Playback Picture

<Hints>
In DV format, the deterioration of picture quality appears on the screen as a block noise. This failure is occurred when the picture
information (in block unit) exceeds a limit of processing performance of error correction and the previous picture information is used
for compensation.
Normally, if an error rate is worsened considerably by the deterioration of tape quality or head output, the symptom appears.
For this reason, when you check the playback picture, check the error rate. To evaluate the error rate at an absolute value, use several
kinds of tapes.
<Check Points>
1) Deterioration of Tape Quality
Check if flaws, kinks, etc. are found on a magnetic face of tape or not, and compare it with the error rate of other unit.
2) Error Rate (P. 3-5)
Check an error rate of self-recording LP playbacked picture in the SERVICE mode.
If the result is "NG" check the following points.
3) Head Output (See the DMC II Service Manual.)
Referring to a service manual of DMC II, check the RF output level and linearity. (including a cleaning of head)
The relation between the RF envelope and the faulty symptom is as below.
· Lack of output at inlet side
· Lack of output at outlet side : abnormal time code, etc., right part of screen has a block noise.
4) EQ Automatic Adjustment (P. 4-36)
Referring to the adjustment procedures, perform the EQ automatic adjustment. By this adjustment, the Playback Amplifier circuit
in theVRP2 (on the MAIN P.C.B.) and the playback RF output are matched so that the error rate is minimized automatically.
CAHPTER 3. INFORMATION FOR REPAIR · SERVICE HINTS
: abnormal sound, left part of screen has a block noise.
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ELURA20 MC A, ELURA10 A