JMECHA - Sony VCR Service Manual (repair manual). Page 32

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1)

Clean the tape running surface (tape guides, drum, capstan,
pinch roller) referring to Service Manual.

2)

Connect adjustment remote commander (Ref. No. J-13) to the
LANC terminal of the machine.  Set the HOLD switch to ON.

3)

Connect an oscilloscope to the VC-240 board CN009 via the
CPC-8 jig (J-082-388-A).  (in the case of DCR-TRV20).
Scope channel 1: VC-240 board CN009 pin w; (Note)
External trigger:

VC-240 board CN009 pin qj

Connect CN009 pin w; and pin ql (GND) with 75 

Ω

 resistor

(1-247-804-11).

4)

Play the tracking alignment tape (XH2-1)(Ref. No. J-5) back.

5)

Select page: 3, address: 33 and data: 08.  (Note)

6)

Select page: 3, address: 26 and data: 31.  (Note)

7)

Confirm that RF waveform on scope is flat in both entrance
side and exit side.  (Refer to Fig. 4-2 A).
If RF waveform is not flat in entrance side and exit side, perform
the adjustment of section 4-2. and later.  (Refer to Fig. 4-2 B
and C).

8)

When the required conditions of step 7) are satisfied and
adjustment/check are complete, perform [Required work upon
completion of adjustment] as described below.

[Required work upon completion of adjustment]
1)

Connect adjustment remote commander (Ref. No. J-13) to the
LANC terminal of the machine.  Set the HOLD switch to ON.

2)

Select page: 3, address: 26 and data: 00.  (Note)

3)

Select page: 3, address: 33 and data: 00.  (Note)

Page and address numbers differ depending on each model.  Please
refer to Service Manual of respective models.  Those of DCR-TRV20
are described above.

A

B

C