Vcr Part; Electrical Adjustment Procedures - Zenith ABV341 Series Service Manual

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment
1) PG Adjustment
• Test Equipment
a) OSCILLOSCOPE
b) NTSC MODEL : NTSC SP TEST TAPE
• Adjustment And Specification
MODE
PLAY
• Adjustment Procedure
a) Insert the SP Test Tape and play.
b) Connect the CH1 of the oscilloscope to the H/SW(W861, W862) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(W861, W862), and then check the dis-
tance (time difference), which is from the selected A(B) Head point of the H/SW(W861, W862) signal to
the starting point of the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs).
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the "ATR" is blink after the
SP Test Tape is inserted.
• PG Adjustment Method
a-1) Payback the SP standard tape
b-2) Press the "OK(ENTER)" key on the Remote controller and the "REC" key on the Front Panel the same
time, then it goes in to Tracking initial mode.
c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically.
d-4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data.
• CONNECTION
• WAVEFORM

VCR PART

MEASUREMENT POINT
V.Out
H/SW(W861, W862)
V.Out
H/SW(W861, W862)
H/SW
Composite
VIDEO
ADJUSTMENT POINT
R/C TRK JIG KEY
OSCILLOSCOPE
R/C KEY
6.5H(412µs)
3-3
SPECIFICATION
6.5 ± 0.5H
CH1 CH2
H/SW V.out
(W861, W862)