Servo Adjustment; Vcr Part; Electrical Adjustment Procedures - Zenith XBV613 - DVD/VCR Combination Service Manual

ELECTRICAL ADJUSTMENT PROCEDURES

1. Servo Adjustment

1) PG Adjustment
• Test Equipment
a) OSCILLOSCOPE
• Adjustment And Specification
MODE
PLAY
• Adjustment Procedure
a) Insert the SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the "ATR" is blink after the
SP Test Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(TP) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(TP) and then check the distance (time
difference), which is from the selected A(B) Head point of the H/SW(TP) signal to the starting point of
the vertical synchronized signal, to 6.5H ± 0.5H (412µs, 1H=63µs).
• 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 PG adjusts automatically.
d-4) Stop the playback, PG adjustment is finished.
• CONNECTION
• WAVEFORM

VCR PART

MEASUREMENT POINT
V.Out
H/SW(TP)
V.Out
H/SW
(TP)
H/SW
Composite
VIDEO
b) NTSC MODEL : NTSC SP TEST TAPE
ADJUSTMENT POINT
R/C TRK JIG KEY
OSCILLOSCOPE
R/C KEY
6.5H(412µs)
3-2
SPECIFICATION
6.5 ± 0.5H
CH1 CH2
H/SW V.out
(TP)