Zenith XBV 443, Service Manual

Page: 12 / 108

3-3
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
• Adjustment And Specification
a) OSCILLOSCOPE b) NTSC MODEL : NTSC SP TEST TAPE
MODE
PLAY
• Adjustment Procedure
a) Insert the SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tr) 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 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
V.Out
H/SW(TP)
R/C TRK JIG KEY 6.5 ± 0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
H/SW
(TP)
OSCILLOSCOPE
CH1 CH2
V.out H/SW
R/C KEY
(TP)
H/SW
Composite
VIDEO
6.5H(412
µ
s)
VCR PART