Pioneer tuning fork Service Manual page 45

Capstan FG
Control Head PB
REC
Video Input
V sync.
Sep.
(ft VHS)
3.58MHz
X'tal OSC
Video Head
LPF
(8mm)
10. A l i g n m e n t of T a p e Transport M e c h a n i s m
The tape transport mechanism should correctly be aligned,
or the VCR interchangeability will be lost. The height of
Tape-guide-poles can be adjusted observing R F signal am­
plitude on an oscilloscope.
SP/LP/EP
Divider
REC
PB (8mm: Fixed to REC)
1/2
30Hz
Tracking
Divider
M M V
Tracking VR
MIX
Pilot signal
Gen.
Fig. 2 9 Block Diagram of Capstan Servo Circuit
Speed
Det.
Phase
Comp.
REC
PB(#
PB
REC(VHS)
(8mm)
16kHz
BPF
46kHz
BPF
If the distance between D r u m and CTL-head of the play­
er is not equal to that of the recorder, the reproduced V-
sync will be out of phase from the C T L signal, and servo
control will become difficult.
Tracking-VR, has been employed for compensating the
phase error caused by the distance error.
Motor
M
Drive
Capstan Motor
REC
PB (0, V H S : Fixed to REC)
A varialble resistor,
43