Sanyo VM-EX70P Adjustment Manual

DFGINOUTDPGINOUT3 0 DEGT lT l ( ms )N TSC 2.8PAL 3.3T2 ( ms )33.440.07-3-2. RF SW Signal Generation360 DEGT2fl ( Hz ) f2 ( Hz )3 6 0 30300 25The RF SW signal, which is a signal for switching betweenthe two heads, is generated based on the DFG and DPG.[ Switching point adjustment]The signal recording position on the tape is determined bythe switching timing of the RF SW signal. The RF SW signalis generated by d ividing the DFG by 1 2. Its polarityalternates according to the pattern Hi-Low-Hi for each 1 80degrees of rotation.There is a variable delay circuit for correcting the deviationof the switchi ng timing due to variations in the DFGmounting positions.The amount of delay can be adjusted by means of the ADinput to Pin @ of CXP80724.(A) RF SW(B) REC CHA(C) REC CHB(D) SEL 1(REC)(E) SEL 2(REC)(F) JOG VD(CU E OR REV)__JFig. 7-1 .IC3 8 1L B 1 8 8 5@) } 1 2 PU LSE/REV. (360 ° )@---- @....____ @DEG : DegreeThe RF SW signal is output from Pin @ of CXP80724. Theswitching point is adjusted by playing back a properlyrecorded alignment tape to adjust the RF SW timing, andadjusting by means of VR351 .[Video signal recording phase (7H) setting]During recording, the vertical sync pulse is recorded ontothe tape in a specified position (7H after the RF SW sign alswitching point).[Video control signal]Various signals are generated by CXP80724 based on theRF SW signal and are output, and these signals are used tocontrol the video circuits. Fig. 7-2. shows the waveforms ofthese various signals.CXP80724(90) OUT(1 ) OUT(1 00) OUT(90) OUTL (96) OUT(93) OUTJOG VD: Quasi vertical sync signalFig. 7-2.- 4-43 -