Hitachi VT-FX685A, Service Manual, Page: 32 / 67

SYSTEM CONTROL TIMING CHARTS
Mode SW : LD-SW
LD-SW Position detection
A/D Input voltage Limit
(Calculated voltage)
Symbol
3.76V~4.50V
(4.12V)
EJ
4.51V~5.00V
(5.00V)
CL
0.00V~0.25V
(0.00V)
SB
1.06V~1.50V
(1.21V)
TL
0.66V~1.05V
(0.91V)
FB
1.99V~2.60V
(2.17V)
SF
1.51V~1.98V
(1.80V)
AU
3.20V~3.75V
(3.40V)
AL
0.26V~0.65V
(0.44V)
SS
4.51V~5.00V
(5.00V)
GC
2.61V~3.19V
(2.97V)
RS
EJ RS : Loading FWD (LM-FWD "H", LM-REV "L")
RS EJ : Loading REV (LM-FWD "L", LM-REV "H")
Stop (A) = Loading
Stop (B) = Unloading
Note :
Symbol Loading Status
EJ Eject
CL Eject ~ REW Reel
SB REW Reel ~ Stop(B)
TL Stop(B) ~ Brake Cancel
FB Brake Cancel
SF ~ Stop(A)
AU Stop(A) ~ Play / REC
AL Play / REC ~ Still / Slow
SS Still / Slow ~ Capstan Reversal
GC Capstan Reversal ~ RS (REW Search)
RS RS (REW Search)
Note:
1-11-1
13 RF-SW
F-AD
(Internal Signal)
5 C-DRIVE
37 PB CTL
10 C-F/R
11 H-A-SW
12 ROTA
AT
"H"
"Z"
"H"
"L" "L"
ST
BL
STILL FRAME ADVANCE STILL
The first rise of RF-SW after a rise in F-AD signal
Stop detection (T2)
Slow Tracking Value
Acceleration Detection (T1)
Reversal Limit Value
Fig.1
1-11-2