Service manual
3-48 3-49
HD-1
SYS_CLK
VDP_CLK
NTSC_CLK
MAIN_PWM
FR_RATE60
27MHz
System
CPLD
VCXO
27MHz
49FCT
3805
ICS621M
Clock
Buffer
Clock
Synthesis
Control
Output
Buffer
Clock
Buffer
Clock
Synthesis
Control
Output
Buffer
Output
Buffer
ICS501
Clock
OSC
PLL Clock
Multiplayer
& ROM
Output
Buffer
27MHz AC-3 Decoder
Clock
74.175MHz or 81MHz
27MHz
74.175MHz or 81MHz
74LCX
253
S1
S0
81MHz
PSEUDO_60
SELHDCLK
CP_INT/PRG
SEL_HD_CLK
CP_INT/PRG
PSEUDO_60
81MHz
PLD_81M
NT2CLK
5) VIDEO PLL BLOCK DIAGRAM