3-4
VCC (3.3V)
VHALF (1.65V)
VREF2 (2.1V)
36 PIN
29 PIN
27 PIN
IC202
RF IC
(AN8703)
1) There are two kinds of reference voltage on RF
IC
2) These are outputed from RF IC and 1.65V is
used as reference of DSP IC 2.1V is used as
reference of Pick - up
If these reference voltage don’t appear, All kinds of
servo control will fail.
So, should be checked first of all Check the RF IC
and replace…
VCC
3.3V
1.65V
2.1V
Power
Cord in
VHALF
VREF2
Pick-Up
TDO
A/B/C/D
TE
Reference
2.1V
Reference
1.65V
Reference
1.65V
IC201
DSP
(MN103S)
IC203
Motor
Drive
IC202
RF IC
We can see how the reference voltage,
mentioned previous page, will work on servo
control..
1) The DC level of RF signal from P/up is 2.1V
2) The DC level of TE and TDO is 1.65V
3) Correct DC level of these signal make servo
work normally.
Even though, the reference voltage come out
correctly from RF IC,
If A/B/C/D are not biased by 2.1V, and checking
the P/up is needed.
If the DC level of TE is not 1.65V, check RF IC
and replace it…
In case of TDO, procedure is same
TE
1.65V
120mV
TDO
A/B/C/D
1.65V
2.1V
5. Reference Voltage 1
6. Reference Voltage 2
