Kenwood DP-1100 B Service Manual page 131

4-2 FOCUS SERVO
DOK ( C N 2 ( D )
The focus servo is
not effective.
J (Unless this is output, the
N O motor does not turn.)
Check the FE signal from
mechanism PCB (pin 8 of CN6).
Check F search at pin 2 of CN2
(2 Hz).
Is LDC - 1 2 V (at pin 3 of CN6)?
Y E S
Check the AGC a m p .
Is the RF amp ok?
Check the slice level control.
Check the comparator.
D P - 1 1 0 0 B II D P - 1 1 0 0 B II
4. TROUBLESHOOTING
F S R C H ( C N 2 © )
T h e p i c k u p
m o v e d u p w a r d s
d o w n w a r d s
1 m m .
N O
r
Check the focus search signal from
the
the signal processing PCB (at pin 2
of J 1 7 1 ) .
Y E S
(IC6 pin 4)
Check to see if MPS is high at pin 15
of IC15.
Check the control logic circuit ( c o m ­
ponents associated with Q 3 2 ) .
lens is
a n d
a t
R 2 4 1 2 0 0 o u t p u t s
<
Is a minus signal applied to
Y E S
the base of transistor and
the gate of the FET in the
FOK cirucit (Q2 and Q6)?
N O
1 r
Check the resistor array, and the
Check IC1 (1/2) and its peripheral
conductor pattern foil.
circuit
Y E S
<
Check the RF a m p .
Check the slice level control.
Check the A G C
* The pickup position should be at inner tracks.