Kenwood DP-1100 B Service Manual page 134

4-7. TRAY
The tray feed is not
effective.
NO
Check the remote control
Check the microprocessor
(Refer to the description of IC15)
(the state of mode 0 to 4)
4-9. SLICE LEVEL CONTROL
(D.S.V)
The slice level con
trol is not effective.
•Note: The AGC circuit makes the input level to the RF amp constant
when the input level has changed due to the variation in disc
speed or scratches on the disc.
Note: The slice level control circuit eliminates the DC component in
the EFM wave.
1 3 8
• P - 1 1 0 0 B II D P H O O B II
4. TROUBLESHOOTING
u OPEN ( + 9 V)
CLOSE ( - 9 V)
Check the drive transistors IQ15 and
Q16). Check the microprocessor
mode. Check the values.
Check the limit switch for open or
close.
circuit.
m o d e .
YES
Check the auto slice level control
a m p (IC8).
(pins 28 and 29 of IC15 Servo
PCB)
E F M
disc
ches)
4-8. A G C
The A G C is not ef
fective.
Refer to focus servo.
(When the
has scrat­
G A T E V O L T A G E
Check the peak detection amp (IC8)
Check the Q33
for AGC.