Pioneer PL-L70 Service Manual page 55

The band detector doesn't
work during tracing
Is it a special type of record listed below?
YES
Recheck it with a regular record
Perform error checks on S16, R12, R22
and R41 to 43 and check the patterns
around those areas
When the sensor sensitivity is changed | NO
does the voltage of Q6 pins 8 and 10
(pin 10 as reference) change as shown
below? (+5V as reference)
H N L
approximate- —0.9 —1.3V
ly —0.6
Perform error checks on R23 and Q11,
and check the patterns around those
areas
Readjust the band sensor offset VR3
Readjust the band sensor gain VR1, 2
The band detector doesn't
work in the UP mode
Is it a special type of record listed below?
NO
Is it the same when the sensor sentivity
is changed?
YES
Recheck it with a regular record
Change the sensitivity and recheck
When the sensor sensitivity is changed
does the voitage of O6 pins 8 and 10
(pin 10 as reference) change as shown
below? (+5V as reference)
Perform error checks on S16, R12 and
H N L R41 to R43, then check the patterns in
i those areas
approximate- —0.6V —0.8V
ly —0.4V
YES
NO} Check the stylus height. It should be
6mm above the surface of the record +
imm
Readjust the stylus
heigh Special types of records
eight
e@ Color records
Picture records
e
@ Records with extremely narrow bistds
e Records with extremely jagged sosnd
Readjust the band sensor offset VR3 grooves
e@ €xtremely dirty or scratched recy rds
Readjust the band sonsor gain VR1, 2
71