Kenwood Ez700SR Service Manual page 20

Ez700SR/Ez900HDS
Calibration on the Fan Operation Temperature
1. Objective
In order to reduce the soiling of the CD mechanism pick, the
fan operation has been made intermittent-type, driven by tem-
perature monitoring. Due to variances among parts, however,
the operating temperature of fan also varies. Adjustments are
needed, therefore, in terms of the temperature calibration.
2. Subject parts with variances
TH1 posistor
IC205 Power IC
Q202 transistor
3. Adjustment timing and method
• When conducting the adjustment, the ambient temperature
should be15~30°C.
• The sets to be adjusted should be left in the temperature
range for some time, in order to make the temperature of
the sets fall within the temperature range.
• Refer to the table below for adjustment method.
Conditions for Adjustment Method
Adjustment
At the time of 1. Boot in the test
replacing parts mode.
on Item 2. 2. Select SIRIUS
source
3. Long-push Preset (Less than a minute)
"1" key.
20
ADJUSTMENT
Note
Conduct adjustment
as quickly as
possible after
turning power on.
Note1)
Note1) If and when there is more than a minute after turning
the power is turned on a set, wait till the heat sink on the back
cools or cool the heat sink using a fan. (Cool to temperature
below 30°C. Until slight coolness can be felt on your hand.)
Then, restart adjustment. Also, when replacing TH1 posistor,
wait till this part cools. (Rule of thumb is about 10 minutes.)
When finding out that a wrong adjustment action has been
taken, adjust again following the above (2) and (3) procedures.