Alpine Ai-NET CHA-1214 Service Manual page 18
Compact disc remote changer
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Also See for Ai-NET CHA-1214:
- Owner's manual (10 pages) ,
- Owner's manual (82 pages) ,
- Owner's manual (38 pages)
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CHA-1204
C. Focus Servo Gain Measurement
Measure the focus servo open loop gain in the servo-on (closed loop) condition.
1. Block Diagram
Sample player
Oscillator and oscilloscope
2. Measurement Method using an Oscillator and an Oscilloscope
(a).
(b).
3. Connection (Example)
Connect OSC output to resistor for gain measurement (100 ohms).
(Connect a servo driver side to positive side.)
Connect CH1 of oscilloscope to a servo driver side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Connect CH2 of oscilloscope to MN66271 (IC 101) side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Play back the eighth track of A-BEX TCD-782 disc for
measurement.
(No sound recording track)
Output frequency (1.2 kHz, 150 mVP-P) from OSC
and compare the amplitude of CH1 and CH2 of oscilloscope
and convert into dB.
NOTE:
AC voltmeter is available to measurement.
OSC
Oscilloscope or
AC voltmeter
Common with the
ground of the set
BA6791FP (IC 103)
* FOD: Focus drive output
D. Tracking Servo Gain Measurement
Measure the tracking servo open loop gain in the servo-on (closed loop) condition.
1. Block Diagram
Sample player
Oscillator and oscilloscope
2. Measurement Method using an Oscilloscope
(a).
(b).
(c).
(d).
e).
Connect OSC output to resistor for gain measurement (100 ohms) connection (Esme)
(Connect a servo driver side to positive side.)
Connect CH1 of oscilloscope to a servo driver side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Connect CH2 of oscilloscope to MN66271 (IC 101) side of resistor
for gain measurement (100 ohms).
(Connect negative side with GND of set.)
Play back the eighth track of A-BEX TCD-782 disc for
measurement.
(No sound recording track)
Output frequency (1.2 kHz, 150 mVP-P) from OSC
and compare the amplitude of CH1 and CH2 of oscilloscope
and convert into dB.
NOTE:
AC voltmeter is available to measurement.
OSC
Oscilloscope or
AC voltmeter
Common wth the
ground of he set
BA6791FP (IC 103)
* TRD: Tracking drive output
-~10-—-
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