XL-515H (serv.man3) - Sharp Audio Service Manual (repair manual). Page 10

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1. This CD unit need adjustment as follow.

Step 1

VR803 (Focus Offset)

DC + 40 mV (FEI>VRO)

FEI (R826) and VRO
(1-Pin of TP801)

Step 4

VR802 (Tracking Error Balance)

*1 (See Fig. 11-1)

TSO (3-Pin of TP801)
and VRO (1 Pin of TP801)

*1: Adjust to obtaiin vertically symmetrical waveform (Fig. 11-1) with respect toreference DC level. The reference level is VRO

(Approx DC 2.1V).

2. This CD unit have the following automatic adjustment function. Automatic adjustment item.

2-1: Focus Servo Gain (Fig. 11-2)

Focus Gain Adjustment is performed when disc is changed.

2-2: Tracking Servo Gain (Fig. 11-3)

Tracking Gain Adjustment is performed when disc is changed and disc is playbacked.

VR802

VR803

TP801

TRACKING
ERROR
BALANCE

FOCUS
OFFSET

T

S

O

N

C

V

R

O

321

3 2 1

CD SERVO PWB

In order to receive RDS broadcasts, adjust the preset variable resistor as follows.
Adjust the center frequency of the 57 kHz BPF(band-pass filter) using the variable resistor (VR521).

Receiver: Connect the SG output to the aerial terminal.

It is not necessary to connect the speaker output terminal.
Set the frequency display to 98 MHz to tune in the 98 MHz frequency.

IC521

LA2232

C525

0.022

C524

0.01

VR521

4.7k

R521

1k

R523

6.8k

Done

Electric

Voltmeter

Apply 57 kHz, 50mV(ms)
to pin (6) of the input on 
LA2232.

Adjust the variable resistor 
(VR521) until you have the 
maximum value on the 
electric voltmeter.

Adjustment

point

Procedure

57 kHz

oscillator

Frequency

counter

Adjust the 57 kHz

oscillator before 

starting, so that 

the frequency 

counter reads 

57 kHz 

±

 6 Hz.

0.022

input

50mV

B.P.F

T.P

6

5

11