Philips AZ 3013/00, Service Manual

6 - 2

6 - 2

TUNER BOARD - LAYOUT DIAGRAM

VARICAP  ALIGNMENT

FM RF

FM IF

AM IF

AM RF 

108MHz

87.5MHz

87.5MHz

87.5MHz

L303

check

4V –0.2V

0.9V –0.2V

1494kHz

558kHz

560kHz

1500kHz

1494kHz

558kHz

558kHz

560kHz

(or 560kHz)

1500kHz

TC302

MW ferrite coil

MW ferrite coil

TC302

MAX

FM 
   87.5 - 108MHz

1700kHz

530kHz

T301

check

3.4V - 3.5V

0.6V - 0.7V

1602kHz

531kHz

T301

check

3.6V - 3.7V

0.6V - 0.7V

108MHz

108MHz

L302

MW

FM/AM-version, 10kHz grid

   530 - 1700kHz

MW

450kHz

4

1

4

4

A

FM

mod=1kHz

∆

f=–22.5kHz

1)

If sensitivity of frequency counter is too low adjust to max. channel separation

    (input signal: stereo left 90% + 9%, adjust output on right channel to minimum)

Repeat

ECO6, general with ferrite antenna,  070799

TUNER ADJUSTMENT TABLE 

∆

f=–10kHz

V

RF

 = 0.5mV

C

max.

symmetric

f

o

T301

MW

FM/MW-version, 9kHz grid

  531 - 1602kHz

B

∆

f = –30kHz

V

RF

 as low as

possible

max.

symmetric

f

o

MW

FM/AM-version, 10kHz grid

  530 - 1700kHz

2)

RC network serves for damping the IF-filter while adjusting the other one.

Waverange

Input frequency

Input

Tuned to

Adjust

Output

Scope/Voltmeter

FM 
   87.5 - 108MHz

FM/MW-version, 9kHz grid

   531 - 1602kHz

(as low as

possible)