Goodmans 336NS, Manual

GOODMANS  336NS

Alignments

38.9 Mhz and AFC
Connect a 38.9 Mhz intermediate-frequency
generator to the tuner’s LF output pin 17 and
adjust the core L 4 so as to obtain 4,5 V at pin 9
of TDA 8361/2A.

POWER SUPPLY
Measure the direct voltage at the terminals of
diode DJ1 or D 38 and potentiometer R 162 so
as to obtain a voltage of 105/110 V. (900) 142/
152 V. (110

0

).

AGC
Apply a 60dBuV (+/- 1 dB) RF signal, band III,
channel 10-to-12, and adjust potentiometer R
111 so as to obtain a voltage of about 8V at
tuner pin no. 5 (This voltage depends on the
tuner used, so check on the letter’s characteris-
tics).

WHITE SETTING

ADJUSTMENT WITH ANALOGUE VOLTMETER
•  Power on TV SET
•  Tune to a signal with white screen
•  Contrast control set to minimum
•  Adjust brightness to 2,5 V.D.C. on pin 17 TDA

8361/2A

•  Analogue voltmeter 200 V.D.C. full scale
•  Check for the highest P.T. cathode voltage

than adjust it for 165 V.D.C. via G 2
potentiometer (on E.H.T. transformer)

VERTICAL CENTRING
•  Adjust R 194 (VA) for proper vertical height
•  Adjust R 192 (VL) for proper vertical linearity
•  Cut/solder the R 215 and/or R 216 and/or R

257 in order to obtain the right vertical
geometric centring between CRT and signal
(for example, use a test-pattern signal)

HORIZONTAL CENTRING AND EAST-WEST
CORRECTION (110

0

 ONLY)

•  Adjust R 186 (HC) for proper horizontal

centring

•  Adjust R 205 (HA) for proper horizontal width
•  Adjust R 200 (OW) for proper pin-cushion
•  Adjust R 203 (TZ) for proper trapezium A2

STEREO MODULE

Apply to the TV antenna input connector a TV
signal with audio stereo ( R = 3 KHz L = 1 KHz )
from a generator, or alternatively, tune a TV
channel with stereo transmission. Adjust the coil
L 1 to obtain the maximum level of signal at IC
TDA 9840 pin 5.

Adjustment of VR 1 (stereo dematrixing).

For this adjustment only stereo signal generator
should be used. Connect the scope probe at pin
1 and 3 of TDA 8425. Eliminate modulation tone
of the left channel, adjusting trimmer VP. 1 for
the minimum level signal on the right channel
(pin 1 of TDA 8425 ).

Dual language decoding verifier using a TV
generator in a dual mode or tuning a TV channel

with dual language program, verify the switching
of a language by A/B button on the remote
control and check the relative O.S.D.

NICAM 3 DECODER
•  Apply a Nicam signal to the TV antenna
•  Connect a probe to pin 17 of IC 4
•  Adjust L 3 to obtain the minimum video

modulation

•  Verifier on the pin 39 of IC 1 that there is 2,5 V

DC (use a scope)

•  Check voltages on pin SM 2 and SM 4 on the

connector SM. The amplitude of this voltage
should be 800 mV pp.

•  Check signal on the loudspeaker, should be

20 Vpp with maximum volume

Non Nicam reception
•  Using remote control activate NICAM-OFF

push button

•  Check with a scope the signal on SM 2 and

SM 4 ( SM connector) that should be 800
mVpp

•  Switch the generator from NICAM to stereo

signal

•  Connect a probe on pin 6 of IC 3
•  Adjust the coil L 2 to obtain the maximum level

of signal (54 Khz)

•  Switch off modulation tone 3 Khz, connect a

probe on SM 4 and adjust R 40 for minimum
tone at 1Khz.

•  Connect the modulation tone 3 Khz
•  Verifier on contact SM 2 (left) and SM 4 (right)

(connector SM) that should be 800 mVpp

•  Check signal on loudspeaker, should be 20

Vpp with maximum volume

The End

General Information

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