Goodmans 336NS, Manual

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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
Also Covers
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