Toshiba 32A32 Service Manual page 14

MTS ADJUSTMENT (FOR N2N, N2F, N2ES CHASSIS)
No. ITEM
1
ATTENUATOR
(ATT)
2
STEREO VCO
(STVC)
3
STEREO FILTER
(STRF)
4
STEREO SEPARATION
(WBAN)
(SPEC)
SAP VCO
5
(SAVC)
INPUT SIGNAL
• 1kHz 30% mod. → ANT
terminal
• No signal
H001
QG01
14
+
CG07
7
+
CG44 RG43
RG44
(1)Jumper wire
• 15.734kHz 30mV(rms) →
Across Point between CG07
and RG44
H001
QG01
14
15.734KHz 30mV(rms)
SL02
+ CG07
(1)
7
+
CG44 RG43
RG44
• STEREO 300Hz (30% mod.)
R-channel only → ANT
• STEREO 3kHz (30% mod.)
R-channel only → ANT
• No signal
H001
(2)
QG01
14
12
1M
CG07
+ +
7
CG44 RG43
(1) Jumper
wire
RG44
– 14 –
ADJUSTMENT PROCEDURE
1. Connect rms meter to pin 34 of QG01.
2. Display item ATT on screen.
3. Change data by VOLUME s/t buttons so
that the reading of meter becomes value
as close as 137mVrms.
1. Short circuit RG44 with a jumper wire.
2. Display item STVC on screen.
3. Connect frequency counter to pin 34 of
QG01.
4. Change data by VOLUME s/t buttons so
that the reading of counter becomes value
as close as 15.73kHz.
5. Remove the short jumper from RG44.
1. Unsolder the solder link SL02.
2. Display item STRF on screen.
3. Connect oscilloscope to pin 34 of QG01.
4. Change data by VOLUME s/t button to
minimize AC output level on scope.
5. Resolder SL02.
1. Display item WBAN on screen.
2. Connect oscilloscope to pin 35 of QG01.
3. Change data by VOLUME s/t buttons so
that 300Hz element on scope becomes
minimum.
1. Display item SPEC on screen.
2. Connect oscilloscope to pin 35 of QG01.
3. Change data by VOLUME s/t buttons so
that 3KHz element on scope becomes
minimum.
1. Shortcircuit RG44 with a short jumper.
2. Connect 1Mohm resistor between pin 12 of
QG01 and ground.
3. Display item SAVC on screen.
4. Connect frequency counter to pin 34 of
QG01.
5. Change data by VOLUME s/t buttons so
that the reading of counter becomes value
as close as 78.67kHz.
6. Remove the short jumper and 1M ohm
resistor.