Toshiba 27A60, Service Manual

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GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
MTS ADJUSTMENT (FOR N0S CHASSIS)
No. ITEM INPUT SIGNAL ADJUSTMENT PROCEDURE
STEREO VCO
(STVC) 1 • No signal 1. Display item STVC, and connect pin 9 of
H002 to ground.
2. Connect frequency counter to pin 12 of
H002.
3. Change data by Volume
s
/
t
buttons so
that the reading of counter becomes value
as close as 4fH (62.936kHz).
SAP VCO
(SAVC) 2 • 78.670kHz 147mVrms
→
pin 9 of H002
• Monaural signal
→
ANT
1. Display item SAVC.
2. Change data by Volume
s
/
t
buttons so
that the data becomes in the center of
range for STA7=0 and STA8=1.
STEREO FILTER
(STRF) 3 • 9.4kHz 600mVrm
→
pin 9 of H002
Monaural signal
→
ANT
1. Display item STRF on screen.
2. Change data by Volume
s
/
t
buttons so
that the data becomes in the center of
range for STA3=1.
SAP FILTER
(SAPF) 4
• 88kHz 110mVrms
→
pin 9 of H002
• Monaural signal
→
ANT
1. Display item SAPF.
2. Change data by Volume
s
/
t
buttons so
that the data becomes in the center of
range for STA4=1.
SAVC
STA7:0 STA8:1
88H
STRF
STA3:1
16H
SAPF
98H
STA4:1
ATTENUATOR
(ATT) 5
• 1kHz 30% mod.
→
ANT
terminal
1. Connect rms meter to pin 12 of H002.
2. Display item ATT on screen.
3. Change data by Volume
s
/
t
buttons so
that output at pin 12 of H002 becomes
value as close as 130mVrms.
STEREO SEPARATION
(WBAN) 6
• STEREO 300Hz R-channel
only
→
ANT
1. Select “STEREO” mode from the MTS
function in the Audio menu.
2. Display item WBAN on screen.
3. Connect oscilloscope to pin 14 of H002.
4. Change data by Volume
s
/
t
buttons so
that 300Hz element on scope becomes
minimum.
• STEREO 3kHz R-channel
only
→
ANT
5. Display item SPEC on screen.
6. Change data by Volume
s
/
t
buttons so
that 3kHz element on scope becomes
minimum.
(SPEC)