Toshiba 27A50, Service Manual

Page: 14 / 55

– 14 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
MTS ADJUSTMENT (FOR N5ES/N7S CHASSIS)
No. ITEM INPUT SIGNAL ADJUSTMENT PROCEDURE
ATTENUATOR
(ATT) 1
• 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 142mVrms.
STEREO VCO
(STVC) 2
• 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) 3 • 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) 4 • 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) 5
• 88kHz 120mVrms
→
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.
STEREO SEPARATION
(WBAN) 6
• STEREO 300Hz R-channel
only
→
ANT
1. Select “STEREO” mode from the MTS func-
tion 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 mini-
mum.
• 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 mini-
mum.
(SPEC)
SAVC
STA7:0 STA8:1
XXH
STRF
STA3:1
XXH
SAPF
XXH
STA4:1