Toshiba 27A60 Service Manual page 15

MTS ADJUSTMENT (FOR N0S CHASSIS)
No. ITEM
1 STEREO VCO
(STVC)
2 SAP VCO
(SAVC)
3 STEREO FILTER
(STRF)
4 SAP FILTER
(SAPF)
5 ATTENUATOR
(ATT)
6 STEREO SEPARATION
(WBAN)
(SPEC)
INPUT SIGNAL
• No signal
• 78.670kHz 147mVrms
→ pin 9 of H002
• Monaural signal → ANT
• 9.4kHz 600mVrm
→ pin 9 of H002
Monaural signal → ANT
• 88kHz 110mVrms
→ pin 9 of H002
• Monaural signal → ANT
• 1kHz 30% mod. → ANT
terminal
• STEREO 300Hz R-channel
only → ANT
• STEREO 3kHz R-channel
only → ANT
– 14 –
ADJUSTMENT PROCEDURE
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).
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.
SAVC
88H
STA7:0 STA8:1
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.
STRF
16H
STA3:1
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.
SAPF
98H
STA4:1
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.
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.
5. Display item SPEC on screen.
6. Change data by Volume s/t buttons so
that 3kHz element on scope becomes
minimum.