Sony FH-B7CD - Page 16

Adjustment Location : main board —component side—
CD SECTION
1. Perform adjustments in the order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicat-
SW OSC ed.
VOLTAGE FM TUNED FM DISCRIMINATOR 2 Use the oscilloscope with more than 10MQ impedance.
ADJ — INDICATION LIGHTING | ALIGNMENT
LEVEL ADJ ———
T2,
CT22
aval
IFT82,
TP8I
RF
Level
Check
Procedure :
oscilloscope
(DC range)
TB1
ANTENNA
Sw 1. Connect oscilloscope to test point TP (RF) and TP (VC)
TRACKING pls on BD board.
ADJ 2. Confirm that RF level and eye pattern is optimum.
Oputimum eye pattern means that shape “©” can be
Byes clearly distinguished at the center of the wave form
16 MW(AM)TUNED y & ;
INDICATION LIGHTING
VIDEO/AUX
LEVEL
ADJ
es Sage
E, EA, AUS
PHONO
(AEP, UK, WG, IT)
RF signal Reference Waveform (eye pattern)
LAK AA AAAAAAAA } en
\ HAH i}
WA
XI
E-F Balance Check
Procedure :
oscilloscope
(DC range)
1. Connect test point TP (ADJ) and TP (TES) to ground
TP (OSC) with lead wire.
Connect oscilloscope to test point TP (TE O) and TP
TP (GND) (VC) on BD board.
3. Turn POWER switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical
on the top and bottom in relation to 0V.
6. After check, remove the lead wire connected in step 1.
Note: Take sweep time as long as possible to obtain best
waveform.
A A
OV OV
B B