Sony TRINITRON KV-13VM30 Service Manual page 83

KV-20/13VM30/31
RM-Y138/W
Purpose: To suppress drift in the height relative to the Guide Roller and drift of the X Value after replacing the drum
Test Equipment/ Fixture
Test Equipment
Connection Points
@ Oscilloscope Checking the flatness
@ Post Height Adjusting @CH-1 PB RF Envelope
Driver @ CH-2 (ise : SW30Hz
@ Alignment tape PAL : SW25Hz
@ Blank tape @ Head Switching Output
@ M3 Nut Driver Point
@ RF Envelope Output Point
Connection Diagram
OSCILLOSCOPE
RF SWITCHING
OUTPUT TEST POINT
HEAD SWITCHING ©)
OUTPUT TEST POINT
Checking/ Adjustment Procedure
1) Run the blank tape, check and adjust whether the Roll-
er Guide is curling or creasing tape around the Roller
Guide
Check the RF envelope output flatness and adjust the
Roller Guide Height while playing an alignment tape
Adjust the head switching point
Check that RF envelope output is maximum when the
tracking is at the initial position
Adjust the Tracking Preset and X-Value Adjust with X
Adjust
VCR State Adjustment Points
@ Run the blank tape @ Guide Rollers Precise
@ Play an alignment tape Adjustment
@ Switching point
@ Tracking point
@ X-Value
Waveform Diagram
V/V MAX 3 07
V2/V MAX > 08
RF ENVELOPE OUTPUT
10-11. CHECK OF TAPE TRAVEL AFTER REASSEMBLING DECK ASSEMBLY
Check Audio and RF Locking Time during playback after CUE or REV.
: : Test Equipment
Test Equipment/Fixture pea Point VCR State
@ Oscilloscope @ RF Locking Time :
@ Alignment tape Less than 5 sec.
(with 6H 3kHz Color Bar @ Audio Locking Time
Signal) Less than 10 sec.
@ Stop Watch
Checking Procedure
1
2
3
Change the mode of CUE or REV to play
At this time, confirm that the Locking Time of Audio
and RF Output Waveform fits to specification.
If the results checked above are abnormal, reapeat
adjustments 4 through 8.
@CH-1: PB RE Envelope @ Play an alignment tape
@ CH-2 : Audio Output (with 6H 3kHz Color Bar
@ RF Envelope Output Point Signal)
@ Audio Output Jack