LOEWE 59515 Instruction Manual

DECK MECHANISM ADJUSTMENT
4.Guide Roller Height Adjustment
Purpose: To regulate the height of the tape so that the bottom of the tape runs along the
tape guide line on the Lower Drum.
4-1. Preliminary Adjustment
Test Equipment/ FixtureTest Conditions (Mechanism Condition)Adjustment Point
Y Post Height Adjusting DriverY Play or Review ModeY Guide Roller Height Adjustment
screws on the Supply and Take-Up
Guide Rollers.
Adjustment Procedure
ADJUSTMENT DIAGRAMGuide Roller Height
1) Confirm if the tape runs along the tape guide line of theAdjustment screw
Lower Drum.
2) If the tape runs the bottom of the guide line, turn theUpper Flange
Guide Roller Height Adjustment Screw to clockwise
direction.
Guide Roller
3) If it runs the top, turn to counterclockwise direction.
Retaining Screw
4) Adjust the height of the Guide Roller to be guided to the
guide line of the Lower Drum from the starting and end-
Fig. C-4-1
ing point of the Drum.
4-2. Precise Adjustment
Test Equipment/FixtureTest Equipment Connection PointsTest Conditions VCR(VCP) StateAdjustment Point
Y OscilloscopeY CH-1:PB RF EnvelopeY Play an Alignment TapeY Guide Roller Height
Y Alignment TapeY CH-2:NTSC: SW 30HzAdjustment Screws
Y Post Height AdjustingPAL: SW 25Hz
DriverY Head Switching OutputWaveform Diagrams
Point
P2 POST
Y RF Envelope Output
ADJUSTMENT
Point
Adjustment Procedure
1) Play an Alignment Tape after connecting the probe of the
Oscilloscope to the RF Envelope Output Test Point and
Head Switching Output Test Point.
2) Tracking Control(in PB Mode) : Center Position(WhenTurn the Roller Guide Height
P3 POST
Adjustment Screw slightly
this adjustment is performed after the Drum AssemblyADJUSTMENT
to flatten the waveform.
has been replaced, set the Tracking Control so that the
RF Output is Maximum).Fig. C-4-2
3) Height Adjustment Screw : Flatten the RF waveform.
(Fig. C-4-2)
4) Turn(Move) the Tracking Control(in PB Mode) clockwise
and counterclockwise.(Fig. C-4-3)Turn(Move) the Tracking
Tracking Control at center
5) Check that any drop of RF Output is uniform at the startControl to both directions
and end of the waveform.
Fig. C-4-3
NOTEConnection Diagram
OSCILLOSCOPE
If the adjustment is excessive or insufficient the tape will
jam or fold.
RF ENVELOPE OUTPUT TEST POINT
HEAD SWITCHING OUTPUT TEST
POINT
4-15