-76-
• CH-1: PB RF Envelope
• CH-2: NTSC: SW 30Hz
PAL: SW 25Hz
• Head Switching Output
Test Point
• RF Envelope Output Test Point
Test Equipment/ Fixture
• Oscilloscope
• Alignment tapes(with 6H
3kHz Color Bar Signal)
• Stop Watch
VCR(VCP) State
• Run the CUE, REV play mode at the
beginning and the end of the tape.
Test Equipment
Connection Points
• CH-1: PB RF Envelope
• CH-2: Audio Output
• RF Envelope Output Point
• Audio Output Jack
DECK MECHANISM ADJUSTMENT
Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.
8-2.Check for tape curling or jamming
Test Conditions (Mechanism Condition)
1) Confirm that the tape runs smoothly around the roller
guides, drum and A/C head assemblies while abruptly
changing operating modes from Play to CUE or REV.
This is to be checked at the begining, middle and end
sections of the cassette.
2) Confirm that the tape passes over the A/C head
assembly as indicated by proper audio reproduction
and proper tape counter performance.
Checking Procedure
7. Adjustment after Replacing Drum Assembly (Video Heads)
Test Equipment/ Fixture
• Oscilloscope
• Alignment tapes
• Blank Tape
• Post Height Adjusting Driver
• Screw ) Type 5mm
Connection Point
Test Conditions
(Mechanism Condition)
• Play the blank tape
• Play an alignment tape
Adjustment Points
• Guide Roller Precise
Adjustment
• Switching Point
• Tracking Preset
• X-Value
Checking/Adjustment Procedure
Play a blank tape and check for tape curling or creasing
around the roller guide. If there is a problem then follow the
procedure 4. "Guide Roller Height" and 5. "Audio Control(A/C)
Head Adjustment".
RF ENVELOPE OUTPUT TEST POINT
OSCILLOSCOPE
HEAD SWITCHING OUTPUT TEST
POINT
Connection Diagram
Waveform
Fig. C-7
8. Check the Tape Travel after Reassembling Deck Assembly.
8-1.Check Audio and RF Locking Time during playback and after CUE or REV (FF/REW)
Specification
• RF Locking Time: Less than 5
sec.
• Audio Locking Time:Less than
10sec
Test Conditions
(Mechanism Condition)
• Play an alignment tape
(with 6H 3kHz Color Bar
Signal)
Checking Procedure
Play an alignment tape then change the operating mode to
CUE or REV and confirm if the unit meets the above listed
specifications.
1) CUE is fast forward mode (FF)
2) REV is the rewind mode (REW)
3) Referenced to the Play mode
NOTES:
V1
V
V2
CH1 CH2
Connection Points
Test Equipment/ Fixture
• T-160 Tape
• T-120 Tape
Specification
• Be sure there is no tape jamming or curling at
the begining, middle or end of the tape.
V1/V MAX
0.7
V2/V MAX
0.8
RF ENVELOPE OUTPUT
