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CHAPTER 5
ALIGNMENT
5-1. CLOCK FREQUENCY ADJUSTMENT
Equipment
: FREQUENCY COUNTER
Condition
: Power On
Measuring Point : pin 42 of IC4 (HB-501P)
pin 6 of IC2 (HB-501F)
Specification
: 3,694,862 Hz ±10 Hz (HB-501 P)
3,579,545 Hz +
Hz (HB-501F)
Adjustment
: C46/MAIN BOARD
5-2. CASSETTE RECORDER ADJUSTMENT
5-2-1. RECORD/PLAYBACK Head Azimuth
Adjustment
Equipment
: OSCILLOSCOPE
Condition
: Playback the alignment tape P-4-A063.
Switch Setting
: MONITOR SW/HIGH
Measuring Point : IC2-1/CMT BOARD
Specification
: OUTPUT LEVEL = MAXIMUM
Adjustment
: Record/Playback Head Azimuth Adjustment
Screw
5-2-2. Tape Speed Adjustment
Equipment
: FREQUENCY COUNTER
Condition
: Playback the alignment tape WS-48A.
Measuring Point : IC2-1/CMT BOARD
Specification
: 2990 Hz - 3005 Hz
Adjustment
: The Variable Resistor within the Motor.
Put the screwdriver (—) into the motor from the
bottom, and adjust.
5-3. RGB UNIT ADJUSTMENT
(FOR HB-501F)
5-3-1. Preparations
1. The Programming Example for Adjustment (BASIC)
10
' ******************
20
' *
*
30
'* CHECK PROGRAM
*
40
'* -for HB-501F
*
50
'
*
*
60
'******************
70
CLS
80
PRINT;"Push any key?"SPRINT
90
PRINT;"1-Push W key=RGB level
adj."
100 PRINT 5 "2 .Push R key—Return11
110 A*=INKEY*
120 IF A*="W" OR A*«,,w" THEN 150
130 IF A$=,,R" OR A*~"r11 THEN 170
140 GOTO 110
150 SCREEN 1sCOLOR 15,15,15:'White
160 GOTO 80
170 SCREEN IsCOLOR 15f4,7s'Menu
180 GOTO 80
1.90 END
2.
Set the program given above to RUN condition, and to the
adjustment after the section 5-3-2.
3.
Connection
Connect the Monitor TV (75
n
INPUT) to CN8 (RGB OUT-
PUT)/MAIN
5-3-2. SYNC Pulse Clamp Adjustment
Equipment
: OSCILLOSCOPE
Condition
: •
Set the sample program to RUN condition, and
depress the W key.
•
After the adjustment, depress the R key.
Checkpoint : Emitter of Q3/RGB UNIT
Specification : SYNC LEVEL = BLACK LEVEL
WHITE LEVEL
BLACK LEVEL
SYNC LEVEL
Adjustment
: VR1/RGB UNIT
►
HB-50 IP/50 IF
5-1
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