Emerson EWC1902 Service Manual Page 61
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- Table of contents
- BOOKMARKS
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2-3-3 Z11MA
1-A. Preliminary/Final Checking and
Alignment of Tape Path
Purpose:
To make sure that the tape path is well stabilized.
Symptom of Misalignment:
If the tape path is unstable, the tape will be damaged.
Note: Do not use an Alignment Tape for this proce-
dure. If the unit is not correctly aligned, the tape may
be damaged.
1. Play back a blank cassette tape and check to see
that the tape runs without creasing at Guide Rollers
[2] and [3], and at points A and B on the lead sur-
face. (Refer to Fig M3 and M4.)
2. If creasing is apparent, align the height of the guide
rollers by turning the top of Guide Rollers [2] and
[3] with a Guide Roller Adj. Screwdriver. (Refer to
Fig. M3 and M5.)
3. Check to see that the tape runs without creasing at
Take-up Guide Post [4] or without snaking between
Guide Roller [3] and AC Head. (Fig. M3 and M5)
4. If creasing or snaking is apparent, adjust the Tilt
Adj. Screw of the AC Head. (Fig. M6)
1-B. X Value Alignment
Purpose:
To align the Horizontal Position of the Audio/Control/
Erase Head.
Symptom of Misalignment:
If the Horizontal Position of the Audio/Control/Erase
Head is not properly aligned, maximum envelope can-
not be obtained at the Neutral position of the Tracking
Control Circuit.
1. Connect the oscilloscope to J189 (PB-C-MONI)
and J116 (CTL) on the Main CBA. Use J190 (RF-
SW) as a trigger.
2. Play back the Gray Scale of the Alignment Tape
(FL8N) and confirm that the PB FM signal is
present.
3. Set the Tracking Control Circuit to the center posi-
tion by pressing CH UP button then “ PLAY ” button
on the unit. (Refer to note on bottom of page
2-3-4.)
4. Use the X-Value Adj. Screwdriver so that the PB
FM signal at J189 (PB-C-MONI) is maximum. (Fig.
M6)
5. Press CH UP button on the unit until the CTL wave-
form has shifted by approx. +2msec. Make sure
that the envelope is simply attenuated (shrinks in
height) during this process so that you will know
the envelope has been at its peak.
Guide Roller [2]
Guide Roller [3]
A
B
Take-up Guide Post [4]
AC Head
Fig. M3
Lead Surface of Cylinder
Tape
Fig. M4
Guide Roller
Tape
Correct
Incorrect
Take-up Guide
Post
Tape
Fig. M5
Azimuth Adj. Screw
X-Value Adj.
Screwdriver
Tilt Adj. Screw
AC Head
Fig. M6
- SERVICE MANUAL 1
- IMPORTANT SAFETY NOTICE 2
- MAIN SECTION 3
- SPECIFICATIONS 4
- <AUDIO> 5
- IMPORTANT SAFETY PRECAUTIONS 6
- Precautions during Servicing 8
- Safety Check after Servicing 9
- STANDARD NOTES FOR SERVICING 10
- Tweezers 11
- Soldering Iron 11
- Presolder 12
- Flat Pack-IC 12
- Instructions for Handling 13
- Semiconductors 13
- PREPARATION FOR SERVICING 14
- 1 92 3 4 5 6 7 8 15
- 1011 1412 15
- [1] Rear Cabinet 17
- [2] Tray Chassis 17
- [4] Main CBA 17
- [3] Deck Unit 17
- 1-6-2 T7300DC 18
- 1-6-3 T7300DC 19
- 1-6-4 T7300DC 20
- 1-6-5 T7300DC 21
- Fig. 1-1 22
- Remote control unit (Bottom) 22
- 3. TV AGC Adjustment 23
- 4-1. H Adjustment 23
- 4-2. C-Trap Adjustment 23
- 4-3. Y DL Time Adjustment 24
- 5. V. Size Adjustment 24
- 6. V. Shift Adjustment 24
- PATTERN GENERATOR 25
- RF INPUT 25
- 9. Sub-Brightness Adjustment 26
- 10. Focus Adjustment 26
- 12. CCS Text Box Location 26
- 13.Purity Adjustment 27
- 14. Convergence Adjustment 27
- BLOCK DIAGRAMS 29
- Video Block Diagram 30
- Audio Block Diagram 31
- Chroma/Tuner Block Diagram 32
- CRT/H.V. Block Diagram 33
- HOT COLD 34
- MECHANICAL TROUBLE INDICATOR 35
- Countermeasure for Mechanical 36
- Malfunction 36
- Repair method #1 37
- Repair method #2 38
- Repair method #3 38
- Repair method #4 38
- Standard Notes 39
- T7300SCM1 41
- 1-9-6 1-9-7 1-9-8 T7300SCM2 42
- T7300SCM3 43
- Main 4/4 Schematic Diagram 44
- Main CBA Top View 45
- Sensor CBA 45
- Top View 45
- (START-SENSOR) 45
- Main CBA Bottom View 46
- CRT CBA Top View 47
- CRT CBA Bottom View 47
- Z11WF1-10-1 1-10-2 48
- WIRING DIAGRAM 49
- SYSTEM CONTROL TIMING CHARTS 50
- IC PIN FUNCTION DESCRIPTIONS 52
- LEAD IDENTIFICATIONS 54
- DECK MECHANISM 55
- STANDARD MAINTENANCE 56
- A/C Head 57
- J-1-1, J-1-2 58
- Cam Gear 59
- LDG Belt (B) 59
- Incorrect 61
- Waveform 62
- Erase Head 62
- OF DECK MECHANISM 63
- [20],[23] 63
- Lead with 66
- Blue Stripe 66
- Lead with White Stripe 67
- Fig. DM11 68
- Fig. DM12 68
- Fig. DM14 69
- Fig. DM13 69
- Fig. DM15 70
- Fig. DM16 70
- Fig. DM17 70
- Fig. DM18 70
- Alignment 3 72
- Cam Gear (A), Rack Assembly 72
- EXPLODED VIEWS AND 73
- PARTS LIST SECTION 73
- EXPLODED VIEWS 74
- 3-1-3 T7300PEX 75
- DECK EXPLODED VIEWS 76
- Deck Mechanism View 2 77
- Deck Mechanism View 3 78
- MECHANICAL PARTS LIST 79
- CRT Warning Label 80
- CRT Type No 80
- ELECTRICAL PARTS LIST 81
- 20020205 3-3-2 T7300EL 82
- 20020205 3-3-3 T7300EL 83
- 20020205 3-3-4 T7300EL 84
- 20020205 3-3-5 T7300EL 85
- 20020205 3-3-6 T7300EL 86
- 20020205 3-3-7 T7300EL 87
- 20020205 3-3-8 T7300EL 88
- 20020205 3-3-9 T7300EL 89
- SENSOR CBA 90
- DECK PARTS LIST 91
- B359 CLEANER LEVER B361 91
- Type ID No. ID No 91
- A 0VM304413 0VM411114 91
- B 0VM305090 Not used 91
- Printed in Japan 92
- 2002-02-20 HO 92
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