Canon DMCIII Service Manual
Video Product
DMC III
DMC III
MECHANICAL
CHASSIS
ENGLISH EDITION
c
CANON INC. 2003
Canon Inc.
Digital Imaging Products Service Dept.
First Edition : Feb. 2003
First Print : Feb. 2003
CHAPTER 1. OPERATION
CONTENTS
1. Outline ----------------------------------------------------------------------------------------------------------------------------------------- 2-1
1-1 Configuration Comparison of DMC II and DMC III----------------------------------------------------------------------------- 2-1
1-2 DMC III Slide in/out Status --------------------------------------------------------------------------------------------------------- 2-2
1-3 Mechanical Modes and Mode Switches-------------------------------------------------------------------------------------------- 2-3
2. Operation --------------------------------------------------------------------------------------------------------------------------------------- 2-4
2-1 Main Mechanical Parts --------------------------------------------------------------------------------------------------------------- 2-4
2-1-1 Nomenclatures -------------------------------------------------------------------------------------------------------------- 2-4
2-2 Operation of Main Parts -------------------------------------------------------------------------------------------------------------- 2-5
2-2-1 Gear Train ------------------------------------------------------------------------------------------------------------------- 2-5
2-2-2 Reel Hub Drive ------------------------------------------------------------------------------------------------------------- 2-6
2-2-3 Loading Operation of Tape Guide Base --------------------------------------------------------------------------------- 2-7
2-2-4 Tape Path -------------------------------------------------------------------------------------------------------------------- 2-8
2-3 Mechanical Parts in Mode Transition ---------------------------------------------------------------------------------------------- 2-9
2-3-1 Cassette-In → Cassette-Down -------------------------------------------------------------------------------------------- 2-9
2-3-2 Loading-1 (Tape Detection R with Tape) ------------------------------------------------------------------------------2-10
2-3-3 Loading-2 (without Tape) ------------------------------------------------------------------------------------------------ 2-11
2-3-4 Loading-3 (with Tape/BOT) --------------------------------------------------------------------------------------------- 2-12
2-3-5 Loading-4 (Blank Search-1) --------------------------------------------------------------------------------------------- 2-13
2-3-6 Loading-5 (Blank Search-2) --------------------------------------------------------------------------------------------- 2-14
2-3-7 Loading-6 (Blank Search-3) --------------------------------------------------------------------------------------------- 2-15
2-3-8 Loading-7 (Blank Search-4) --------------------------------------------------------------------------------------------- 2-16
2-3-9 STOP → PLAY ------------------------------------------------------------------------------------------------------------2-17
2-3-10 STOP → FF --------------------------------------------------------------------------------------------------------------2-18
2-3-11 STOP → REW ----------------------------------------------------------------------------------------------------------- 2-19
2-3-12 PLAY → CUE -----------------------------------------------------------------------------------------------------------2-20
2-3-13 PLAY → REV -----------------------------------------------------------------------------------------------------------2-21
2-3-14 PLAY → STILL ---------------------------------------------------------------------------------------------------------2-22
2-3-15 EJECT (with tape) -------------------------------------------------------------------------------------------------------2-23
2-3-16 EJECT (without tape) --------------------------------------------------------------------------------------------------- 2-24
DMC III
CHAPTER 1. OPERATION
1. Outline
DMC III is a digital video mechanical chassis which has been developed newly to enhance competitiveness in cost and reliability.
Digital Mechanism Chassis
DMC III DMC II
Drum Diameter 21.7 mm 21.7 mm
Slide ●●
Size Depth 56 mm 56 mm
Width 72 mm 72 mm
Height 23. 7 mm 22.2 mm
Volume 95 cc 89 cc
Weight 100 g 100 g
Number of Parts 194 272
FF/REW Speed 30 × 30 ×
1-1 Configuration Comparison of DMC II and DMC III
DMC III DMC II
56mm
72mm
23.7mm
72mm
22.2mm
56mm
Fig. 1-1
1-1
1-2 DMC III Slide in/out Status
Slide in status Slide out status
DMC III
CHAPTER 1. OPERATION
23.7mm
39.4mm
56mm 73mm
Fig. 1-2
1-2
CHAPTER 1. OPERATION
1-3 Mechanical Modes and Mode Switches
EJECT STAND-BY LD1 LD2 STOP PLAY/REV
Resistance KΩ (COM to 2 ) 18 36 54 72 90 0
T Main Brake OFF OFF OFF OFF ON OFF
TB UNIT OFF OFF OFF OFF OFF OFF/ON
S Main Brake OFF OFF OFF OFF ON OFF
S Soft Brake ON ON ON ON OFF OFF
Pinch Roller OFF OFF OFF OFF OFF ON
COM
DMC III
1
0
STOP
18KΩ
2
1
LD2
18KΩ
2
LD1
18KΩ
3
STAND-BY
18KΩ
4
EJECT
18KΩ
5
PB
0
5
1
4
2
3
Fig. 1-3
1-3
2. Operation
2-1 Main Mechanical Parts
2-1-1 Nomenclatures
DMC III
CHAPTER 1. OPERATION
Capstan Motor
Tension Arm Ass'y
Tension Brake Ass'y
Main S Brake
S Reel Ass'y
Soft S Brake Slide Main Idler
Loading Motor Ass'y
Main T Brake
S Guide Roller Ass'y Drum Unit T Guide Roller Ass'y
Review Arm Ass'y
Pinch Roller Ass'y
Eject Lever
Pinch Push Lever
T Reel Ass'y
TB Unit
S Loading Gear
Wheel Gear
Mode Switch Gear
Main Cam Gear
T Loading Gear
Capstan Gear
Timing Belt
Cam Lever Connect Gear Pulley Gear
Fig. 1-4
1-4
2-2 Operation of Main Parts
Loading Motor (1) rotates.
Wheel Gear (2) rotates.
Mode Switch Gear (3) rotates.
Main Cam Gear (4) rotates.
Cam Lever (5) turns. Connect Gear (6) rotates. Slide Main (7) moves.
2-2-1 Gear Train
DMC III
CHAPTER 1. OPERATION
LOADING
UNLOADING
Mode Switch Gear (3)
Loading Motor (1)
Wheel Gear (2)
Slide Main(7)Cam (5) Connect Gear (6)Main Cam Gear (4)
Fig. 1-5
1-5
2-2-2 Reel Hub Drive
Capstan Motor (1) rotates.
Capstan Gear (2) rotates.
Pulley Gear (4) is rotated by Timing Belt (3).
Idler (5) turns to engage
with T Reel Ass'y (6) or S Reel Ass'y (7).
T Reel Ass'y (6) or S Reel Ass'y (7) rotates.
DMC III
CHAPTER 1. OPERATION
S Reel Ass'y(7)
Capstan Motor (1)
Capstan Gear (2)
Timing Belt (3)
T Reel Ass'y(6)
T Reel Drive
S Reel Drive
Idler (5)
Fig. 1-6
Pulley Gear (4)
1-6
2-2-3 Loading Operation of Tape Guide Base
Connect Gear (1) rotates.
S Loading Gear (2) rotates.
T Loading Gear (4) rotates.
DMC III
CHAPTER 1. OPERATION
S Guide Roller Ass'y (3) slides.
Caught by Drum Base (6). Caught by Drum Base (6).
T Guide Roller Ass'y (5) slides.
S Guide Roller Ass'y (3) TGuide Roller Ass'y (5)Drum Base (6)
S Loading Gear (2)
LOADING
UNLOADING
T Loading Gear (4)Connect Gear (1)
Fig. 1-7
1-7
Tape Path
Tape is drawn out of S Reel (1).
Tape is tensioned by Tension Post (2).
Direction of tape is changed by P2 and P3 Posts (3), (4).
Tape runs around Drum Unit (5).
Direction of tape is changed by P5 Post (6).
Pinch Roller (8) is pressed against
Capstan Shaft (7) to feed tape.
DMC III
CHAPTER 1. OPERATION
Tape runs through P7 Post (9).
Tape is taken up by T Reel (10).
Tension Post (2) P2 Post (3) P3 Post (4) P5 Post (6)
Drum Unit (5)
P7 Post (9)
Capstan Shaft (7)
Pinch Roller (8)
S Reel (1) T Reel (10)
Fig. 1-8
1-8
2-3 Mechanical Parts in Mode Transition
2-3-1 Cassette-In → Cassette-Down
Insert cassette.
DMC III
CHAPTER 1. OPERATION
Cassette lid lock is released by Cassette Compartment Claw (2).
Press Cassette Compartment (1) in arrow direction (downward).
This makes Cassette Lid (5) free to open/close.
Lock Lever (3) moves along Lock Guide (4).
Lock Lever (3) turns in arrow direction.
Lock Cassette Compartment (1). Eject Lever (6) turns.
Lock Lever (3)
Cassette Compartment (1)
Cassette Compartment Claw (2)
Cassette Lid (5) opens.
Cassette-in Switch (7) is turned ON.
Lock Guide (4)
Cassette Lid (5)
EJECT Lever (6)
Lock Lever (3)
EJECT Lever (6)
Cassette-in Switch (7)
Fig. 1-9
1-9
2-3-2 Loading-1 (Tape Detection R with Tape)
Push down Cassette Compartment.
Cassette-in Switch turns ON.
Whether tape exists is detected.
A
B
No
Yes
Yes
No
Beginning of tape is detected.
Drum Unit (1) rotates.
Capstan Motor (2) rotates counterclockwise
(forward, 3× speed, 0.3 sec), and Idler (3)
turns to engage with T Reel Ass'y (4) for taking up tape.
Capstan Motor (2) stops.
Loading Motor (5) rotates counterclockwise.
Capstan Motor (2) rotates clockwise
(reversely, unit speed, 0.45 sec), and Idler (3)
turns to come into contact with Stopper of Reel Cover.
Slide Chassis (6) slides.
Tension Arm Ass'y (7), S Guide Roller Ass'y (8),
T Guide Roller Ass'y (9), Pinch Arm Ass'y (10) and
Review Arm Ass'y (11) move to take up tape.
Slide Chassis (6) stops moving.
Pinch Arm Ass'y (10) is pressed against
Capstan Shaft (13)
PLAY Position is detected.
Loading Motor (5) stops rotating.
To "Blank Search".
DMC III
CHAPTER 1. OPERATION
Loading Motor (5)
Tension Arm
Ass'y(7)
S Guide Roller
S Reel Ass'y(12)
Ass'y(8)
LOADING T
LOADING S
Slide Chassis (6)
Drum Unit (1)
Capstan Motor (2)
T Reel Ass'y(4)Idler (3)
Capstan Shaft (13)
Pinch Arm Ass'y(10)
Review ArmAss'y(11)
TGuide Roller Ass'y(9)
Fig. 1-10
1-10
2-3-3 Loading-2 (without Tape)
A
Loading Motor (5) rotates counterclockwise.
Slide Chassis (6) slides.
Tension Arm Ass'y (7), S Guide Roller Ass'y (8),
T Guide Roller Ass'y (9), Pinch Arm Ass'y (10)
and Review Arm Ass'y (11) move.
Slide Chassis (6) stops moving.
STOP Position is detected.
DMC III
CHAPTER 1. OPERATION
Loading Motor (5) stops rotating.
Standby at STOP status.
Loading Motor (5)
Tension Arm
Ass'y(7)
S Guide Roller
Ass'y(8)
Drum Unit (1)
Capstan Motor (2)
Capstan Shaft (13)
Pinch Arm Ass'y(10)
Review ArmAss'y(11)
TGuide Roller Ass'y(9)
S Reel Ass'y(12)
Slide Chassis (6)
T Reel Ass'y(4)Idler (3)
Fig. 1-11
1-11
2-3-4 Loading-3 (with Tape/BOT)
Drum Unit (1) rotates.
Capstan Motor (2) rotates counterclockwise
(forward, 3× speed, 0.3 sec), Idler (3) turns to engage
with T Reel Ass'y (4) for taking up tape.
Capstan Motor (2) stops.
Capstan Motor (2) rotates counterclockwise
(forward, 6× speed), Idler (3) turns to engage with
T Reel Ass'y (4) for taking up tape. Loading Motor (5)
rotates counterclockwise until tape leader is concealed.
Slide Chassis (6) slides.
Tension Arm Ass'y (7), S Guide Roller Ass'y (8),
T Guide Roller Ass'y (9), Pinch Arm Ass'y (10)
and Review Arm Ass'y (11) move to take up tape.
Slide Chassis (6) stops moving.
Pinch Arm Ass'y (10) is pressed against
Capstan Shaft (13).
PLAY Position is detected.
Loading Motor (5) stops rotating.
To "Blank Search".
B
DMC III
CHAPTER 1. OPERATION
Loading Motor (5)
Tension Arm
Ass'y(7)
S Guide Roller
Ass'y(8)
S Reel Ass'y(12)
Slide Chassis (6)
Drum Unit (1)
Fig. 1-12
Capstan Motor (2)
T Reel Ass'y(4)Idler (3)
Capstan Shaft (13)
Pinch Arm Ass'y(10)
Review ArmAss'y(11)
TGuide Roller Ass'y(9)
1-12
2-3-5 Loading-4 (Blank Search-1)
Blank Search.
Capstan Motor (2) rotates counterclockwise
(forward, 3× speed, 0.45 sec), Idler (3) turns
to engage with T Reel Ass'y (4) for taking up tape.
Whether signal is recorded on tape is checked.
C
C
D1"
D1'
D2'
Yes
No
Camera/VCR mode check.
E
Camera
VCR
After Capstan Motor (2) accelerates forward to
5× speed, it continues to rotate (0.56 sec),
and T Reel Ass'y (4) takes up tape.
Capstan Motor (2) stops.
Capstan Motor (2) rotates clockwise
(reversely, 3× speed, 0.45 sec), Idler (3) turns
to engage with S Reel Ass'y (12) for taking up tape.
After Capstan Motor (2) accelerates reversely to
5× speed, it continues to rotate,
and S Reel Ass'y (12) takes up tape.
Status change
D1D2
1.8 sec
elapses
Rush in BOT
Status change from without
record to with record is checked.
After status change is detected, Capstan Motor (2)
rotates continuously for 0.67 sec and stops.
Capstan Motor (2) rotates counterclockwise
(forward, 3× speed, 0.76 sec), and
T Reel Ass'y (4) takes up tape.
Capstan Motor (2) rotates for 0.78 sec while
decelerating from 3× speed to unit speed forward,
and T Reel Ass'y (4) takes up tape.
Capstan Motor (2) stops.
Standby at Recpause status.
DMC III
CHAPTER 1. OPERATION
Loading Motor (5)
Tension Arm
Ass'y(7)
Main S Brake (13)
S Reel Ass'y (12)
LOADING
UNLOADING
Drum Unit (1) Capstan Motor (2)
Review Arm
Ass'y(11)
Pinch Arm
Ass'y(10)
T Reel Ass'y(4)Main T Brake (14)Idler (3)
Fig. 1-13
1-13
2-3-6 Loading-5 (Blank Search-2)
D1
Capstan Motor (2) stops.
DMC III
CHAPTER 1. OPERATION
Whether recorded at current tape position is checked.
Yes
Capstan Motor (2) rotates counterclockwise
(forward, 3× speed, 0.45 sec),
and T Reel Ass'y (4) takes up tape.
Capstan Motor (2) accelerates and continues to rotate
(forward, 9× speed, 1.9 sec),
and T Reel Ass'y (4) takes up tape.
Capstan Motor (2) stops.
D1"
Loading Motor (5)
D1'
No
Drum Unit (1) Capstan Motor (2)
Tension Arm
Ass'y(7)
Main S Brake (13)
S Reel Ass'y (12)
Review Arm
Ass'y(11)
Pinch Arm
Ass'y(10)
T Reel Ass'y(4)Main T Brake (14)Idler (3)
Fig. 1-14
1-14
2-3-7 Loading-6 (Blank Search-3)
Capstan Motor (2) stops.
Capstan Motor (2) rotates counterclockwise
(forward, 3× speed), and T Reel Ass'y (4) takes up
tape until tape leader is concealed.
After tape leader is concealed, Capstan Motor (2)
continues to rotate for specified time and then stops.
Loading Motor (5) rotates clockwise.
Pinch Arm Ass'y (10) releases Capstan Shaft.
Main S Brake (13) is engaged with S Reel Ass'y (12)
to prevent it from turning.
Tension Arm Ass'y (7) turns clockwise.
Main T Brake (14) is engaged with T Reel Ass'y (4)
to prevent it from turning.
D2
STOP Position is detected.
Loading Motor (5) stops rotating.
Loading Motor (5) rotates counterclockwise.
Pinch Arm Ass'y (10) is pressed against
Capstan Shaft.
Main S Brake (13) releases S Reel Ass'y (12)
to make it free to turn.
Main T Brake (14) releases T Reel Ass'y (4)
to make it free to turn.
PLAY Position is detected.
Loading Motor (5) stops rotating.
D2'
DMC III
CHAPTER 1. OPERATION
Loading Motor (5)
Tension Arm
Ass'y (7)
Main S Brake (13)
S Reel Ass'y (12)
Drum Unit (1) Capstan Motor (2)
Fig. 1-15
Review Arm
Ass'y (11)
Pinch Arm
Ass'y (10)
T Reel Ass'y(4)Main T Brake (14)Idler (3)
1-15
2-3-8 Loading-7 (Blank Search-4)
Capstan Motor (2) stops.
Loading Motor (5) rotates counterclockwise.
Pinch Arm Ass'y (10) releases Capstan Shaft.
Main S Brake (13) is engaged with S Reel Ass'y (12)
to prevent it from turning.
Tension Arm Ass'y (7) turns clockwise.
Main T Brake (14) is engaged with T Reel Ass'y (4)
to prevent it from turning.
STOP Position is detected.
Loading Motor (5) stops rotating.
Drum Unit (1) stops.
Standby at STOP status.
E
Tension Arm
Ass'y (7)
Loading Motor (5)
S Reel Ass'y (12)
Main S Brake (13)
Drum Unit (1) Capstan Motor (2)
Pinch Arm
Ass'y (10)
T Reel Ass'y(4)Main T Brake (14)Idler (3)
Review Arm
Ass'y (11)
DMC III
CHAPTER 1. OPERATION
Fig. 1-16
1-16
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