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Video Cassette Recorder
MV-8080G
Service Manual
NO.289C3090
MV-8080G_1 Cover Page 1 97.12.10, 20:35 Adobe PageMaker 6.0J/PPC
Quick Reference of Specific Parts List
(Latest upgrade list Dec. '97)
The parts No. of Deck Mechanisms, Face Plate Ass'y and Video Circuit Boards for MV-8080G.
CABINET & CHASSIS
Ref. No. Part No. Description
1 59311 UPPER DECK MECHANISM (TN6500-116M) FOR P.B. ONLY
2 59277 LOWER DECK MECHANISM (TN6500-105M) FOR REC/PB
21 22329340 FACE PLATE ASS'Y (MV-8080G)
32 26021610 POWER CORD
35R93C0 UPPER VIDEO CIRCUIT BOARD (MV-8080G)
36 MAIN CIRCUIT BOARD (WITH POWER SECTION)
(IC1701) (119412400) (IC,CXP88132-185Q)
37 HEAD CIRCUIT BOARD
38 SCART CIRCUIT BOARD
35R94C0 LOWER VIDEO CIRCUIT BOARD (MV-8080G) LOWER DECK
39 MAIN CIRCUIT BOARD (WITH TUNER)
(ET2A01) (104307420) (ET-TMLG1-103A)
(IC2701) (119413400) (IC,CXP87360-120Q)
(IC2703*) (113112B00) (IC,AT24C02-10PC)
40 HEAD CIRCUIT BOARD
For details, refer to pages 26 to last page.
* The IC ROM settings vary for each model, so please specify the model you are using when ordering replace-
ment IC-ROM 2703 parts.
ACCESSORIES
Ref. No. Part No. Description
1 1080738H0 REMOTE CONTROLLER, RC-738
2 28529280 IN-BOX MV-8080G
3 28939060 OWNER'S MANUAL KIT MV-8080G
MV-8080G_1_Cover2 Page 2 97.12.10, 20:38 Adobe PageMaker 6.0J/PPC
CONTENTS
MAINTENANCE PRECAUTIONS ......................................................................... 2
ELECTRICAL ADJUSTMENT .............................................................................. 5
1. PLAYBACK SWITCHING POINT ADJUSTMENT ......................................................................................... 5
MECHANICAL ADJUSTMENT ............................................................................ 6
DECK ADJUSTMENT POINTS ........................................................................................................................... 6
1. MECHANISM CONTROL .............................................................................................................................. 7
2. ADJUSTMENT OF BT TORQUE IN PLAY MODE ........................................................................................ 8
3. AUDIO/CTL HEAD ......................................................................................................................................... 9
4. TAPE TRANSPORT SYSTEM CHECKS AND ADJUSTMENT ..................................................................... 9
5. INTERCHANGEABILITY ADJUSTMENT .................................................................................................... 11
6. RG POST HEIGHT ADJUSTMENT .............................................................................................................. 14
7. FRONT LOADING ASSEMBLY ATTACHMENT ........................................................................................... 15
PERIODIC MAINTENANCE .............................................................................................................................. 16
SERVICING DIAGRAM AND PARTS LIST ....................................................... 18
1. EXPLODED VIEW OF THE CASSETTE DECK MECHANISM ................................................................... 18
2. BLOCK DIAGRAM ....................................................................................................................................... 22
3. TERMINOLOGY REFERENCES ................................................................................................................. 23
4. SCHEMATIC DIAGRAM ......................................................................................................... Separate Sheet
5. IC, TRANSISTOR LEAD IDENTIFICATION ................................................................................................ 25
6. UPPER CABINET EXPLODED VIEW (DECK UNIT 1) ............................................................................... 26
LOWER CABINET EXPLODED VIEW (DECK UNIT 2) ............................................................................... 27
7. PARTS LIST FOR CABINET & CHASSIS ................................................................................................... 28
8. PC BOARD ASS'Y (UPPER MAIN) PARTS LOCATION ............................................................................. 29
PC BOARD ASS'Y (LOWER MAIN) PARTS LOCATION ............................................................................ 31
9. PC BOARD ASS'Y (UPPER MAIN) PARTS LIST ....................................................................................... 33
10. PC BOARD ASS'Y (HEAD 1, 2) PARTS LIST ............................................................................................. 41
11. PC BOARD ASS'Y (HEAD 1, 2) PARTS LOCATION .................................................................................. 41
12. PC BOARD ASS'Y (SCART) PARTS LIST .................................................................................................. 42
13. PC BOARD ASS'Y (SCART) PARTS LOCATION ....................................................................................... 42
14. PC BOARD ASS'Y (LOWER MAIN) PARTS LIST ....................................................................................... 43
TABLE OF IC PIN VOLTAGE ...................................................................................................................... 52
1
MV-8080G_2 Con(1) Page 1 97.12.10, 20:40 Adobe PageMaker 6.0J/PPC
MAINTENANCE PRECAUTIONS
Since this model is a twin-deck system, some of the items to be adjusted during maintenance can be hard to
reach. (These parts are marked with an in the table below.)
: Serviceable item
: Difficult
: Cannot be serviced
Maintenance ELEC. ADJ. MECHA. ADJ. Treatment of the solder side
Position
of the Deck Unit SWing Point e.t.c. DECK Adj. on the Main PCB
Upper 1 2 3
Lower 4 5 6
External 7 or 8 9
Items 3, 5, 6, 7 and 8 in the table above cannot be serviced in their current positions. To service these
parts, move the parts marked to those marked on the Deck Unit (a single deck VCR or VCP, including Deck
mechanism and Main PCB). in the table. After testing that the serviced items work, replace the Deck Unit in its
original position.
Pattern (A) Original Position Pattern (B) Upper and Lower Deck Unit
Positions Inverted
4 4
1 2 1 2 1
AC IN
Deck Unit 1 Upper Position Deck Unit 2
Flexible Wire Harness AC IN
Deck Unit 2 Lower Position Deck Unit 1
( 3 56 ) ( 3 56 ) Cannot be serviced.
SYNCHROSCOPE
7 9 9
External Position Deck Unit 1
Deck Unit 2
AC IN
Deck Unit 1 Deck Unit 2
AC IN
8 Cannot be 7 8
serviced.
Pattern (C) External Position (Upside Down) Pattern (D) External Position (Upside Down)
* Operation cannot be tested with the deck mechanism alone.Temporarily assemble the mechanism with the Main PCB
to test the mechanism.
To test Pattern (B), remove the Flexible Wire Harness, then exchange the Deck Mechanism Unit 2 with Deck
Mechanism Unit 1 and reconnect the parts.
To test Patterns (C) and (D), remove the Flexible Wire Harness, then the Deck Mechanism and Main PCB (in this
order) from the Chassis. Then temporarily assemble the removed Main PCB and Deck Mechanism and reconnect
the parts. To do this, fix the two spacers of the Deck Mechanism to the back of the Main PCB with screws.
2
MV-8080G_3(2~4) Page 2 97.12.10, 20:41 Adobe PageMaker 6.0J/PPC
2 Mechanical Adjustment OK
R1713 1 Switching
Point Adjust-
ment OK
Deck Unit 1
Deck Unit 2
Pattern (A) Original Position
*Fix the two spacers of the Deck Mechanism
to the back of the Main PCB with screws.
9 Treatment of the solder side
on the Main PCB
Deck Unit 2
Deck Unit 1
Pattern (C) External Position (Upside Down)
3
MV-8080G_3(2~4) Page 3 97.12.10, 20:41 Adobe PageMaker 6.0J/PPC
2 Mechanical Adjustment OK
R1713 1 Switching
Point Adjustment OK
Deck Unit 2
Deck Unit 1
Pattern (B) Deck Unit 1 and 2 Positions Inverted
*Fix the two spacers of the Deck Mechanism
to the back of the Main PCB with screws.
9 Treatment of the solder side
on the Main PCB
Deck Unit 1
Deck Unit 2
Pattern (D) External Position (Upside Down)
4
MV-8080G_3(2~4) Page 4 97.12.10, 20:41 Adobe PageMaker 6.0J/PPC
ELECTRICAL ADJUSTMENT
1. PLAYBACK SWITCHING POINT ADJUSTMENT
Mode : PLAY
Test Signal : TPS-13 or 13S
Check Point : FIP
DECK TYPE
FOR UPPER DECK UNIT 1 WITH POWER
FOR LOWER DECK UNIT 2 WITH TUNER
Procedure SECTION
Adjustment
R1713 CH UP/DOWN (5/) KEY
Point
Plays the adjustment tape and automatically adjusts ATR. The ATR is finished when "ATR" on
1)
the FIP stops blinking.
Short the connection between PG ADJ and GND on the MAIN PCB as indicated in Figure 1.
2) Then, must of the segments on the FIP, for example, "ATR" goes OFF. See Figure 2 below.
PG ADJ (J257), GND (J259) PG ADJ (J228), GND (J230)
To adjust the display for FIP (H1071) (Display To adjust the display for FIP (H701), (Display
3) B below.) B below).