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MZ-NH1
TABLE OF CONTENTS
1. SERVICING NOTES ............................................... 4
2. GENERAL ................................................................... 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Bottom Panel Sub Assy ................................................... 7
3-3. MAIN Board.................................................................... 8
3-4. Upper Panel Sub Assy ..................................................... 8
3-5. Control Ornament Block ................................................. 9
3-6. Mechanism Deck Assy (MT-MZNH1-181) .................... 9
3-7. Gear (SA), Gear (SB) ...................................................... 10
3-8. Op Service Assy .............................................................. 10
3-9. DC SSM18D/C-NP Motor (Spindle) (M701),
DC SSM21A/C-NP Motor (Sled) (M702),
DC Motor Unit (Over Write Head Up/Down) (M703) ... 11
3-10. Holder Assy ..................................................................... 11
4. TEST MODE ............................................................... 12
5. ELECTRICAL ADJUSTMENT ............................. 16
6. DIAGRAMS
6-1. Block Diagram –MD SERVO Section – ......................... 21
6-2. Block Diagram –AUDIO Section –................................. 22
6-3. Block Diagram –POWER SUPPLY Section – ................ 23
6-4. Schematic Diagram –MAIN Section (1/9) – ................... 25
6-5. Schematic Diagram –MAIN Section (2/9) – ................... 26
6-6. Schematic Diagram –MAIN Section (3/9) – ................... 27
6-7. Schematic Diagram –MAIN Section (4/9) – ................... 28
6-8. Schematic Diagram –MAIN Section (5/9) – ................... 29
6-9. Schematic Diagram –MAIN Section (6/9) – ................... 30
6-10. Schematic Diagram –MAIN Section (7/9) – ................... 31
6-11. Schematic Diagram –MAIN Section (8/9) – ................... 32
6-12. Schematic Diagram –MAIN Section (9/9) – ................... 33
6-13. Printed Wiring Board –MAIN Section (1/2) – ................ 34
6-14. Printed Wiring Board –MAIN Section (2/2) – ................ 35
7. EXPLODED VIEWS
7-1. PANEL SECTION........................................................... 49
7-2. MAIN SECTION ............................................................ 50
7-3. MECHANISM DECK SECTION................................... 51
8. ELECTRICAL PARTS LIST................................ 52
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.