1.3. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
·
No sound is heard when the power is turned on.
·
Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note :
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
1.4. Caution For Fuse Replacement
1.5. Safety Part Information
Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by
in the Schematic Diagrams & Replacement Parts List. It is essential that these critical parts should
be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without
permission of manufacturer.
Table 1
Reference No.
Part No.
Part name & Description
Remarks
L5601
G0B9R5K00001
CHOKE COIL
L5602
G0B9R5K00001
CHOKE COIL
L5603
G0B9R5K00001
CHOKE COIL
L5604
G0B9R5K00001
CHOKE COIL
L5950
ELF15N035AN
LINE FILTER
T5950
G4CYAYY00147
MAIN TRANSFORMER
T5951
G4C2AAJ00005
SUB TRANSFORMER
RL5950
K6B1AEA00015
POWER RELAY
F1
K5D402APA008
FUSE
FP5920
K5G103A00019
FUSE PROTECTOR
FP5940
K5G103A00019
FUSE PROTECTOR
FP5950
K5G402A00025
FUSE PROTECTOR
JK5950
K2AB2B000007
JK AC INLET
A2
K2CB2CB00018
AC CORD
R5950
ERC12UGK335D
3.3M 1/2W
C5701
ECQU2A334MLA
100 6.3V
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
5
SA-AK750P / SA-AK750PC
Summary of Contents for SA-AK750P
Page 8: ...8 SA AK750P SA AK750PC ...
Page 13: ...13 SA AK750P SA AK750PC ...
Page 16: ...With reference to page 13 of the operating instruction manual 16 SA AK750P SA AK750PC ...
Page 18: ...With reference to page 17 of the operating instruction manual 18 SA AK750P SA AK750PC ...
Page 29: ...10 3 Main Parts Location 29 SA AK750P SA AK750PC ...
Page 40: ...10 16 1 Replacement of Pinch Roller and Head Block 40 SA AK750P SA AK750PC ...
Page 47: ...12 4 Checking and Repairing of Power P C B 47 SA AK750P SA AK750PC ...
Page 49: ...Fig 7 49 SA AK750P SA AK750PC ...
Page 53: ...15 2 Power P C B Transformer P C B 15 3 Panel P C B 53 SA AK750P SA AK750PC ...
Page 54: ...15 4 Main P C B 54 SA AK750P SA AK750PC ...
Page 55: ...15 5 XM P C B 15 6 Deck P C B 55 SA AK750P SA AK750PC ...
Page 56: ...15 7 Waveform Chart 56 SA AK750P SA AK750PC ...
Page 58: ...58 SA AK750P SA AK750PC ...
Page 66: ...SA AK750P SA AK750PC 66 ...
Page 68: ...68 SA AK750P SA AK750PC ...
Page 88: ...SA AK750P SA AK750PC 88 ...
Page 93: ...23 Exploded Views 23 1 Cabinet Parts Location SA AK750P SA AK750PC 93 ...
Page 94: ...SA AK750P SA AK750PC 94 ...
Page 95: ...23 2 Deck Mechanism Parts Locations RAA4403 S SA AK750P SA AK750PC 95 ...