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Table of Contents
SAFETY INFORMATION ............................. 2
Electrostatic Discharge Sensitive (ESDS) ............... 3
120V Version Specifications ..................... 4-5
230V Version Specifications ..................... 6
120V Disassembly/Assembly Procedures ................... 7-9
230V Disassembly/Assembly Procedures ................ 10-12
BMA-125 Test Procedures 120V ...................... 13-16
BMA 125 Test Procedures 230V ........................... 16
Part List Notes ................................. 17
120V Main Assembly Part List .......................... 18
Figure 1. 120V Chassis Layout ...............................19
120V Amp PCB Part List .............................. 20-22
120V Tone/Volume Control PCB Part List ......................... 23-24
120V Equalizer PCB Part List ..................................... 25-26
230V Main Assembly Part list ................................. 27-28
230V Amp PCB Part List ......................................... 29-31
230V Tone/Volume/Equalizer PCB Part List ...................... 32-35
Input Module 2B37 Part List ........................................ 36
Input Module 2B50 Part List .................................... 37-38
Figure 2. 2B37 Schematic and PCB Layout .................................39
Figure 3. 2B50 Schematic and PCB Layout ...........................40
Figure 4. 120V Driver PCB Layout ..................................41
Figure 5. 120V Tone/Volume Control PCB Layout ..........................41
Figure 6. 120V Equalizer PCB Layout (Solder Side) ...........................42
Figure 7. 120V Equalizer PCB Layout (Component Side) ...........................42
Figure 8. 230V Driver PCB Layout .........................................43
Figure 9. 230V Tone/Volume/Equalizer PCB Layout ............................44
Figure 10. and 11. 230V wiring diagram ................................45-46
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SAFETY INFORMATION
1. Parts that have special safety characteristics are identified by the symbol on
schematics or by special notes on the parts list. Use only replacement parts that
have critical characteristics recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed
parts are acceptably insulated from the supply circuit before returning the unit
to the customer. Use the following checks to perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug
the AC line cord directly into a 120V AC outlet. (Do not use an isolation
transformer during this test.) Use a leakage current tester or a metering
system that complies with American National Standards Institute (ANSI)
C101.1 "Leakage Current for Appliances" and Underwriters Laboratories
(UL) 1492 (71). With the unit AC switch first in the ON position and then in
OFF position, measure from a known earth ground (metal water pipe,
conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket,
metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially
any exposed metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 milliampere. Reverse the unit power
cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN
THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD
THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE
CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and
connect a jumper wire between the two prongs of the plug. (2)Turn on the power
switch of the unit. (3) Measure the resistance with an ohmmeter between the
jumpered AC plug and each exposed metallic cabinet part on the unit. When the
exposed metallic part has a return path to the chassis, the reading should be
between 1 and 5.2 Megohms. When there is no return path to the chassis, the
reading must be "infinite". If it is not within the limits specified, there is the poss-
ibility of a shock hazard, and the unit must be repaired and rechecked before it
is returned to the customer.
