Safety Information - JBL PSW-D112 Service Manual

Amplifier/Subwoofer
Warning
Any person performing service of this unit will be exposed
to hazardous voltages and the risk of electric shock. It is
assumed that any person who removes the amplifier from
this cabinet has been properly trained in protecting against
avoidable injury and shock. Therefore, any service
procedures are to be performed by qualified service
personal ONLY!
Caution
This unit does not have a power switch. Hazardous
voltages are present within the unit whenever it is
plugged in.
Before the amplifier is plugged in, be sure its rated voltage
corresponds to the voltage of the AC power source to be
used. Incorrect voltage could cause damage to the
amplifier when the AC power cord is plugged in. Do not
exceed rated voltage by more than 10%: operation below
90% of rated voltage will cause poor performance or may
shut the unit off.
Leakage/Resistance Check
Before returning the unit to the customer, perform a
leakage or resistance test as follows:
Leakage Current. Note there is no power switch on this
unit. When the power plug is plugged in, the unit is live.
Connect the unit to its rated power source. Using an
ammeter, measure the current between the neutral side of
the AC supply and chassis ground of the unit under test. If
leakage current exceeds 0.5A, the unit is defective.
Reverse the polarity of the AC supply and repeat.
Resistance. Measure the resistance from either side of the
line cord to chassis ground. If it is less than 500k ohms, the
unit is defective.
WARNING! DO NOT return the unit to the customer if it
fails one of these tests until the problem is located and
corrected.
Critical Components
All components identified with the IEC symbol
in the par t s list and the schematic diag
designate components in which saf
of special significance when replacing a
component identified with
replacement par t s designated in the par ts list or par ts with
the same r ating of resistance , wattage or v oltage .
IMPORTANT SERVICE NOTES: When testing the PSW-D112/DPS-12 Series amplifier, a load must always be
connected to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load.
All AC powered test instruments (meters, oscilloscopes, etc.) must have a floating ground, i.e., be
connected to an isolation transformer.

SAFETY INFORMATION

List of Safety Components Requiring
Exact Replacements
(all parts POWER AMP PCB except TR2)
F1
PWRCORD
TRX1
C1, 2
C6 (Rev0)
C6 (Rev1)
TR2
DBR
R1
R4a/b/c
R9
R15
R16, 17
R33 (Rev0) only) 332 0.5W 5% carbon film
R50 (Rev0) only) 332 0.5W 5% carbon film
R52, 57
R61
S64AMI
Faceplate
CMC1
L1
Fuse PCB
Main PCB
ram
ety can be
. Use only the
PSW-D110/DPS-10
Fuse SLO BLO 1.25A 250V UL approved
SPT-2 or better with polarized plug, UL
approved wire with the hot side to fused
side. Use with factory replacement panel
strain relief only.
Transformer. Use only factory replacement.
4700uF,50V electrolytic filter caps. Be sure
replacement part is at least the same
working voltage and capacitance rating.
Also the lead spacing is important.
Incorrect spacing may cause premature
failure due to internal cabinet pressure and
vibration.
4.7uf 100V 80/-20% Electrolytic redial NP
4.7uf 100V 80/-20% Electrolytic redial NP
MPS A13 30V NPN(Darl)
Bridge Rect 200V Use only factory replacement
10M 0.25W 5% carbon film
0.1 0.5W 5% metal film
3.3 5W 5% ceramic wirewound
100k 0.5W 5% carbon film
1.8k 5W 5% ceramic wirewound
2.7k 5W 5% ceramic wirewound
3.9k 3W 5% carbon film
Power output module. Use only factory
replacement
Faceplate. Use only factory replacement
Use only factory replacement
Use only factory replacement
Use only factory replacement
Use only factory replacement
2