Text preview for : hfe_denon_avr-1908_788_service_en.pdf part of DENON hfe denon avr-1908 788 service en DENON Audio AVR-1908 hfe_denon_avr-1908_788_service_en.pdf
Back to : hfe_denon_avr-1908_788_se | Home
Ver. 3
Please refer to the
MODIFICATION NOTICE.
SERVICE MANUAL
MODEL JP E3 E2 EK E2A E1C EUT
AVR-1908
AVR-788
AV SURROUND RECEIVER
For purposes of improvement, specifications and
design are subject to change without notice.
Please use this service manual with referring to the
operating instructions without fail.
Some illustrations using in this service manual are
slightly different from the actual set.
Denon Brand Company, D&M Holdings lnc.
X0353 V.03 DE/CDM 0802
SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.
CAUTION
Spots requiring particular attention when servicing, such Check that all screws, parts and wires removed or discon-
as the cabinet, parts, chassis, etc., have cautions indicated nected for servicing have been put back in their original po-
on labels or seals. Be sure to heed these cautions and the sitions, inspect that no parts around the area that has been
cautions indicated in the handling instructions. serviced have been negatively affected, conduct an insu-
lation check on the external metal connectors and between
the blades of the power plug, and otherwise check that
safety is ensured.
(1) An AC voltage is impressed on this set, so touching in-
ternal metal parts when the set is energized could
(Insulation check procedure)
cause electric shock. Take care to avoid electric shock,
Unplug the power cord from the power outlet, disconnect
by for example using an isolating transformer and
the antenna, plugs, etc., and turn the power switch on. Us-
gloves when servicing while the set is energized, un-
ing a 500V insulation resistance tester, check that the in-
plugging the power cord when replacing parts, etc.
sulation resistance between the terminals of the power
(2)There are high voltage parts inside. Handle with extra plug and the externally exposed metal parts (antenna ter-
care when the set is energized. minal, headphones terminal, microphone terminal, input
terminal, etc.) is 1M or greater. If it is less, the set must
be inspected and repaired.
Though great care is taken when manufacturing parts from
sheet metal, there may in some rare cases be burrs on the
edges of parts which could cause injury if fingers are
CAUTION
moved across them. Use gloves to protect your hands.
Many of the electric and structural parts used in the set
have special safety properties. In most cases these prop-
The set's parts have specific safety properties (fire resis- erties are difficult to distinguish by sight, and using re-
tance, voltage resistance, etc.). For replacement parts, be placement parts with higher ratings (rated power and
sure to use parts which have the same properties. In par- withstand voltage) does not necessarily guarantee that
ticular, for the important safety parts that are marked z on safety performance will be preserved. Parts with safety
wiring diagrams and parts lists, be sure to use the desig- properties are indicated as shown below on the wiring dia-
nated parts. grams and parts lists is this service manual. Be sure to re-
place them with parts with the designated part number.
(1) Schematic diagrams ... Indicated by the z mark.
For safety reasons, some parts use tape, tubes or other in- (2) Parts lists ... Indicated by the z mark.
sulating materials, and some parts are mounted away from
Using parts other than the designated
the surface of printed circuit boards. Care is also taken with
parts could result in electric shock, fires or
the positions of the wires inside and clamps are used to
other dangerous situations.
keep wires away from heating and high voltage parts, so
be sure to set everything back as it was originally.
2
AVR-1908 / AVR-788
z
z
z
3
AVR-1908 / AVR-788
DIMENSION
AVR-1908 model
21.2
335.2
382.9
214.5
54.7
26.5
155.0
171.0
344.0
16.0
434.0
4
AVR-1908 / AVR-788
AVR-788 model
21.2
377.1
335.2
214.5
54.7
20.7
155.0
171.0
344.0
16.0
434.0
5
AVR-1908 / AVR-788
CAUTION IN SERVICING
Initializing AV SURROUND RECEIVER/AM-
PLIFIER
AV SURROUND RECEIVER/AMPLIFIER initialization should
be performed when the