Denon DVM-1845/745 User manual

Denon Brand Company, D&M Holdings lnc.
e
●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.
注 意
サービスをおこなう前に、このサービスマニュアルを
必ずお読みください。本機は、火災、感電、けがなど
に対する安全性を確保するために、さまざまな配慮を
おこなっており、また法的には「電気用品安全法」に
もとづき、所定の許可を得て製造されております。
従ってサービスをおこなう際は、これらの安全性が維
持されるよう、このサービスマニュアルに記載されて
いる注意事項を必ずお守りください。
●本機の仕様は性能改良のため、予告なく変更すること
があります。
●補修用性能部品の保有期間は、製造打切後 8 年です。
●修理の際は、必ず取扱説明書を参照の上、作業を行っ
てください。
●本文中に使用しているイラストは、説明の都合上現物
と多少異なる場合があります。
X0336V.02 DE/CDM 0802
SERVICE MANUAL
DVD VIDEO AUTO CHANGER
MODEL JP E3 E2 EK E2A E1C E1K EUT
DVM-1845/745
3
Ver. 2
Please refer to the
MODIFICATION NOTICE.

2
DVM-1845/745
Please heed the points listed below during servicing and inspection.
◎Heed the cautions!
Spots requiring particular attention when servicing, such as
the cabinet, parts, chassis, etc., have cautions indicated on
labels or seals. Be sure to heed these cautions and the cau-
tions indicated in the handling instructions.
◎Caution concerning electric shock!
(1) An AC voltage is impressed on this set, so touching inter-
nal metal parts when the set is energized could cause
electric shock. Take care to avoid electric shock, by for ex-
ample using an isolating transformer and gloves when
servicing while the set is energized, unplugging the power
cord when replacing parts, etc.
(2)There are high voltage parts inside. Handle with extra care
when the set is energized.
◎ Caution concerning disassembly and assembly!
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 moved
across them. Use gloves to protect your hands.
◎Only use designated parts!
The set's parts have specific safety properties (fire resis-
tance, voltage resistance, etc.). For replacement parts, be
sure to use parts which have the same properties. In particu-
lar, for the important safety parts that are marked ! on wiring
diagrams and parts lists, be sure to use the designated parts.
◎Be sure to mount parts and arrange the
wires as they were originally!
For safety reasons, some parts use tape, tubes or other insu-
lating materials, and some parts are mounted away from the
surface of printed circuit boards. Care is also taken with the
positions of the wires inside and clamps are used to keep
wires away from heating and high voltage parts, so be sure to
set everything back as it was originally.
◎Inspect for safety after servicing!
Check that all screws, parts and wires removed or discon-
nected for servicing have been put back in their original posi-
tions, inspect that no parts around the area that has been
serviced have been negatively affected, conduct an insulation
check on the external metal connectors and between the
blades of the power plug, and otherwise check that safety is
ensured.
(Insulation check procedure)
Unplug the power cord from the power outlet, disconnect the
antenna, plugs, etc., and turn the power switch on. Using a
500V insulation resistance tester, check that the insulation re-
sistance between the terminals of the power plug and the ex-
ternally exposed metal parts (antenna terminal, headphones
terminal, microphone terminal, input terminal, etc.) is 1MΩor
greater. If it is less, the set must be inspected and repaired.
Concerning important safety parts
Many of the electric and structural parts used in the set have
special safety properties. In most cases these properties are
difficult to distinguish by sight, and using replacement parts
with higher ratings (rated power and withstand voltage) does
not necessarily guarantee that safety performance will be pre-
served. Parts with safety properties are indicated as shown
below on the wiring diagrams and parts lists is this service
manual. Be sure to replace them with parts with the designat-
ed part number.
(1) Schematic diagrams ... Indicated by the ! mark.
(2) Parts lists ... Indicated by the ! mark.
Using parts other than the designated parts
could result in electric shock, fires or other
dangerous situations.
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.
LASER RADIATION
Caution - Class 1M visible and invisible laser radiation when open.
Do not view directly with optical instruments.
CAUTION
CAUTION
サービス、点検時にはつぎのことにご注意願います。
◎注意事項をお守りください！
サービスのとき特に注意を必要とする個所についてはキャ
ビネット、部品、シャーシなどにラベルや捺印で注意事項を
表示しています。これらの注意書きおよび取扱説明書などの
注意事項を必ずお守りください。
◎感電に注意！
(1) このセットは、交流電圧が印加されていますので通電時
に内部金属部に触れると感電することがあります。従っ
て通電サービス時には、絶縁トランスの使用や手袋の着
用、部品交換には、電源プラグを抜くなどして感電にご
注意ください。
(2) 内部には高電圧の部分がありますので、通電時の取扱に
は十分ご注意ください。
◎分解、組み立て作業時のご注意！
板金部品の端面の『バリ』は、部品製造時に充分管理をして
おりますが、板金端面は鋭利となっている箇所が有りますの
で、部品端面に触れたまま指を動かすとまれに怪我をする場
合がありますので十分注意して作業して下さい。手の保護の
ために手袋を着用してください。
◎指定部品の使用！
セットの部品は難燃性や耐電圧など安全上の特性を持った
ものとなっています。従って交換部品は、使用されていたも
のと同じ特性の部品を使用してください。特に配線図、部品
表に!印で指定されている安全上重要な部品は必ず指定の
ものをご使用ください。
◎部品の取付けや配線の引きまわしは、
元どおりに！
安全上、テープやチューブなどの絶縁材料を使用したり、プ
リント基板から浮かして取付けた部品があります。また内部
配線は引きまわしやクランパーによって発熱部品や高圧部
品に接近しないように配慮されていますので、これらは必ず
元どおりにしてください。
◎サービス後は安全点検を！
サービスのために取り外したねじ、部品、配線などが元どお
りになっているか、またサービスした個所の周辺を劣化させ
てしまったところがないかなどを点検し、外部金属端子部
と、電源プラグの刃の間の絶縁チェックをおこなうなど、安
全性が確保されていることを確認してください。
（絶縁チェックの方法）
電源コンセントから電源プラグを抜き、アンテナやプラグな
どを外し、電源スイッチを入れます。500V 絶縁抵抗計を用
いて、電源プラグのそれぞれの端子と外部露出金属部［アン
テナ端子、ヘッドホン端子、マイク端子、入力端子など］と
の間で、絶縁抵抗値が１ MΩ 以上であることを確認してく
ださい。この値以下のときはセットの点検修理が必要です。
安全上重要な部品について
本機に使用している多くの電気部品、および機構部品は安全
上、特別な特性を持っています。この特性はほとんどの場合、
外観では判別つきにくく、またもとの部品より高い定格（定
格電力、耐圧）を持ったものを使用しても安全性が維持され
るとは、限りません。安全上の特性を持った部品は、この
サービスマニュアルの配線図、部品表につぎのように表示し
ていますので必ず指定されている部品番号のものを使用願
います。
(1) 配線図…!マークで表示しています。
(2) 部品表…!マークで表示しています。
指定された部品と異なるものを使用した場合に
は、感電、火災などの危険を生じる恐れがあり
ます。
注 意
注 意

3
DVM-1845/745
SPECIFICATIONS
Notes:
1. All Items are measured without pre-emphasis unless otherwise specified.
2. Power supply: AC 120 V, 60 Hz
3. Load Impedance: 100 k load (Audio Output)
4. Room Ambient: 5 °C - 40 °C
Item Conditions Unit Nominal Limit
1. Video Output 75 load Vpp 1.0 ± 0.1
2. Optical Digital Out dBm -18
3. Audio (PCM)
3-1. Output Level 1 kHz, 0 dB Vrms 2.0
3-2. S/N dB 120
3-3. Freq. Response
DVD fs = 48 kHz, 20 Hz ~ 22 kHz dB ± 1.0
CD fs = 44.1 kHz, 20 Hz ~ 20 kHz dB ± 1.0
3-4. THD+N
DVD 1 kHz, 0 dB % 0.004
CD 1 kHz, 0 dB % 0.004

4
DVM-1845/745
Safety Check after Servicing
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, and
wires have been returned to their original positions. Afterwards, do the following tests and confirm the specified
values to verify compliance with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d’) between
soldered terminals, and between terminals and
surrounding metallic parts. (See Fig. 1)
Table 1: Ratings for selected area
Note: This table is unofficial and for reference only. Be
sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current
between B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals,
antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.) is
lower than or equal to the specified value in the table
below.
Measuring Method (Power ON):
Insert load Z between B (earth ground, power cord plug
prongs) and exposed accessible parts. Use an AC
voltmeter to measure across the terminals of load Z.
See Fig. 2 and the following table.
Table 2: Leakage current ratings for selected areas
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
AC Line Voltage Clearance Distance (d), (d’)
120 V ≥3.2 mm (0.126 inches)
AC Line Voltage Load Z Leakage Current (i) Earth Ground (B) to:
120 V 0.15 µF CAP. & 1.5 kΩRES.
Connected in parallel i≤0.5 mA Peak Exposed accessible parts
Chassis or Secondary Conductor
Primary Circuit
Fig. 1
d' d
AC Voltmeter
(High Impedance)
Exposed Accessible Part
BEarth Ground
Power Cord Plug Prongs
Z
Fig. 2

5
DVM-1845/745
STANDARD NOTES FOR SERVICING
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is
indicated as shown.
2. For other ICs, pin 1 and every fifth pin are
indicated as shown.
3. The 1st pin of every male connector is indicated as
shown.
Instructions for Connectors
1. When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect
the AC cord.
2. FFC (Flexible Foil Connector) cable should be
inserted parallel into the connector, not at an
angle.
Pb (Lead) Free Solder
When soldering, be sure to use the Pb free solder.
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
1. Prepare the hot-air flat pack-IC desoldering
machine, then apply hot air to the Flat Pack-IC
(about 5 to 6 seconds). (Fig. S-1-1)
2. Remove the flat pack-IC with tweezers while
applying the hot air.
3. Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
4. Release the flat pack-IC from the CBA using
tweezers. (Fig. S-1-6)
CAUTION:
1. The Flat Pack-IC shape may differ by models. Use
an appropriate hot-air flat pack-IC desoldering
machine, whose shape matches that of the Flat
Pack-IC.
2. Do not supply hot air to the chip parts around the
flat pack-IC for over 6 seconds because damage
to the chip parts may occur. Put masking tape
around the flat pack-IC to protect other parts from
damage. (Fig. S-1-2)
Top View
Out In
Bottom View
Input
5
10
Pin 1
Pin 1
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Fig. S-1-1

6
DVM-1845/745
3. The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when
removing it.
With Soldering Iron:
1. Using desoldering braid, remove the solder from
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
2. Lift each lead of the flat pack-IC upward one by
one, using a sharp pin or wire to which solder will
not adhere (iron wire). When heating the pins, use
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
3. Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
4. Release the flat pack-IC from the CBA using
tweezers. (Fig. S-1-6)
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape
Fig. S-1-2
Flat Pack-IC Desoldering Braid
Soldering Iron
Fig. S-1-3
Fine Tip
Soldering Iron
Sharp
Pin
Fig. S-1-4

7
DVM-1845/745
With Iron Wire:
1. Using desoldering braid, remove the solder from
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
2. Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
3. While heating the pins using a fine tip soldering
iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA
contact pads as shown in Fig. S-1-5.
4. Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
5. Release the flat pack-IC from the CBA using
tweezers. (Fig. S-1-6)
Note: When using a soldering iron, care must be
taken to ensure that the flat pack-IC is not
being held by glue. When the flat pack-IC is
removed from the CBA, handle it gently
because it may be damaged if force is applied.
2. Installation
1. Using desoldering braid, remove the solder from
the foil of each pin of the flat pack-IC on the CBA
so you can install a replacement flat pack-IC more
easily.
2. The “●” mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
presolder the four corners of the flat pack-IC. (See
Fig. S-1-8.)
3. Solder all pins of the flat pack-IC. Be sure that
none of the pins have solder bridges.
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
Fig. S-1-5
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers
Fig. S-1-6
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark. Fig. S-1-7
Presolder
CBA
Flat Pack-IC
Fig. S-1-8

8
DVM-1845/745
Instructions for Handling Semi-
conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by
electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1 MΩ) that is
properly grounded to remove any static electricity that
may be charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate
with proper grounding (1 MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on
clothing will not escape through the body grounding
band, be careful to avoid contacting semi-conductors
with your clothing.
<Incorrect>
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1MΩ
1MΩ
<Correct>
CBA

9
DVM-1845/745
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps to gain
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and
dress the cables as they were originally.
2. Disassembly Method (1): Identification (location) No. of parts in the figures
(2): Name of the part
(3): Figure Number for reference
(4): Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P=Spring, L=Locking Tab, S=Screw,CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5): Refer to “Reference Notes.”
ID/
LOC.
No.
PART
REMOVAL
Fig.
No.
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
Note
[1] Top Cover D1 6(S-1) -
[2] Front
Assembly D2 *8(L-1) 1
[3] Bracket
(Top) D3 2(S-2) -
[4]
Stopper
Bracket
L, R
D3 4(S-3) -
[5] Slide Tray
Assembly
D4
D5 CN5001, CN5004 2
3
4
[6] Function CBA D4 *2(L-2), CN2201 -
[1] Top Cover
[2] Front Assembly
[3] Bracket (Top)
[4] Stopper Bracket L, R
[5] Slide Tray
Assembly
[10] Tray Guide
(R) Unit
[19] DVD Main
CBA Unit
[17] Changer CBA
[18] AV CBA
[20] PCB Holder
[11] Loading
Pulley
[12] Slide Tray
Gear (B)
[13] Slide Tray
Gear (A)
[14] Motor
Assembly
[15] Switch CBA
[16] Tray
Guide (R)
[7] Power
Switch CBA
[8] Rear Panel [9] Tray
Guide (L)
[6] Function CBA
[7] Power Switch
CBA D4 CN2103, (S-4) -
[8] Rear Panel D6 4(S-5), 11(S-6), (S-7) -
[9] Tray
Guide (L) D7 (S-8) -
[10]
Tray
Guide (R)
Unit
D7 2(S-9), CN3003,
CN3004 -
[11] Loading
Pulley D8 (S-10), Belt L -
[12] Slide Tray
Gear (B) D8 (S-11), *(P-1) -
[13] Slide Tray
Gear (A) D8 ---------- -
[14] Motor
Assembly D8 (S-12) -
[15] Switch
CBA D8 *2(L-4) -
[16] Tray
Guide (R) D8 ---------- -
[17] Changer CBA D9 CN3102, CN3301,
2(S-13) -
[18 AV CBA D9 5(S-14), CN1001,
CN1601 -
[19] DVD Main
CBA Unit D10 3(S-15) -
[20] PCB Holder D10 ---------- -
↓
(1) ↓ (2) ↓ (3) ↓ (4) ↓ (5)
ID/
LOC.
No.
PART
REMOVAL
Fig.
No.
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
Note

10
DVM-1845/745
Reference Notes
CAUTION 1: Locking Tabs (L-1) are fragile. Be careful
not to break them.
1-1. To release eight Locking Tabs (L-1), first release
five Locking Tabs (A), and then three Locking
Tabs (B). (Fig. D2)
CAUTION 2: Electrostatic breakdown of the laser
diode in the optical system block may occur as a
potential difference caused by electrostatic charge
accumulated on cloth, human body etc., during
unpacking or repair work.
To avoid damage of pickup follow next procedures.
2-1. To remove the Chuck Arm, remove the Screw A,
two Rotary Tray Washers and Rotary Tray
Spring. (Fig. D5)
2-2. Short the three short lands of FPC cable with sol-
der before removing the FFC cable (CN5004 on
the Relay CBA). If you disconnect the FFC cable
without shorting them, the laser diode of pickup
will be destroyed. (Fig. D5)
2-3. Disconnect the Connector (CN5001). Remove
the Slide Tray Assembly carefully. (Fig. D5)
CAUTION 3: When reassembling, confirm the three
short lands of FPC cable is solderd, and connect the
FFC cable (CN5004 on the Relay CBA) completely.
Then remove the solder from the three short lands of
FPC cable. (Fig. D5)
CAUTION 4: Before reinstalling, turn the Slide Tray
Gear (B) fully clockwise. (Fig. D4)
(S-1)
(S-1)
(S-1)
[1] Top Cover
(S-1)
Fig. D1
[2] Front Assembly (L-1)
(A)
(B)
(B)
(L-1)
(L-1)
(L-1)
(L-1)
Fig. D2
[3] Bracket (Top)
[4] Stopper Bracket R
[4] Stopper Bracket L
(S-3)
(S-2)
(S-2) (S-3)
(S-3)
Fig. D3

11
DVM-1845/745
Slide Tray
Gear (B)
CN2201
[6] Function CBA
(L-2)
(L-2)
(S-4)
[7] Power
Switch CBA
CN2103
[5] Slide Tray
Assembly
Turn
Fig. D4
Slide Tray
Assembly
Screw A
Rotary tray washer
Rotary tray washer
B
Chuck arm
View for A
Short the three short lands by soldering.
(Either of two places.)
FPC Cable
A
Rotary tray spring
Relay CBA
CN5001
CN5004
FFC cable from
the DVD Main
CBA Unit FFC cable from
the Changer CBA
View for B (Relay CBA)
Fig. D5

12
DVM-1845/745
(S-5)
(S-5)
(S-5)
(S-5)
(S-6)
(S-6)
(S-6)
(S-7)
[8] Rear Panel
Fig. D6
(S-8)
[10] Tray Guide
(R) Unit
[9] Tray Guide (L)
CN3004
CN3003
(S-9)
Fig. D7
(S-10)
Belt L
[11] Loading
Pulley
[12] Slide Tray Gear (B)
[14] Motor Assembly
[15] Switch
CBA
(S-12)
(L-4)
[13] Slide Tray Gear (A)
[16] Tray
Guide (R)
(P-1)
(S-11)
Fig. D8
CN3102
CN3301 CN1001
CN1601
[17] Changer CBA
(S-13)
(S-13)
[18] AV CBA
(S-14)
(S-14)
Fig. D9

13
DVM-1845/745
(S-15)
[20] PCB Holder
[19]
DVD Main
CBA Unit
Fig. D10

14
DVM-1845/745
SLIDE TRAY ASSEMBLY DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps to gain access to item(s) to be serviced. When Reassembly, follow
the steps in reverse order. Bend, route, and dress the cables as they were originally.
[3] Plate Holder 2
[4] Plate Holder 3
[5] Plate Spring
[6] Belt L [7] Gear Plate
[8] Mecha Cable
[9] Detector Switch [10] Rotary Motor Assembly
[11] Relay CBA + Sensor CBA
[12] Slot Lever
[13] Rotary Stopper
[14] Mecha Holder Assembly
[15] Motion Gear
[16] Loading Pulley
[17] Rotary Tray Gear
[18] Idler Gear
[19] Idler Pad
[20] Idler Arm
[21] Slide Tray Chassis
[1] Chuck Arm
[2] Rotary Tray

15
DVM-1845/745
2. Disassembly Method
(1): Identification (location) No. of parts in the figures
(2): Name of the part
(3): Figure Number for reference
(4): Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P=Spring, L=Locking Tab, S=Screw, CN=Connector,
W=Washer
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5): Refer to “Reference Notes.”
Reference Notes
1. Disassembly note
Slide the Rotary Tray slowly in the direction of the
front while rotating it.
2. Reassembly note
Align the rails on the Rotary Tray with the slot on
the sensor and align pin A with hole A on the
Rotary Tray.
3. Reassembly note
Re-solder the leads on the Rotary Motor Assembly
or the Detector Switch as shown in Fig. MD4.
4. CAUTION: Electrostatic breakdown of the laser
diode in the optical system block may occur as a
potential difference caused by electrostatic charge
accumulated on cloth, human body, etc., during
unpacking or repair work.
To avoid damage of pickup:
a. Short the three short lands of the FPC cable
with solder before removing the FFC cable
(CN5005). If you disconnect the FFC cable
(CN5005) without shorting them, the laser diode
of the pickup will be destroyed. (“View for A” in
Fig. MD5)
b. Disconnect the two connectors (CN5003 and
CN5005) on the Relay CBA.
5. CAUTION: When Reassembly, confirm the FFC
cable (CN5005) is connected completely. Then
remove the solder from the three short lands of the
FPC cable. (“View for A” in Fig. MD5)
6. Disassembly note
Remove the spring (P-2). Then remove the Slot
Lever with the Rotary Stopper while turning the
Slot Lever in the direction of the arrow as shown in
Fig. MD6.
7. Reassembly note
a. Install the Slot Lever and the Rotary Stopper
with spring (P-2) as shown in “Bottom View of
the Slide Tray” of Fig. MD6.
b. Align pin B on the Slot Lever with slot B on the
Motion Gear.
8. Disassembly note
The Mecha Holder Assembly and the Motion Gear
should be removed together.
9. Reassembly note
The pins, slots or holes on the Mecha Holder
Assembly, the Motion Gear and the Slide Tray align
as follows:
• Pin C on the Mecha Holder Assembly with hole B
on the Slide Tray Chassis
• Pin D on the Mecha Holder Assembly with slot C
on the Motion Gear
• Pin E on the Mecha Holder Assembly with
cavity A on the Slide Tray Chassis
• Slot A on the Mecha Holder Assembly with rib A
on the Slide Tray Chassis
ID/
LOC
.No.
PART
REMOVAL
Fig.
No.
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
Note
[1] Chuck Arm MD1 (S-1), 2(W-1), (P-1), Magnet, Yoke,
Clamper -
[2] Rotary Tray MD2 ---------- 1
2
[3] Plate Holder 2 MD3 2(S-2), (S-3) -
[4] Plate Holder 3 MD3 2(S-4) -
[5] Plate Spring MD4 (S-5) -
[6] Belt L MD4 ---------- -
[7] Gear Plate MD4 3(S-6), (S-7) -
[8] Mecha Cable MD4
6(L-1), *CN5002,
*CN5101, (S-8)
Lead clamper,
Desolder
-
[9] Detector
Switch MD4 Desolder 3
[10] Rotary Motor
Assembly MD4 Desolder 3
[11] Relay CBA +
Sensor CBA MD5 4(S-9), *CN5003, *CN5005 4 5
[12] Slot Lever MD6 *(P-2) 6
7
[13] Rotary
Stopper MD6 ---------- 6 7
[14] Mecha Holder
Assembly MD5 MD6 ----------
4
5
8
9
[15] Motion Gear MD6 ---------- 8
9
[16] Loading
Pulley MD7 (S-10), (W-2) -
[17] Rotary Tray
Gear MD7 ---------- -
[18] Idler Gear MD7 *(P-3), (S-11), (W-3),
(W-4) -
[19] Idler Pad MD7 ---------- -
[20] Idler Arm MD7 ---------- -
[21] Slide Tray
Chassis MD7 ---------- -
↓
(1) ↓ (2) ↓ (3) ↓ (4) ↓ (5)

16
DVM-1845/745
(W-1)
(W-1)
(S-1)
(P-1) Clamper
Magnet
Yoke
[1] Chuck Arm
Fig. MD1
1
2
Pin A
Hole A
Rails on the Rotary Tray
Slot on
the sensor
[2] Rotary Tray
Fig. MD2
[3] Plate
Holder 2
[4] Plate
Holder 3
(S-2) (S-3)
(S-4)
(S-4)
Fig. MD3
[8] Mecha Cable
[8] Mecha
Cable
[9] Detector
Switch
Detector Switch DC Mini Motor
[10] Rotary Motor
Assembly
[6] Belt L [7] Gear Plate
[5] Plate Spring
Bottom View of the Slide Tray
(S-6)
(S-8) Lead
clamper
(S-7)
(S-5)
(L-1)
(L-1)
CN5002
CN5101
yellow
black
blue
red
brown
(L-1)
(S-6)
Desolder
Desolder
Slide Tray
(S-6)
Fig. MD4

17
DVM-1845/745
[11] Relay CBA + Sensor CBA
Bottom View of the Slide Tray
Slide Tray
View for A
Short the three short lands by soldering.
(Either of two places.)
FPC Cable
A
(S-9) (S-9)
CN5003CN5005
Fig. MD5
Fig. MD6
Pin E
Pin C
Pin B
turn (P-2)
Pin C
Pin E
Pin D
Pin D
Slot C
Slot B
Slot A
Slot A
Slide Tray
[15] Motion
Gear
[12] Slot
Lever
[13] Rotary
Stopper
[12] Slot Lever
[13] Rotary Stopper
(P-2)
Bottom View of the Slide Tray
Bottom View of the Mecha Holder Assembly
Rib A Cavity A
Hole B
[14] Mecha Holder Assembly

18
DVM-1845/745
Fig. MD7
(P-3)
(W-3) (W-2)
(W-4)
(S-11)
(S-10)
[17] Rotary
Tray Gear
[20] Idler
Arm
[19] Idler
Pad
[18] Idler
Gear [16] Loading
Pulley
[21] Slide Tray Chassis

19
DVM-1845/745
FLOW CHART NO.2
The fuse blows out.
After servicing, replace the fuse.
Check the presence that the primary component
is leaking or shorted and service it if defective.
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
FLOW CHART NO.3
When the output voltage fluctuates.
Yes
No
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of AV circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side ,
and service it if defective.
(D1003, D1006, D1008, D1016, D1030, Q1002, Q1004, Q1011, Q1014, Q1020, Q1022)
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1001, D1012, D1024 and their periphery,
and service it if defective.
Check IC1001, IC1006 and their
periphery, and service it if defective.
FLOW CHART NO.5
-FL is not outputted.
Is -24V voltage supplied to the anode of D1003? Check D1003 and periphery circuit, and service it
if defective.
Check if there is any leak or short-circuit
on the loaded circuit, and service it if defective.
Yes
No
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the CHG +3.3V line voltage normal?
Is each voltage of the secondary side normal?
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or shor-circuiting on the
primary circuit component, and service it if defective.
(Q1031, Q1003, T1001, D1001, D1002, D1004,
D1005, D1011, C1003, C1005)
Check each rectifying circuit of the secondary circuit
and service it if defective.
Yes
Yes
Yes
Is the voltage of 3.3V supplied to pin(1) of IC3001?
Yes
When pressing POWER button (SW2101), is the
voltage of 0V supplied to pin(42) of IC3001?
Yes
Replace IC3001.
Yes
No
No
No
No
Check POWER button (SW2101) and their
periphery, and service it if defective.
No
Check CHG+3.3V line and service it if defective.
See FLOW CHART No.2 <The fuse blows out.>
No
FLOW CHART NO.2
The fuse blows out.
After servicing, replace the fuse.
Check the presence that the primary component
is leaking or shorted and service it if defective.
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
FLOW CHART NO.3
When the output voltage fluctuates.
Yes
No
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of AV circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side ,
and service it if defective.
(D1003, D1006, D1008, D1016, D1030, Q1002, Q1004, Q1011, Q1014, Q1020, Q1022)
Does the photo coupler circuit on the secondary
side operate normally?
Check IC1001, D1012, D1024 and their periphery,
and service it if defective.
Check IC1001, IC1006 and their
periphery, and service it if defective.
FLOW CHART NO.5
-FL is not outputted.
Is -24V voltage supplied to the anode of D1003? Check D1003 and periphery circuit, and service it
if defective.
Check if there is any leak or short-circuit
on the loaded circuit, and service it if defective.
Yes
No
FLOW CHART NO.1
The power cannot be turned on.
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the CHG +3.3V line voltage normal?
Is each voltage of the secondary side normal?
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or shor-circuiting on the
primary circuit component, and service it if defective.
(Q1031, Q1003, T1001, D1001, D1002, D1004,
D1005, D1011, C1003, C1005)
Check each rectifying circuit of the secondary circuit
and service it if defective.
Yes
Yes
Yes
Is the voltage of 3.3V supplied to pin(1) of IC3001?
Yes
When pressing POWER button (SW2101), is the
voltage of 0V supplied to pin(42) of IC3001?
Yes
Replace IC3001.
Yes
No
No
No
No
Check POWER button (SW2101) and their
periphery, and service it if defective.
No
Check CHG+3.3V line and service it if defective.
See FLOW CHART No.2 <The fuse blows out.>
No
TROUBLESHOOTING

20
DVM-1845/745
FLOW CHART NO.7
P-ON+5V is not outputted. (P-ON+10V is outputted normally.)
Is the "H" signal inputted into the base of Q1004?
Replace Q1004.
Check R1068 and D1046 and service it if defective.
Yes
No
FLOW CHART NO.8
P-ON+3.3V is not outputted. (P-ON+10V is outputted normally.)
Is 3.3V voltage supplied to the collector of Q1011?
Replace Q1011, R1066 and R1067.
Check D1008, C1007, C1038, L1007 and
the periphery circuit, and service it if defective.
Yes
No
FLOW CHART NO.9
CHG+5V is not outputted.
Is EV+10V outputted normally?
Check Q1014, D1047 and the periphery circuit,
and service it if defective.
Refer to "FLOW CHART NO.6"
<P-ON+10V (EV+10V) is not outputted.>
Yes
No
FLOW CHART NO.6
P-ON+10V (EV+10V) is not outputted.
Is 10V voltage supplied to the emitter of Q1002?
Is the voltage of base on Q1002 lower than the
voltage of emitter on Q1002 when turning the power on?
Replace Q1002.
Check D1030, C1035, C1048, L1009 and
the periphery circuit, and service it if defective.
Check Q1016 and service it if defective.
Yes
Yes
No
No
FLOW CHART NO.10
EV+1.2V is not outputted.
Is 3.3V voltage supplied to Pin(3) of IC1003?
Replace IC1003.
Check D1006, C1014, C1050, L1008, Q1022 and
the periphery circuit, and service it if defective.
Yes
No
FLOW CHART NO.11
EV+3.3V is not outputted.
Is 3.3V voltage supplied to emitter of Q1020?
Is the "L" signal inputted to base of Q1012?
Check Q1012, Q1020, R1050, R1088 and
service it if defective.
Replace IC3001.
Check the circuit between Pin(9)
of IC3001 and base of Q1012
and service it if defective.
Check D1008, C1007, C1038, L1007 and
the periphery circuit, and service it if defective.
Is the "L" signal outputted into Pin(9) of IC3001?
Yes
Yes Yes No
No
No