Pioneer HTV-A1 Service Manual

AMPLIFIER

HTV-A1

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

ORDER NO.

RRV1957

Type

KUCXJ AC120V

The HTV-A1 is a part of the Powered Subwoofer HTV-SW1. The Powered Subwoofer HTV-SW1 is a
part of the Hometheater System HTV-1.

Hometheater System Control Center
HTV-1 HTV-C1 (service manual RRV1960)
(service manual RRV1968)

This product does not operate normally by itself. Please connect it to the Control Center HTV-C1
for operating inspection. If operation confirmation for the unit by itself can not be avoided, refer to
“7.2 DIAGNOSIS”.

Model

HTV-A1

Power Requirement

Powered Subwoofer
HTV-SW1 (service manual RRV1969)

Amplifier
HTV-A1 (this service manual)

Remarks

CONTENTS

1. SAFETY INFORMATION....................................2

2. EXPLODED VIEWS AND PARTS LIST .............4

3. SCHEMATIC DIAGRAM..................................... 6

4. PCB CONNECTION DIAGRAM .......................14

5. PCB PARTS LIST.............................................20

6. ADJUSTMENT.................................................. 22

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V . Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 501 Orchard Road, #10-00 Wheelock Place, Singapore 238880

PIONEER ELECTRONIC CORPORATION 1998

7. GENERAL INFORMATION .............................. 22

7.1 IC ................................................................ 22

7.2 DIAGNOSIS................................................24

7.3 BLOCK DIAGRAM...................................... 26

8. PANEL FACILITIES AND SPECIFICATIONS

....................................................................28

T–DZE MAY 1998 Printed in Japan

HTV-A1

1. SAFETY INFORMATION

This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trained to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.

WARNING
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which
may cause birth defects or other reproductive harm (California Health & Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with
the solder. Also, when soldering do not inhale any smoke or fumes produced.

NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement parts
must be of identical designation.

REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que les
pièces de remplacement doivent avoir la même désignation.

(FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

The following check should be performed for the

continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage
current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed

metal parts of the appliance (input/output terminals,
screwheads, metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120V
AC 60 Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5 mA.

Reading should
not be above

0.5 mA

Earth ground

Device
under
test

Also test with plug
reversed
(Using AC adapter
plug as required)

Leakage

current

tester

Test all exposed
metal surfaces

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A PO­TENTIAL SHOCK HAZARD AND MUST BE COR­RECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appli­ance have special safety related characteristics. These
are often not evident from visual inspection nor the
protection afforded by them necessarily can be ob­tained by using replacement components rated for
voltage, wattage , etc. Replacement parts which have
these special safety characteristics are identified in
this Service Manual.
Electrical components having such features are
identified by marking with a
on the parts list in this Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
PIONEER recommended replacement one, shown in
the parts list in this Service Manual, may create shock,
fire, or other hazards.
Product Safety is continuously under review and
new instructions are issued from time to time. For
the latest information, always consult the current
PIONEER Service Manual. A subscription to, or ad­ditional copies of, PIONEER Service Manual may be
obtained at a nominal charge from PIONEER.

on the schematics and

2

HTV-A1

3

HTV-A1

2. EXPLODED VIEWS AND PARTS LIST

EXTERIOR

23

23

23

20

23

19

23

16

16

23

23

23

26

23

9

24

2

9

21

18

18

D

C

23

23

14

B

A

5

11

23

22

23

7

22

12

18

15

25

3

13

4

15

17

1

9

8

23

D

C

6

A

B

10

4

NOTES : Parts marked by “ NSP ” are generally unavailable because they are not in our Master Spare Parts List.

The mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
Screw adjacent to mark on the product are used for disassembly.

EXTERIOR PARTS LIST

Mark No. Description Part No.

1 AFPS ASSY AWU7073
2 PAMP ASSY AWU7074
3 PT PRI ASSY AWU7075
4 PT SEC ASSY AWU7076
5 JACK ASSY AWU7077

6 Power Transformer (T1) ATS7212
7 Fuse (5A, FU1) REK1083
8 AC Power Cord PDG1057
9 Push Rivet AEC7149

NSP 10 Chassis ANA7076

NSP 11 Heat Sink ANH7076

12 Binder ZCA-SKB90BK
13 Barrier AEC7135
14 Heat Protector AEC7136
15 Mini Card Spacer AEC7143

HTV-A1

16 Mica Sheet AEE7010
17 Strain Relief CM-22C

NSP 18 PCB Holder PNW2174

19 Bonnet Case AZN7709
20 65 Label ORW1069

21 Screw ABA-258
22 Screw ASZ40P060FMC
23 Screw BBZ30P080FMC
24 Cushion AEB7123
25 Screw IBZ30P080FMC

NSP 26 Name Label AAX7637

5

1

HTV-A1

3. SCHEMATIC DIAGRAM

3.1 OVERALL CONNECTIONS

A

B

23

PAMP ASSY

D

(AWU7074)

4

E

JACK ASSY

(AWU7077)

C

D

AFPS ASSY

A

(AWU7073)

6

1234

5

678

HTV-A1

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and P AR TS LIST" or "PCB PAR TS LIST".

A

B

B

PT SEC ASSY

(AWU7076)

AC 120V

60 Hz

AC POWER CORD
PDG1057

T1
POWER TRANSFORMER
ATS7212

C

C

PT PRI ASSY

(AWU7075)

D

7

5

6

7

8

1

•

23

HTV-A1

3.2 AFPS, PT SEC AND PT PRI ASSEMBLIES

4

SIGNAL ROUTE

: AUDIO SIGNAL (L ch)
: AUDIO SIGNAL (SW ch)

A

BALANCED IN

E-VOLUME & TONE CONTROL, SUBWOOFER LEVEL

E

CN1105

1

2

+9.0

B

+4.5

(VREF)

I / O EXPANDER

Q1003, Q1004 :

AC RELAY DRIVER

0.0

3

+0.7

0.0

C

0.0

0.0

LPF 180Hz

L / R MIX

D

IC8001 (BU2092F)

No.

Pin Name

1 GNDD 0.0 V 0.0 V 0.0 V
2 DATA 5.0 V 5.0 V 5.0 V
3 CLK 0.0 V 0.0 V 0.0 V
4 LCK 0.0 V 0.0 V 0.0 V
5 PWON 5.1 V 0.0 V 0.0 V
6 SPRY 4.7 V 0.0 V 0.0 V
7 ACRY 5.1 V 0.0 V 0.0 V

8 MUTE 0.0 V 5.1 V 0.0 V
17 OE 0.0 V 0.0 V 0.0 V
18 VDD 5.1 V 5.1 V 5.1 V

STAND BY

ON MUTE

8

A

1234

5

CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE NO. 4911.25 MFD, BY
LITTELFUSE INK. FOR IC101 AND IC102(AEK7010).

CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE NO. 491001 MFD, BY
LITTELFUSE INK. FOR IC103(AEK7009).

678

CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE NO. 491010 MFD, BY
LITTELFUSE INK. FOR IC110 AND IC111(AEK7022).

CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE NO. 491.250 MFD, BY
LITTELFUSE INK. FOR IC121 AND IC122(AEK7002).

HTV-A1

L

BUFFER AMP

HPF 180Hz

AFPS ASSY

A

(AWU7073)

A

D

CN1101

40Hz +9.5dB

HPF

D

CN1102

B

0.0

4700/63 ACH7007

ACH7007

4700/63

–17.9

+35.1

Q1001, Q1002 :

PROTECTION (SPEAKER)

RELAY DRIVER

+44.1

+35.1

–44.1

+17.7

B

T 1 : POWER TRANSFORMER

ATS7212

AC POWER CORD
PDG1057

5A/125V

FU 1 : REK1083

C

AC 120V
60 Hz

E

CN1104

C

D

POWER SUPPLY

• NOTE FOR FUSE REPLACEMENT

CAUTION -

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE WITH SAME TYPE AND RATINGS ONLY.

5

PT SEC ASSY

(AWU7076)

6

7

PT PRI ASSY

(AWU7075)

A

B C

9

8