Nad HTR-1 Service Manual

Service Information HTR-1

Service Tip

Problem: Poor response of AV Receiver to remote commands.

Cause: Mismatch of IR frequency between Remote and Receiver.

Affected Models: Some T760, T751, T761; not all units are affected.

Solution: Change HTR-1 IR transmission frequency.

Order part number: HTR-1 service kit

NOTE: The HTR-1 service kit contains: HTR-1 Service Tip Document, 9.8304 MHz

crystal, and 2 pcs. 22pF capacitor - SMD type 0805 series. These are common parts
that may also be readily available locally.

1. Open the case of the HTR-1 by using only a thin but strong plastic
screwdriver or similar tool (metallic tool will damage case). There are 5
tabs on each side of the remote that hold it together. Start at the top of
the remote on either the right or left side. Locate the slot that runs along
the side of the remote. By inserting and pressing the screwdriver down
on an angle towards the bottom part of the case the tab should release.
Work your way down the remote releasing the tabs and the case will
open up. See Diagram 1 for reference.

2. With the remote opened, locate X1, C2, and C3 . X1 is a ceramic
resonator type and should be replaced with a crystal 9.8304 MHz as
shown in Diagram 2. Capacitors C2 and C3 are now required for proper
operation. Install capacitors C2 and C3, 22pF (surface mount type 0805
series) as shown in diagram 2.

3. Hot glue X1 crystal to the PC board for stability. Reassemble.

4. Finally, test remote with receiver using the input functions as a

test(eg. CD, VIDEO1, VIDEO2 …etc.) .

Diagram 1

Service Information HTR-1

Service Tip

Diagram 2

Contact:
NAD Electronics International
633 Granite Court
Pickering, ON Canada L1K 3K1
Voice: 905-831-0799 FAX [phone]